Fix zero stake bug in the hiring module.

https://github.com/Joystream/joystream/issues/702

runtime-modules/content-working-group/src/lib.rs

@@ -836,7 +836,7 @@ impl rstd::convert::From<WrappedError<hiring::AddOpeningError>> for &str {
             hiring::AddOpeningError::OpeningMustActivateInTheFuture => {
                 MSG_ADD_CURATOR_OPENING_ACTIVATES_IN_THE_PAST
             }
-            hiring::AddOpeningError::StakeAmountLessThanMinimumCurrencyBalance(purpose) => {
+            hiring::AddOpeningError::StakeAmountLessThanMinimumStakeBalance(purpose) => {
                 match purpose {
                     hiring::StakePurpose::Role => {
                         MSG_ADD_CURATOR_OPENING_ROLE_STAKE_LESS_THAN_MINIMUM

runtime-modules/content-working-group/src/mock.rs

@@ -162,6 +162,9 @@ impl stake::Trait for Test {
     type SlashId = TestSlashId;
 }
 
+parameter_types! {
+    pub const MinimumStakeBalance: u64 = 1; // just non-zero
+}
 type TestOpeningId = u64;
 type TestApplicationId = u64;
 impl hiring::Trait for Test {
@@ -169,6 +172,7 @@ impl hiring::Trait for Test {
     type ApplicationId = TestApplicationId;
     type ApplicationDeactivatedHandler = ();
     type StakeHandlerProvider = hiring::Module<Self>;
+    type MinimumStakeBalance = MinimumStakeBalance;
 }
 
 impl versioned_store::Trait for Test {

runtime-modules/hiring/src/hiring/mod.rs

@@ -149,7 +149,7 @@ pub enum AddOpeningError {
 
     /// It is not possible to stake less than the minimum balance defined in the
     /// `Currency` module.
-    StakeAmountLessThanMinimumCurrencyBalance(StakePurpose),
+    StakeAmountLessThanMinimumStakeBalance(StakePurpose),
 
     /// It is not possible to provide application rationing policy with zero
     /// 'max_active_applicants' parameter.

runtime-modules/hiring/src/hiring/opening.rs

@@ -153,7 +153,7 @@ where
     pub(crate) fn ensure_can_add_opening(
         current_block_height: BlockNumber,
         activate_at: ActivateOpeningAt<BlockNumber>,
-        runtime_minimum_balance: Balance,
+        minimum_stake_balance: Balance,
         application_rationing_policy: Option<ApplicationRationingPolicy>,
         application_staking_policy: Option<StakingPolicy<Balance, BlockNumber>>,
         role_staking_policy: Option<StakingPolicy<Balance, BlockNumber>>,
@@ -177,15 +177,15 @@ where
         // Check that staking amounts clear minimum balance required.
         StakingPolicy::ensure_amount_valid_in_opt_staking_policy(
             application_staking_policy,
-            runtime_minimum_balance.clone(),
-            AddOpeningError::StakeAmountLessThanMinimumCurrencyBalance(StakePurpose::Application),
+            minimum_stake_balance.clone(),
+            AddOpeningError::StakeAmountLessThanMinimumStakeBalance(StakePurpose::Application),
         )?;
 
         // Check that staking amounts clear minimum balance required.
         StakingPolicy::ensure_amount_valid_in_opt_staking_policy(
             role_staking_policy,
-            runtime_minimum_balance,
-            AddOpeningError::StakeAmountLessThanMinimumCurrencyBalance(StakePurpose::Role),
+            minimum_stake_balance,
+            AddOpeningError::StakeAmountLessThanMinimumStakeBalance(StakePurpose::Role),
         )?;
 
         Ok(())

runtime-modules/hiring/src/hiring/staking_policy.rs

@@ -54,11 +54,11 @@ impl<Balance: PartialOrd + Clone, BlockNumber: Clone> StakingPolicy<Balance, Blo
     /// Ensures that optional staking policy prescribes value that clears minimum balance requirement
     pub(crate) fn ensure_amount_valid_in_opt_staking_policy<Err>(
         opt_staking_policy: Option<StakingPolicy<Balance, BlockNumber>>,
-        runtime_minimum_balance: Balance,
+        minimum_stake_balance: Balance,
         error: Err,
     ) -> Result<(), Err> {
         if let Some(ref staking_policy) = opt_staking_policy {
-            if staking_policy.amount < runtime_minimum_balance {
+            if staking_policy.amount < minimum_stake_balance {
                 return Err(error);
             }
         }

runtime-modules/hiring/src/lib.rs

@@ -31,7 +31,7 @@ use codec::Codec;
 use runtime_primitives::traits::Zero;
 use runtime_primitives::traits::{MaybeSerialize, Member, One, SimpleArithmetic};
 
