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test(@angular-devkit/build-angular): disable Webpack caching during harness-based unit tests #21897

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merged 1 commit into from
Oct 7, 2021
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test(@angular-devkit/build-angular): disable Webpack caching during harness-based unit tests #21897

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22 changes: 19 additions & 3 deletions packages/angular_devkit/build_angular/src/testing/builder-harness.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -39,11 +39,27 @@ export interface BuilderHarnessExecutionOptions {
useNativeFileWatching: boolean;
}

/**
* The default set of fields provided to all builders executed via the BuilderHarness.
* `root` and `sourceRoot` are required for most Angular builders to function.
* `cli.cache.enabled` set to false provides improved test isolation guarantees by disabling
* the Webpack caching.
*/
const DEFAULT_PROJECT_METADATA = {
root: '.',
sourceRoot: 'src',
cli: {
cache: {
enabled: false,
},
},
};

export class BuilderHarness<T> {
private readonly builderInfo: BuilderInfo;
private schemaRegistry = new json.schema.CoreSchemaRegistry();
private projectName = 'test';
private projectMetadata: Record<string, unknown> = { root: '.', sourceRoot: 'src' };
private projectMetadata: Record<string, unknown> = DEFAULT_PROJECT_METADATA;
private targetName?: string;
private options = new Map<string | null, T>();
private builderTargets = new Map<
Expand Down Expand Up @@ -365,7 +381,7 @@ class HarnessBuilderContext implements BuilderContext {

get analytics(): analytics.Analytics {
// Can be undefined even though interface does not allow it
return (undefined as unknown) as analytics.Analytics;
return undefined as unknown as analytics.Analytics;
}

addTeardown(teardown: () => Promise<void> | void): void {
Expand Down Expand Up @@ -447,7 +463,7 @@ class HarnessBuilderContext implements BuilderContext {
options: json.JsonObject,
builderName: string,
): Promise<T> {
return (this.contextHost.validate(options, builderName) as unknown) as T;
return this.contextHost.validate(options, builderName) as unknown as T;
}

// Unused report methods
Expand Down