diff --git a/adapters/couchdb_adapter.go b/adapters/couchdb_adapter.go
index 3bc585a..5b23d9d 100644
--- a/adapters/couchdb_adapter.go
+++ b/adapters/couchdb_adapter.go
@@ -29,6 +29,14 @@ func (adapter couchdbAdapter) DeleteDatabase(ctx context.Context, database strin
 }
 
 func (adapter couchdbAdapter) HasDatabaseUserWithAccess(ctx context.Context, database string, username string) (bool, error) {
+	dbExists, dbExistsErr := adapter.HasDatabase(ctx, database)
+	if dbExistsErr != nil {
+		return false, dbExistsErr
+	}
+	if !dbExists {
+		return false, nil
+	}
+
 	sc, err := adapter.db.DB(database).Security(ctx)
 	if err != nil {
 		return false, err
diff --git a/adapters/couchdb_adapter_test.go b/adapters/couchdb_adapter_test.go
index e5d1c24..b2a7eba 100644
--- a/adapters/couchdb_adapter_test.go
+++ b/adapters/couchdb_adapter_test.go
@@ -9,7 +9,7 @@ import (
 	"github.com/go-kivik/kivik/v4"
 )
 
-func TestCouchDB(t *testing.T) {
+func prepareCouchDB(t *testing.T) (context.Context, adapters.DatabaseAdapter, ClientConnectTest) {
 	databaseHost := "localhost"
 	databasePort := "5984"
 
@@ -32,5 +32,17 @@ func TestCouchDB(t *testing.T) {
 		return err
 	}
 
+	return ctx, adapter, clientConnectTest
+}
+
+func TestCouchDB(t *testing.T) {
+	ctx, adapter, clientConnectTest := prepareCouchDB(t)
+
 	testHelper(t, ctx, adapter, clientConnectTest)
 }
+
+func TestCouchDBCleanup(t *testing.T) {
+	ctx, adapter, _ := prepareCouchDB(t)
+
+	cleanupTestHelper(t, ctx, adapter)
+}
diff --git a/adapters/mongo_adapter_test.go b/adapters/mongo_adapter_test.go
index 83356dd..ad02561 100644
--- a/adapters/mongo_adapter_test.go
+++ b/adapters/mongo_adapter_test.go
@@ -10,7 +10,7 @@ import (
 	"go.mongodb.org/mongo-driver/mongo/options"
 )
 
-func TestMongoDB(t *testing.T) {
+func prepareMongoDB(t *testing.T) (context.Context, adapters.DatabaseAdapter, ClientConnectTest) {
 	databaseHost := "localhost"
 	databasePort := "27017"
 
@@ -34,5 +34,17 @@ func TestMongoDB(t *testing.T) {
 		return err
 	}
 
+	return ctx, adapter, clientConnectTest
+}
+
+func TestMongoDB(t *testing.T) {
+	ctx, adapter, clientConnectTest := prepareMongoDB(t)
+
 	testHelper(t, ctx, adapter, clientConnectTest)
 }
+
+func TestMongoDBCleanup(t *testing.T) {
+	ctx, adapter, _ := prepareMongoDB(t)
+
+	cleanupTestHelper(t, ctx, adapter)
+}
diff --git a/adapters/mssql_adapter.go b/adapters/mssql_adapter.go
index 8260b8a..de96c25 100644
--- a/adapters/mssql_adapter.go
+++ b/adapters/mssql_adapter.go
@@ -41,6 +41,14 @@ func (adapter mssqlAdapter) DeleteDatabase(ctx context.Context, database string)
 }
 
 func (adapter mssqlAdapter) HasDatabaseUserWithAccess(ctx context.Context, database string, username string) (bool, error) {
+	dbExists, dbExistsErr := adapter.HasDatabase(ctx, database)
+	if dbExistsErr != nil {
+		return false, dbExistsErr
+	}
+	if !dbExists {
+		return false, nil
+	}
+
 	var count int
 	query := fmt.Sprintf("USE [%s]; SELECT COUNT(*) FROM sys.database_principals WHERE authentication_type=2 AND name='%s';", database, username)
 	err := adapter.db.QueryRowContext(ctx, query).Scan(&count)
diff --git a/adapters/mssql_adapter_test.go b/adapters/mssql_adapter_test.go
index 270fc07..5027770 100644
--- a/adapters/mssql_adapter_test.go
+++ b/adapters/mssql_adapter_test.go
@@ -9,7 +9,7 @@ import (
 	"github.com/anbraten/k8s-external-database-operator/adapters"
 )
 