-use srml_support::traits::Currency;
+use srml_support::traits::{Currency, Get};
 use srml_support::{decl_module, decl_storage, ensure, Parameter};
 
 use rstd::collections::btree_map::BTreeMap;
@@ -79,6 +79,9 @@ pub trait Trait: system::Trait + stake::Trait + Sized {
 
     /// Marker type for Stake module handler. Indicates that hiring module uses stake module mock.
     type StakeHandlerProvider: StakeHandlerProvider<Self>;
+
+    /// Defines min application or role stake balance.
+    type MinimumStakeBalance: Get<stake::BalanceOf<Self>>;
 }
 
 decl_storage! {
@@ -105,6 +108,9 @@ decl_module! {
     /// Main hiring module definition
     pub struct Module<T: Trait> for enum Call where origin: T::Origin {
 
+        /// Exports const - min application or role stake balance.
+        const MinimumStakeBalance: stake::BalanceOf<T> = T::MinimumStakeBalance::get();
+
         fn on_finalize(now: T::BlockNumber) {
 
             //
@@ -187,7 +193,7 @@ impl<T: Trait> Module<T> {
         Opening::<BalanceOf<T>, T::BlockNumber, T::ApplicationId>::ensure_can_add_opening(
             current_block_height,
             activate_at.clone(),
-            T::Currency::minimum_balance(),
+            T::MinimumStakeBalance::get(),
             application_rationing_policy.clone(),
             application_staking_policy.clone(),
             role_staking_policy.clone(),

runtime-modules/hiring/src/mock.rs

@@ -79,6 +79,10 @@ impl balances::Trait for Test {
     type CreationFee = CreationFee;
 }
 
+parameter_types! {
+    pub const MinimumStakeBalance: u64 = 1; // just non-zero
+}
+
 impl Trait for Test {
     type OpeningId = u64;
 
@@ -87,6 +91,7 @@ impl Trait for Test {
     type ApplicationDeactivatedHandler = TestApplicationDeactivatedHandler;
 
     type StakeHandlerProvider = TestStakeHandlerProvider;
+    type MinimumStakeBalance = MinimumStakeBalance;
 }
 
 impl stake::Trait for Test {

runtime-modules/hiring/src/test/public_api/add_opening.rs

@@ -145,14 +145,14 @@ fn add_opening_succeeds_or_fails_due_to_application_staking_policy() {
 
         //Invalid stake amount
         opening_data.application_staking_policy = Some(StakingPolicy {
-            amount: 1,
+            amount: 0,
             amount_mode: Exact,
             crowded_out_unstaking_period_length: None,
             review_period_expired_unstaking_period_length: None,
         });
 
         opening_data.call_and_assert(Err(
-            AddOpeningError::StakeAmountLessThanMinimumCurrencyBalance(StakePurpose::Application),
+            AddOpeningError::StakeAmountLessThanMinimumStakeBalance(StakePurpose::Application),
         ));
     });
 }
@@ -173,14 +173,14 @@ fn add_opening_succeeds_or_fails_due_to_role_staking_policy() {
 
         //Invalid stake amount
         opening_data.role_staking_policy = Some(StakingPolicy {
-            amount: 1,
+            amount: 0,
             amount_mode: Exact,
             crowded_out_unstaking_period_length: None,
             review_period_expired_unstaking_period_length: None,
         });
 
         opening_data.call_and_assert(Err(
-            AddOpeningError::StakeAmountLessThanMinimumCurrencyBalance(StakePurpose::Role),
+            AddOpeningError::StakeAmountLessThanMinimumStakeBalance(StakePurpose::Role),
         ));
     });
 }

runtime-modules/proposals/codex/src/tests/mock.rs

@@ -186,11 +186,16 @@ impl versioned_store::Trait for Test {
     type Event = ();
 }
 
+parameter_types! {
+    pub const MinimumStakeBalance: u64 = 1; // just non-zero
+}
+
 impl hiring::Trait for Test {
     type OpeningId = u64;
     type ApplicationId = u64;
     type ApplicationDeactivatedHandler = ();
     type StakeHandlerProvider = hiring::Module<Self>;
+    type MinimumStakeBalance = MinimumStakeBalance;
 }
 
 srml_staking_reward_curve::build! {

runtime-modules/service-discovery/src/mock.rs

@@ -79,11 +79,16 @@ impl Trait for Test {
     type Event = MetaEvent;
 }
 
+parameter_types! {
+    pub const MinimumStakeBalance: u64 = 1; // just non-zero
+}
+
 impl hiring::Trait for Test {
     type OpeningId = u64;
     type ApplicationId = u64;
     type ApplicationDeactivatedHandler = ();
     type StakeHandlerProvider = hiring::Module<Self>;
+    type MinimumStakeBalance = MinimumStakeBalance;
 }
 
 impl minting::Trait for Test {

runtime-modules/storage/src/tests/mock.rs

@@ -216,11 +216,16 @@ impl recurringrewards::Trait for Test {
     type RewardRelationshipId = u64;
 }
 
