add tests for emitting refresh keys

Signed-off-by: Kiss Miklos <miklos@roadie.io>

.changeset/great-cats-sit.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-catalog-backend': patch
+---
+
+Fixes a bug to be able to utilize refresh keys after the entity is loaded from cache

plugins/catalog-backend/src/modules/core/UrlReaderProcessor.test.ts

@@ -127,19 +127,25 @@ describe('UrlReaderProcessor', () => {
     mockCache.get.mockResolvedValue(cacheItem);
     const processor = new UrlReaderProcessor({ reader, logger });
 
-    const generated = (await new Promise<CatalogProcessorResult>(emit =>
-      processor.readLocation(
-        spec,
-        false,
-        emit,
-        defaultEntityDataParser,
-        mockCache,
-      ),
-    )) as CatalogProcessorEntityResult;
+    const emitted = new Array<CatalogProcessorResult>();
+    await processor.readLocation(
+      spec,
+      false,
+      r => emitted.push(r),
+      defaultEntityDataParser,
+      mockCache,
+    );
+
+    const entity = emitted[0];
+    const refresh = emitted[1];
+
+    expect(entity.type).toBe('entity');
+    expect(entity.location).toEqual(spec);
+    expect(entity.entity).toEqual({ mock: 'entity' });
+
+    expect(refresh.type).toBe('refresh');
+    expect(refresh.key).toBe('url:http://localhost/component.yaml');
 
-    expect(generated.type).toBe('entity');
-    expect(generated.location).toEqual(spec);
-    expect(generated.entity).toEqual({ mock: 'entity' });
     expect(mockCache.get).toBeCalledWith('v1');
     expect(mockCache.get).toBeCalledTimes(1);
     expect(mockCache.set).toBeCalledTimes(0);