feat(core/coretesting): make memDB satisfy db.Db interface (#22570)

tests/go.mod

@@ -50,6 +50,7 @@ require (
 	cosmossdk.io/x/slashing v0.0.0-00010101000000-000000000000
 	cosmossdk.io/x/staking v0.0.0-20240226161501-23359a0b6d91
 	github.com/cometbft/cometbft/api v1.0.0-rc.1
+	github.com/cosmos/cosmos-db v1.0.3-0.20240911104526-ddc3f09bfc22
 	github.com/google/go-cmp v0.6.0
 	github.com/google/gofuzz v1.2.0
 	github.com/jhump/protoreflect v1.17.0
@@ -103,7 +104,6 @@ require (
 	github.com/cockroachdb/tokenbucket v0.0.0-20230807174530-cc333fc44b06 // indirect
 	github.com/cometbft/cometbft-db v0.15.0 // indirect
 	github.com/cosmos/btcutil v1.0.5 // indirect
-	github.com/cosmos/cosmos-db v1.0.3-0.20240911104526-ddc3f09bfc22 // indirect
 	github.com/cosmos/crypto v0.1.2 // indirect
 	github.com/cosmos/go-bip39 v1.0.0 // indirect
 	github.com/cosmos/gogogateway v1.2.0 // indirect

tests/integration/type_check.go

@@ -0,0 +1,14 @@
+package integration
+
+import (
+	coretesting "cosmossdk.io/core/testing"
+
+	db "github.com/cosmos/cosmos-db"
+)
+
+// This file contains a list of type checks that are used to ensure that implementations
+// matches the interface. We do not do those type checks directly in the components to
+// avoid to bring in more dependencies than needed.
+var (
+	_ db.DB = (*coretesting.MemDB)(nil)
+)