+parameter_types! {
+    pub const MinimumStakeBalance: u64 = 1; // just non-zero
+}
+
 impl hiring::Trait for Test {
     type OpeningId = u64;
     type ApplicationId = u64;
     type ApplicationDeactivatedHandler = ();
     type StakeHandlerProvider = hiring::Module<Self>;
+    type MinimumStakeBalance = MinimumStakeBalance;
 }
 
 pub struct ExtBuilder {

runtime-modules/working-group/src/errors.rs

@@ -294,7 +294,7 @@ impl rstd::convert::From<WrappedError<hiring::AddOpeningError>> for Error {
             hiring::AddOpeningError::OpeningMustActivateInTheFuture => {
                 Error::AddWorkerOpeningActivatesInThePast
             }
-            hiring::AddOpeningError::StakeAmountLessThanMinimumCurrencyBalance(purpose) => {
+            hiring::AddOpeningError::StakeAmountLessThanMinimumStakeBalance(purpose) => {
                 match purpose {
                     hiring::StakePurpose::Role => Error::AddWorkerOpeningRoleStakeLessThanMinimum,
                     hiring::StakePurpose::Application => {

runtime-modules/working-group/src/tests/mock.rs

@@ -67,11 +67,16 @@ impl system::Trait for Test {
     type Version = ();
 }
 
+parameter_types! {
+    pub const MinimumStakeBalance: u64 = 1; // just non-zero
+}
+
 impl hiring::Trait for Test {
     type OpeningId = u64;
     type ApplicationId = u64;
     type ApplicationDeactivatedHandler = ();
     type StakeHandlerProvider = hiring::Module<Self>;
+    type MinimumStakeBalance = MinimumStakeBalance;
 }
 
 impl minting::Trait for Test {

runtime-modules/working-group/src/tests/mod.rs

@@ -57,13 +57,13 @@ fn hire_lead_fails_multiple_applications() {
 }
 
 #[test]
-fn add_worker_opening_succeeds() {
+fn add_opening_succeeds() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
 
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
         EventFixture::assert_last_crate_event(RawEvent::OpeningAdded(opening_id));
     });
@@ -74,10 +74,10 @@ fn add_leader_opening_succeeds_fails_with_incorrect_origin_for_opening_type() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture =
+        let add_opening_fixture =
             AddWorkerOpeningFixture::default().with_opening_type(OpeningType::Leader);
 
-        add_worker_opening_fixture.call_and_assert(Err(Error::RequireRootOrigin));
+        add_opening_fixture.call_and_assert(Err(Error::RequireRootOrigin));
     });
 }
 
@@ -86,25 +86,25 @@ fn add_leader_opening_succeeds() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default()
+        let add_opening_fixture = AddWorkerOpeningFixture::default()
             .with_opening_type(OpeningType::Leader)
             .with_origin(RawOrigin::Root);
 
-        add_worker_opening_fixture.call_and_assert(Ok(()));
+        add_opening_fixture.call_and_assert(Ok(()));
     });
 }
 
 #[test]
-fn add_worker_opening_fails_with_lead_is_not_set() {
+fn add_opening_fails_with_lead_is_not_set() {
     build_test_externalities().execute_with(|| {
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
 
-        add_worker_opening_fixture.call_and_assert(Err(Error::CurrentLeadNotSet));
+        add_opening_fixture.call_and_assert(Err(Error::CurrentLeadNotSet));
     });
 }
 
 #[test]
-fn add_worker_opening_fails_with_invalid_human_readable_text() {
+fn add_opening_fails_with_invalid_human_readable_text() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
@@ -115,119 +115,119 @@ fn add_worker_opening_fails_with_invalid_human_readable_text() {
             },
         );
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default().with_text(Vec::new());
+        let add_opening_fixture = AddWorkerOpeningFixture::default().with_text(Vec::new());
 
-        add_worker_opening_fixture.call_and_assert(Err(Error::Other("OpeningTextTooShort")));
+        add_opening_fixture.call_and_assert(Err(Error::Other("OpeningTextTooShort")));
 
-        let add_worker_opening_fixture =
+        let add_opening_fixture =
             AddWorkerOpeningFixture::default().with_text(b"Long text".to_vec());
 
-        add_worker_opening_fixture.call_and_assert(Err(Error::Other("OpeningTextTooLong")));
+        add_opening_fixture.call_and_assert(Err(Error::Other("OpeningTextTooLong")));
     });
 }
 
