chore: add basic unit tests for cache options

packages/@aws-cdk/aws-ecr-assets/test/build-image-cache.test.ts

@@ -0,0 +1,88 @@
+import * as fs from 'fs';
+import * as path from 'path';
+import { AssetManifest } from '@aws-cdk/cloud-assembly-schema';
+import { App, Stack } from '@aws-cdk/core';
+import { AssetManifestArtifact, CloudArtifact, CloudAssembly } from '@aws-cdk/cx-api';
+import { DockerImageAsset } from '../lib';
+
+describe('build cache', () => {
+  test('manifest contains cache from options ', () => {
+    // GIVEN
+    const app = new App();
+    const stack = new Stack(app);
+    const asset = new DockerImageAsset(stack, 'DockerImage6', {
+      directory: path.join(__dirname, 'demo-image'),
+      cacheFrom: [{ type: 'registry', params: { image: 'foo' } }],
+    });
+
+    // WHEN
+    const asm = app.synth();
+
+    // THEN
+    const manifestArtifact = getAssetManifest(asm);
+    const manifest = readAssetManifest(manifestArtifact);
+
+    expect(Object.keys(manifest.dockerImages ?? {}).length).toBe(1);
+    expect(manifest.dockerImages?.[asset.assetHash]?.source.cacheFrom?.length).toBe(1);
+    expect(manifest.dockerImages?.[asset.assetHash]?.source.cacheFrom?.[0]).toStrictEqual({
+      type: 'registry',
+      params: { image: 'foo' },
+    });
+  });
+  test('manifest contains cache to options ', () => {
+    // GIVEN
+    const app = new App();
+    const stack = new Stack(app);
+    const asset = new DockerImageAsset(stack, 'DockerImage6', {
+      directory: path.join(__dirname, 'demo-image'),
+      cacheTo: { type: 'inline' },
+    });
+
+    // WHEN
+    const asm = app.synth();
+
+    // THEN
+    const manifestArtifact = getAssetManifest(asm);
+    const manifest = readAssetManifest(manifestArtifact);
+
+    expect(Object.keys(manifest.dockerImages ?? {}).length).toBe(1);
+    expect(manifest.dockerImages?.[asset.assetHash]?.source.cacheTo).toStrictEqual({
+      type: 'inline',
+    });
+  });
+
+  test('manifest does not contain options when not specified', () => {
+    // GIVEN
+    const app = new App();
+    const stack = new Stack(app);
+    const asset = new DockerImageAsset(stack, 'DockerImage6', {
+      directory: path.join(__dirname, 'demo-image'),
+    });
+
+    // WHEN
+    const asm = app.synth();
+
+    // THEN
+    const manifestArtifact = getAssetManifest(asm);
+    const manifest = readAssetManifest(manifestArtifact);
+    expect(Object.keys(manifest.dockerImages ?? {}).length).toBe(1);
+    expect(manifest.dockerImages?.[asset.assetHash]?.source.cacheFrom).toBeUndefined();
+    expect(manifest.dockerImages?.[asset.assetHash]?.source.cacheTo).toBeUndefined();
+  });
+});
+
+function isAssetManifest(x: CloudArtifact): x is AssetManifestArtifact {
+  return x instanceof AssetManifestArtifact;
+}
+
+function getAssetManifest(asm: CloudAssembly): AssetManifestArtifact {
+  const manifestArtifact = asm.artifacts.filter(isAssetManifest)[0];
+  if (!manifestArtifact) {
+    throw new Error('no asset manifest in assembly');
+  }
+  return manifestArtifact;
+}
+
+function readAssetManifest(manifestArtifact: AssetManifestArtifact): AssetManifest {
+  return JSON.parse(fs.readFileSync(manifestArtifact.file, { encoding: 'utf-8' }));
+}