chore: add some more tests for TransactionValue

Signed-off-by: blam <ben@blam.sh>

plugins/catalog-backend/src/next/Context/TransactionValue.test.ts

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2021 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { TransactionValue } from './TransactionValue';
+import { Knex } from 'knex';
+import { BackgroundContext } from './BackgroundContext';
+
+describe('TransactionValue Context', () => {
+  it('should be able to store tx values and retrieve them from a context', () => {
+    const tx = {} as Knex.Transaction;
+    const ctx = new BackgroundContext();
+
+    const nextCtx = TransactionValue.in(ctx, tx);
+
+    expect(TransactionValue.from(nextCtx)).toBe(tx);
+  });
+
+  it('should throw when there is no tx value in the context', () => {
+    const ctx = new BackgroundContext();
+
+    expect(() => TransactionValue.from(ctx)).toThrow(
+      /No transaction available in context/,
+    );
+  });
+});