 #[test]
-fn add_worker_opening_fails_with_hiring_error() {
+fn add_opening_fails_with_hiring_error() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default()
+        let add_opening_fixture = AddWorkerOpeningFixture::default()
             .with_activate_at(hiring::ActivateOpeningAt::ExactBlock(0));
 
-        add_worker_opening_fixture.call_and_assert(Err(Error::AddWorkerOpeningActivatesInThePast));
+        add_opening_fixture.call_and_assert(Err(Error::AddWorkerOpeningActivatesInThePast));
     });
 }
 
 #[test]
-fn accept_worker_applications_succeeds() {
+fn accept_applications_succeeds() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default()
+        let add_opening_fixture = AddWorkerOpeningFixture::default()
             .with_activate_at(hiring::ActivateOpeningAt::ExactBlock(5));
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let accept_worker_applications_fixture =
+        let accept_applications_fixture =
             AcceptWorkerApplicationsFixture::default_for_opening_id(opening_id);
-        accept_worker_applications_fixture.call_and_assert(Ok(()));
+        accept_applications_fixture.call_and_assert(Ok(()));
 
         EventFixture::assert_last_crate_event(RawEvent::AcceptedApplications(opening_id));
     });
 }
 
 #[test]
-fn accept_worker_applications_fails_for_invalid_opening_type() {
+fn accept_applications_fails_for_invalid_opening_type() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default()
+        let add_opening_fixture = AddWorkerOpeningFixture::default()
             .with_origin(RawOrigin::Root)
             .with_opening_type(OpeningType::Leader)
             .with_activate_at(hiring::ActivateOpeningAt::ExactBlock(5));
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let accept_worker_applications_fixture =
+        let accept_applications_fixture =
             AcceptWorkerApplicationsFixture::default_for_opening_id(opening_id);
-        accept_worker_applications_fixture.call_and_assert(Err(Error::RequireRootOrigin));
+        accept_applications_fixture.call_and_assert(Err(Error::RequireRootOrigin));
     });
 }
 
 #[test]
-fn accept_worker_applications_fails_with_hiring_error() {
+fn accept_applications_fails_with_hiring_error() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let accept_worker_applications_fixture =
+        let accept_applications_fixture =
             AcceptWorkerApplicationsFixture::default_for_opening_id(opening_id);
-        accept_worker_applications_fixture.call_and_assert(Err(
+        accept_applications_fixture.call_and_assert(Err(
             Error::AcceptWorkerApplicationsOpeningIsNotWaitingToBegin,
         ));
     });
 }
 
 #[test]
-fn accept_worker_applications_fails_with_not_lead() {
+fn accept_applications_fails_with_not_lead() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
         SetLeadFixture::set_lead_with_ids(2, 2, 2);
 
-        let accept_worker_applications_fixture =
+        let accept_applications_fixture =
             AcceptWorkerApplicationsFixture::default_for_opening_id(opening_id);
-        accept_worker_applications_fixture.call_and_assert(Err(Error::IsNotLeadAccount));
+        accept_applications_fixture.call_and_assert(Err(Error::IsNotLeadAccount));
     });
 }
 
 #[test]
-fn accept_worker_applications_fails_with_no_opening() {
+fn accept_applications_fails_with_no_opening() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
         let opening_id = 55; // random opening id
 
-        let accept_worker_applications_fixture =
+        let accept_applications_fixture =
             AcceptWorkerApplicationsFixture::default_for_opening_id(opening_id);
-        accept_worker_applications_fixture.call_and_assert(Err(Error::OpeningDoesNotExist));
+        accept_applications_fixture.call_and_assert(Err(Error::OpeningDoesNotExist));
     });
 }
 
 #[test]
-fn apply_on_worker_opening_succeeds() {
+fn apply_on_opening_succeeds() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id);
-        let application_id = appy_on_worker_opening_fixture.call_and_assert(Ok(()));
+        let application_id = apply_on_opening_fixture.call_and_assert(Ok(()));
 
         EventFixture::assert_last_crate_event(RawEvent::AppliedOnOpening(
             opening_id,
@@ -237,59 +237,58 @@ fn apply_on_worker_opening_succeeds() {
 }
 
 #[test]
-fn apply_on_worker_opening_fails_with_no_opening() {
+fn apply_on_opening_fails_with_no_opening() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
         let opening_id = 123; // random opening id
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id);
-        appy_on_worker_opening_fixture.call_and_assert(Err(Error::OpeningDoesNotExist));
+        apply_on_opening_fixture.call_and_assert(Err(Error::OpeningDoesNotExist));
     });
 }
 
