Add Era module to Conway testlib

Author: Lucsanszky

eras/conway/impl/CHANGELOG.md

@@ -19,6 +19,10 @@
 * Moved `CertState` to `State` module
 * Move `ToPutusData` instances for `CoinPerByte`, `DRepVotingThresholds` and `PoolVotingThresholds` with their respective types
 
+### `testlib`
+
+* Added `Era` module with `ConwayEraTest` class
+
 ## 1.19.0.0
 
 * Add `ConwayInstantStake`, `conwayInstantStakeCredentialsL`, `addConwayInstantStake`, `deleteConwayInstantStake`, `resolveConwayInstantStake`

eras/conway/impl/cardano-ledger-conway.cabal

@@ -130,6 +130,7 @@ library testlib
     Test.Cardano.Ledger.Conway.Binary.Regression
     Test.Cardano.Ledger.Conway.Binary.RoundTrip
     Test.Cardano.Ledger.Conway.CDDL
+    Test.Cardano.Ledger.Conway.Era
     Test.Cardano.Ledger.Conway.Genesis
     Test.Cardano.Ledger.Conway.Imp
     Test.Cardano.Ledger.Conway.Imp.BbodySpec

eras/conway/impl/testlib/Test/Cardano/Ledger/Conway/Era.hs

@@ -0,0 +1,37 @@
+{-# LANGUAGE UndecidableSuperClasses #-}
+{-# OPTIONS_GHC -Wno-orphans #-}
+
+module Test.Cardano.Ledger.Conway.Era (
+  module Test.Cardano.Ledger.Babbage.Era,
+  ConwayEraTest,
+) where
+
+import Cardano.Ledger.Conway
+import Cardano.Ledger.Conway.Core
+import Cardano.Ledger.Conway.Governance
+import Cardano.Ledger.Conway.State
+import Test.Cardano.Ledger.Babbage.Era
+import Test.Cardano.Ledger.Conway.Arbitrary ()
+import Test.Cardano.Ledger.Conway.TreeDiff ()
+
+class
+  ( BabbageEraTest era
+  , ConwayEraTxBody era
+  , ConwayEraCertState era
+  , ConwayEraGov era
+  ) =>
+  ConwayEraTest era
+
+instance EraTest ConwayEra
+
+instance ShelleyEraTest ConwayEra
+
+instance AllegraEraTest ConwayEra
+
+instance MaryEraTest ConwayEra
+
+instance AlonzoEraTest ConwayEra
+
+instance BabbageEraTest ConwayEra
+
+instance ConwayEraTest ConwayEra