-func TestMsSqlDB(t *testing.T) {
+func prepareMsSqlDB(t *testing.T) (context.Context, adapters.DatabaseAdapter, ClientConnectTest) {
 	databaseHost := "localhost"
 	databasePort := "1433"
 
@@ -32,5 +32,17 @@ func TestMsSqlDB(t *testing.T) {
 		return err
 	}
 
+	return ctx, adapter, clientConnectTest
+}
+
+func TestMsSqlDB(t *testing.T) {
+	ctx, adapter, clientConnectTest := prepareMsSqlDB(t)
+
 	testHelper(t, ctx, adapter, clientConnectTest)
 }
+
+func TestMsSqlDBCleanup(t *testing.T) {
+	ctx, adapter, _ := prepareMsSqlDB(t)
+
+	cleanupTestHelper(t, ctx, adapter)
+}
diff --git a/adapters/mysql_adapter_test.go b/adapters/mysql_adapter_test.go
index e3b8c42..acb4ece 100644
--- a/adapters/mysql_adapter_test.go
+++ b/adapters/mysql_adapter_test.go
@@ -9,7 +9,7 @@ import (
 	"github.com/anbraten/k8s-external-database-operator/adapters"
 )
 
-func TestMySqlDB(t *testing.T) {
+func prepareMySqlDB(t *testing.T) (context.Context, adapters.DatabaseAdapter, ClientConnectTest) {
 	databaseHost := "localhost"
 	databasePort := "3306"
 
@@ -32,5 +32,17 @@ func TestMySqlDB(t *testing.T) {
 		return err
 	}
 
+	return ctx, adapter, clientConnectTest
+}
+
+func TestMySqlDB(t *testing.T) {
+	ctx, adapter, clientConnectTest := prepareMySqlDB(t)
+
 	testHelper(t, ctx, adapter, clientConnectTest)
 }
+
+func TestMySqlDBCleanup(t *testing.T) {
+	ctx, adapter, _ := prepareMySqlDB(t)
+
+	cleanupTestHelper(t, ctx, adapter)
+}
diff --git a/adapters/postgres_adapter_test.go b/adapters/postgres_adapter_test.go
index 6022cab..85c83ce 100644
--- a/adapters/postgres_adapter_test.go
+++ b/adapters/postgres_adapter_test.go
@@ -9,7 +9,7 @@ import (
 	"github.com/jackc/pgx/v4"
 )
 
-func TestPostgresDB(t *testing.T) {
+func preparePostgresDB(t *testing.T) (context.Context, adapters.DatabaseAdapter, ClientConnectTest) {
 	databaseHost := "localhost"
 	databasePort := "5432"
 
@@ -32,5 +32,17 @@ func TestPostgresDB(t *testing.T) {
 		return err
 	}
 
+	return ctx, adapter, clientConnectTest
+}
+
+func TestPostgresDB(t *testing.T) {
+	ctx, adapter, clientConnectTest := preparePostgresDB(t)
+
 	testHelper(t, ctx, adapter, clientConnectTest)
 }
+
+func TestPostgresDBCleanup(t *testing.T) {
+	ctx, adapter, _ := preparePostgresDB(t)
+
+	cleanupTestHelper(t, ctx, adapter)
+}
diff --git a/adapters/utils_test.go b/adapters/utils_test.go
index b068df2..3c9d923 100644
--- a/adapters/utils_test.go
+++ b/adapters/utils_test.go
@@ -60,3 +60,16 @@ func testHelper(t *testing.T, ctx context.Context, adapter adapters.DatabaseAdap
 		t.Fatalf("Database user does not exists")
 	}
 }
+
+func cleanupTestHelper(t *testing.T, ctx context.Context, adapter adapters.DatabaseAdapter) {
+	result, err := adapter.HasDatabaseUserWithAccess(ctx, "non-existing-db", "non-existing-user")
+	if err != nil {
+		t.Fatalf("Checking for existing database user failed: %s", err)
+	}
+	if result {
+		t.Fatalf("database and user existing but expecting to be non-existing")
+	}
+	
+	// TODO: test db.DeleteDatabaseUser
+	// TODO: test db.DeleteDatabase
+}