 #[test]
-fn apply_on_worker_opening_fails_with_not_set_members() {
+fn apply_on_opening_fails_with_not_set_members() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id)
                 .with_origin(RawOrigin::Signed(55), 55);
-        appy_on_worker_opening_fixture
-            .call_and_assert(Err(Error::OriginIsNeitherMemberControllerOrRoot));
+        apply_on_opening_fixture.call_and_assert(Err(Error::OriginIsNeitherMemberControllerOrRoot));
     });
 }
 
 #[test]
-fn apply_on_worker_opening_fails_with_hiring_error() {
+fn apply_on_opening_fails_with_hiring_error() {
     build_test_externalities().execute_with(|| {
         increase_total_balance_issuance_using_account_id(1, 500000);
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id)
                 .with_application_stake(100);
-        appy_on_worker_opening_fixture
+        apply_on_opening_fixture
             .call_and_assert(Err(Error::AddWorkerOpeningStakeProvidedWhenRedundant));
     });
 }
 
 #[test]
-fn apply_on_worker_opening_fails_with_invalid_application_stake() {
+fn apply_on_opening_fails_with_invalid_application_stake() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
         let stake = 100;
 
-        let add_worker_opening_fixture =
+        let add_opening_fixture =
             AddWorkerOpeningFixture::default().with_policy_commitment(OpeningPolicyCommitment {
                 application_staking_policy: Some(hiring::StakingPolicy {
                     amount: stake,
@@ -297,24 +296,45 @@ fn apply_on_worker_opening_fails_with_invalid_application_stake() {
                 }),
                 ..OpeningPolicyCommitment::default()
             });
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id)
                 .with_origin(RawOrigin::Signed(2), 2)
                 .with_application_stake(stake);
-        appy_on_worker_opening_fixture.call_and_assert(Err(Error::InsufficientBalanceToApply));
+        apply_on_opening_fixture.call_and_assert(Err(Error::InsufficientBalanceToApply));
     });
 }
 
 #[test]
-fn apply_on_worker_opening_fails_with_invalid_role_stake() {
+fn add_opening_fails_with_invalid_zero_application_stake() {
+    build_test_externalities().execute_with(|| {
+        HireLeadFixture::default().hire_lead();
+
+        let zero_stake = 0;
+
+        let add_opening_fixture =
+            AddWorkerOpeningFixture::default().with_policy_commitment(OpeningPolicyCommitment {
+                application_staking_policy: Some(hiring::StakingPolicy {
+                    amount: zero_stake,
+                    amount_mode: hiring::StakingAmountLimitMode::AtLeast,
+                    ..hiring::StakingPolicy::default()
+                }),
+                ..OpeningPolicyCommitment::default()
+            });
+        add_opening_fixture
+            .call_and_assert(Err(Error::AddWorkerOpeningAppliicationStakeLessThanMinimum));
+    });
+}
+
+#[test]
+fn apply_on_opening_fails_with_invalid_role_stake() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
         let stake = 100;
 
-        let add_worker_opening_fixture =
+        let add_opening_fixture =
             AddWorkerOpeningFixture::default().with_policy_commitment(OpeningPolicyCommitment {
                 role_staking_policy: Some(hiring::StakingPolicy {
                     amount: stake,
@@ -322,23 +342,23 @@ fn apply_on_worker_opening_fails_with_invalid_role_stake() {
                 }),
                 ..OpeningPolicyCommitment::default()
             });
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id)
                 .with_role_stake(Some(stake))
                 .with_origin(RawOrigin::Signed(2), 2);
-        appy_on_worker_opening_fixture.call_and_assert(Err(Error::InsufficientBalanceToApply));
+        apply_on_opening_fixture.call_and_assert(Err(Error::InsufficientBalanceToApply));
     });
 }
 
 #[test]
-fn apply_on_worker_opening_fails_with_invalid_text() {
+fn apply_on_opening_fails_with_invalid_text() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
         <crate::WorkerApplicationHumanReadableText<TestWorkingGroupInstance>>::put(
             InputValidationLengthConstraint {
@@ -347,33 +367,31 @@ fn apply_on_worker_opening_fails_with_invalid_text() {
             },
         );
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id).with_text(Vec::new());
-        appy_on_worker_opening_fixture
+        apply_on_opening_fixture
             .call_and_assert(Err(Error::Other("WorkerApplicationTextTooShort")));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id)
                 .with_text(b"Long text".to_vec());
-        appy_on_worker_opening_fixture
-            .call_and_assert(Err(Error::Other("WorkerApplicationTextTooLong")));
+        apply_on_opening_fixture.call_and_assert(Err(Error::Other("WorkerApplicationTextTooLong")));
     });
 }
 
