config-loader: StaticConfigSource tests + fix

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/config-loader/src/sources/StaticConfigSource.test.ts

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2023 The Backstage Authors
+ *
+ * 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 { JsonObject } from '@backstage/types';
+import { StaticConfigSource } from './StaticConfigSource';
+import { readAll } from './__testUtils__/testUtils';
+import ZenObservable from 'zen-observable';
+
+describe('StaticConfigSource', () => {
+  it('should be created from data', async () => {
+    const source = StaticConfigSource.create({ data: { a: 1 } });
+    await expect(readAll(source)).resolves.toEqual([
+      [{ data: { a: 1 }, context: 'static-config' }],
+    ]);
+  });
+
+  it('should be created from promise', async () => {
+    const source = StaticConfigSource.create({
+      data: Promise.resolve({ a: 1 }),
+    });
+    await expect(readAll(source)).resolves.toEqual([
+      [{ data: { a: 1 }, context: 'static-config' }],
+    ]);
+  });
+
+  it('should be created from observable', async () => {
+    const source = StaticConfigSource.create({
+      data: ZenObservable.of<JsonObject>({ a: 1 }, { a: 2 }, { a: 3 }),
+    });
+    await expect(readAll(source)).resolves.toEqual([
+      [{ data: { a: 1 }, context: 'static-config' }],
+      [{ data: { a: 2 }, context: 'static-config' }],
+      [{ data: { a: 3 }, context: 'static-config' }],
+    ]);
+  });
+});

packages/config-loader/src/sources/StaticConfigSource.ts

@@ -51,7 +51,6 @@ class StaticObservableConfigSource implements ConfigSource {
         deferred = simpleDefer();
       },
       complete() {
-        queue.length = 0;
         deferred.resolve();
       },
     });