 #[test]
-fn apply_on_worker_opening_fails_with_already_active_application() {
+fn apply_on_opening_fails_with_already_active_application() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id);
-        appy_on_worker_opening_fixture.call_and_assert(Ok(()));
+        apply_on_opening_fixture.call_and_assert(Ok(()));
 
-        appy_on_worker_opening_fixture
-            .call_and_assert(Err(Error::MemberHasActiveApplicationOnOpening));
+        apply_on_opening_fixture.call_and_assert(Err(Error::MemberHasActiveApplicationOnOpening));
     });
 }
 
@@ -382,12 +400,12 @@ fn withdraw_worker_application_succeeds() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id);
-        let application_id = appy_on_worker_opening_fixture.call_and_assert(Ok(()));
+        let application_id = apply_on_opening_fixture.call_and_assert(Ok(()));
 
         let withdraw_application_fixture =
             WithdrawApplicationFixture::default_for_application_id(application_id);
@@ -413,12 +431,12 @@ fn withdraw_worker_application_fails_invalid_origin() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id);
-        let application_id = appy_on_worker_opening_fixture.call_and_assert(Ok(()));
+        let application_id = apply_on_opening_fixture.call_and_assert(Ok(()));
 
         let withdraw_application_fixture =
             WithdrawApplicationFixture::default_for_application_id(application_id)
@@ -432,12 +450,12 @@ fn withdraw_worker_application_fails_with_invalid_application_author() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id);
-        let application_id = appy_on_worker_opening_fixture.call_and_assert(Ok(()));
+        let application_id = apply_on_opening_fixture.call_and_assert(Ok(()));
 
         let invalid_author_account_id = 55;
         let withdraw_application_fixture =
@@ -452,12 +470,12 @@ fn withdraw_worker_application_fails_with_hiring_error() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id);
-        let application_id = appy_on_worker_opening_fixture.call_and_assert(Ok(()));
+        let application_id = apply_on_opening_fixture.call_and_assert(Ok(()));
 
         let withdraw_application_fixture =
             WithdrawApplicationFixture::default_for_application_id(application_id);
@@ -472,12 +490,12 @@ fn terminate_worker_application_succeeds() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id);
-        let application_id = appy_on_worker_opening_fixture.call_and_assert(Ok(()));
+        let application_id = apply_on_opening_fixture.call_and_assert(Ok(()));
 
         let terminate_application_fixture =
             TerminateApplicationFixture::default_for_application_id(application_id);
@@ -492,12 +510,12 @@ fn terminate_worker_application_fails_with_invalid_application_author() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id);
-        let application_id = appy_on_worker_opening_fixture.call_and_assert(Ok(()));
+        let application_id = apply_on_opening_fixture.call_and_assert(Ok(()));
 
         let invalid_author_account_id = 55;
         let terminate_application_fixture =
@@ -512,12 +530,12 @@ fn terminate_worker_application_fails_invalid_origin() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id);
-        let application_id = appy_on_worker_opening_fixture.call_and_assert(Ok(()));
+        let application_id = apply_on_opening_fixture.call_and_assert(Ok(()));
 
         let terminate_application_fixture =
             TerminateApplicationFixture::default_for_application_id(application_id)
@@ -544,12 +562,12 @@ fn terminate_worker_application_fails_with_hiring_error() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id);
-        let application_id = appy_on_worker_opening_fixture.call_and_assert(Ok(()));
+        let application_id = apply_on_opening_fixture.call_and_assert(Ok(()));
 
         let terminate_application_fixture =
             TerminateApplicationFixture::default_for_application_id(application_id);
@@ -564,8 +582,8 @@ fn begin_review_worker_applications_succeeds() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
         let begin_review_worker_applications_fixture =
             BeginReviewWorkerApplicationsFixture::default_for_opening_id(opening_id);
@@ -580,10 +598,10 @@ fn begin_review_worker_applications_fails_with_invalid_origin_for_opening_type()
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default()
+        let add_opening_fixture = AddWorkerOpeningFixture::default()
             .with_origin(RawOrigin::Root)
             .with_opening_type(OpeningType::Leader);
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
         let begin_review_worker_applications_fixture =
             BeginReviewWorkerApplicationsFixture::default_for_opening_id(opening_id);
@@ -596,8 +614,8 @@ fn begin_review_worker_applications_fails_with_not_a_lead() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
         SetLeadFixture::set_lead_with_ids(2, 2, 2);
 
@@ -625,8 +643,8 @@ fn begin_review_worker_applications_with_hiring_error() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
         let begin_review_worker_applications_fixture =
             BeginReviewWorkerApplicationsFixture::default_for_opening_id(opening_id);
@@ -642,8 +660,8 @@ fn begin_review_worker_applications_fails_with_invalid_origin() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
         let begin_review_worker_applications_fixture =
             BeginReviewWorkerApplicationsFixture::default_for_opening_id(opening_id)
@@ -653,12 +671,12 @@ fn begin_review_worker_applications_fails_with_invalid_origin() {
 }
 
 #[test]
-fn fill_worker_opening_succeeds() {
+fn fill_opening_succeeds() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
         increase_total_balance_issuance_using_account_id(1, 10000);
 
-        let add_worker_opening_fixture =
+        let add_opening_fixture =
             AddWorkerOpeningFixture::default().with_policy_commitment(OpeningPolicyCommitment {
                 role_staking_policy: Some(hiring::StakingPolicy {
                     amount: 10,
@@ -668,12 +686,12 @@ fn fill_worker_opening_succeeds() {
                 }),
                 ..OpeningPolicyCommitment::default()
             });
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id)
                 .with_role_stake(Some(10));
-        let application_id = appy_on_worker_opening_fixture.call_and_assert(Ok(()));
+        let application_id = apply_on_opening_fixture.call_and_assert(Ok(()));
 
         let begin_review_worker_applications_fixture =
             BeginReviewWorkerApplicationsFixture::default_for_opening_id(opening_id);
@@ -682,14 +700,14 @@ fn fill_worker_opening_succeeds() {
         let mint_id = create_mint();
         set_mint_id(mint_id);
 
-        let fill_worker_opening_fixture =
+        let fill_opening_fixture =
             FillWorkerOpeningFixture::default_for_ids(opening_id, vec![application_id])
                 .with_reward_policy(RewardPolicy {
                     amount_per_payout: 1000,
                     next_payment_at_block: 20,
                     payout_interval: None,
                 });
-        let worker_id = fill_worker_opening_fixture.call_and_assert(Ok(()));
+        let worker_id = fill_opening_fixture.call_and_assert(Ok(()));
 
         let mut worker_application_dictionary = BTreeMap::new();
         worker_application_dictionary.insert(application_id, worker_id);
@@ -702,12 +720,12 @@ fn fill_worker_opening_succeeds() {
 }
 
 #[test]
-fn fill_worker_opening_fails_with_invalid_origin_for_opening_type() {
+fn fill_opening_fails_with_invalid_origin_for_opening_type() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
         increase_total_balance_issuance_using_account_id(1, 10000);
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default()
+        let add_opening_fixture = AddWorkerOpeningFixture::default()
             .with_policy_commitment(OpeningPolicyCommitment {
                 role_staking_policy: Some(hiring::StakingPolicy {
                     amount: 10,
@@ -719,12 +737,12 @@ fn fill_worker_opening_fails_with_invalid_origin_for_opening_type() {
             })
             .with_opening_type(OpeningType::Leader)
             .with_origin(RawOrigin::Root);
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id)
                 .with_role_stake(Some(10));
-        let application_id = appy_on_worker_opening_fixture.call_and_assert(Ok(()));
+        let application_id = apply_on_opening_fixture.call_and_assert(Ok(()));
 
         let begin_review_worker_applications_fixture =
             BeginReviewWorkerApplicationsFixture::default_for_opening_id(opening_id)
@@ -733,119 +751,118 @@ fn fill_worker_opening_fails_with_invalid_origin_for_opening_type() {
 
         set_mint_id(create_mint());
 
-        let fill_worker_opening_fixture =
+        let fill_opening_fixture =
             FillWorkerOpeningFixture::default_for_ids(opening_id, vec![application_id])
                 .with_reward_policy(RewardPolicy {
                     amount_per_payout: 1000,
                     next_payment_at_block: 20,
                     payout_interval: None,
                 });
-        fill_worker_opening_fixture.call_and_assert(Err(Error::RequireRootOrigin));
+        fill_opening_fixture.call_and_assert(Err(Error::RequireRootOrigin));
     });
 }
 
 #[test]
-fn fill_worker_opening_fails_with_invalid_origin() {
+fn fill_opening_fails_with_invalid_origin() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let fill_worker_opening_fixture =
+        let fill_opening_fixture =
             FillWorkerOpeningFixture::default_for_ids(opening_id, Vec::new())
                 .with_origin(RawOrigin::None);
-        fill_worker_opening_fixture.call_and_assert(Err(Error::RequireSignedOrigin));
+        fill_opening_fixture.call_and_assert(Err(Error::RequireSignedOrigin));
     });
 }
 
 #[test]
-fn fill_worker_opening_fails_with_not_a_lead() {
+fn fill_opening_fails_with_not_a_lead() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
         SetLeadFixture::set_lead_with_ids(2, 2, 2);
 
-        let fill_worker_opening_fixture =
+        let fill_opening_fixture =
             FillWorkerOpeningFixture::default_for_ids(opening_id, Vec::new());
-        fill_worker_opening_fixture.call_and_assert(Err(Error::IsNotLeadAccount));
+        fill_opening_fixture.call_and_assert(Err(Error::IsNotLeadAccount));
     });
 }
 
 #[test]
-fn fill_worker_opening_fails_with_invalid_opening() {
+fn fill_opening_fails_with_invalid_opening() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
         let invalid_opening_id = 6;
 
-        let fill_worker_opening_fixture =
+        let fill_opening_fixture =
             FillWorkerOpeningFixture::default_for_ids(invalid_opening_id, Vec::new());
-        fill_worker_opening_fixture.call_and_assert(Err(Error::OpeningDoesNotExist));
+        fill_opening_fixture.call_and_assert(Err(Error::OpeningDoesNotExist));
     });
 }
 
 #[test]
-fn fill_worker_opening_fails_with_invalid_application_list() {
+fn fill_opening_fails_with_invalid_application_list() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id);
-        let application_id = appy_on_worker_opening_fixture.call_and_assert(Ok(()));
+        let application_id = apply_on_opening_fixture.call_and_assert(Ok(()));
 
         let begin_review_worker_applications_fixture =
             BeginReviewWorkerApplicationsFixture::default_for_opening_id(opening_id);
         begin_review_worker_applications_fixture.call_and_assert(Ok(()));
 
         let invalid_application_id = 66;
-        let fill_worker_opening_fixture = FillWorkerOpeningFixture::default_for_ids(
+        let fill_opening_fixture = FillWorkerOpeningFixture::default_for_ids(
             opening_id,
             vec![application_id, invalid_application_id],
         );
-        fill_worker_opening_fixture
-            .call_and_assert(Err(Error::SuccessfulWorkerApplicationDoesNotExist));
+        fill_opening_fixture.call_and_assert(Err(Error::SuccessfulWorkerApplicationDoesNotExist));
     });
 }
 
 #[test]
-fn fill_worker_opening_fails_with_invalid_application_with_hiring_error() {
+fn fill_opening_fails_with_invalid_application_with_hiring_error() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let fill_worker_opening_fixture =
+        let fill_opening_fixture =
             FillWorkerOpeningFixture::default_for_ids(opening_id, Vec::new());
-        fill_worker_opening_fixture
+        fill_opening_fixture
             .call_and_assert(Err(Error::FullWorkerOpeningOpeningNotInReviewPeriodStage));
     });
 }
 
 #[test]
-fn fill_worker_opening_fails_with_invalid_reward_policy() {
+fn fill_opening_fails_with_invalid_reward_policy() {
     build_test_externalities().execute_with(|| {
         HireLeadFixture::default().hire_lead();
 
-        let add_worker_opening_fixture = AddWorkerOpeningFixture::default();
-        let opening_id = add_worker_opening_fixture.call_and_assert(Ok(()));
+        let add_opening_fixture = AddWorkerOpeningFixture::default();
+        let opening_id = add_opening_fixture.call_and_assert(Ok(()));
 
-        let appy_on_worker_opening_fixture =
+        let apply_on_opening_fixture =
             ApplyOnWorkerOpeningFixture::default_for_opening_id(opening_id);
-        let application_id = appy_on_worker_opening_fixture.call_and_assert(Ok(()));
+        let application_id = apply_on_opening_fixture.call_and_assert(Ok(()));
 
         let begin_review_worker_applications_fixture =
             BeginReviewWorkerApplicationsFixture::default_for_opening_id(opening_id);
         begin_review_worker_applications_fixture.call_and_assert(Ok(()));
 
-        let fill_worker_opening_fixture =
+        let fill_opening_fixture =
             FillWorkerOpeningFixture::default_for_ids(opening_id, vec![application_id])
                 .with_reward_policy(RewardPolicy {
                     amount_per_payout: 10000,
@@ -853,7 +870,7 @@ fn fill_worker_opening_fails_with_invalid_reward_policy() {
                     next_payment_at_block: 0,
                     payout_interval: None,
                 });
-        fill_worker_opening_fixture
+        fill_opening_fixture
     });
 }
 

runtime/src/lib.rs

@@ -502,11 +502,16 @@ impl versioned_store_permissions::CreateClassPermissionsChecker<Runtime>
     }
 }
 
+parameter_types! {
+    pub const MinimumStakeBalance: Balance = 1; // just non-zero
+}
+
 impl hiring::Trait for Runtime {
     type OpeningId = u64;
     type ApplicationId = u64;
     type ApplicationDeactivatedHandler = (); // TODO - what needs to happen?
     type StakeHandlerProvider = hiring::Module<Self>;
+    type MinimumStakeBalance = MinimumStakeBalance;
 }
 
 impl minting::Trait for Runtime {