How to use the clean-css.prototype function in clean-css
To help you get started, we’ve selected a few clean-css examples, based on popular ways it is used in public projects.
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puzzle-js / puzzle-js / tests / resource-injector.spec.ts View on Github 
it("should inject style sheets using default version", async (done) => {
// arrange
const fragments = {
"f1": FragmentHelper.create(),
"f2": FragmentHelper.create()
};
sandbox.stub(fragments.f1, "getAsset").callsFake((arg) => arg + "-CSS-");
sandbox.stub(fragments.f2, "getAsset").callsFake((arg) => arg + "-CSS-");
sandbox.stub(ResourceFactory.instance, "getRawContent").callsFake( (arg): any => arg + "-CSS-");
sandbox.stub(CleanCSS.prototype, "minify").callsFake( (arg): any => ({ styles: arg }));
// act
const dom = cheerio.load("");
const resourceInjector = new ResourceInjector(fragments, "", {});
await resourceInjector.injectStyleSheets(dom as any, false);
const c1 = fragments.f1.config;
const c2 = fragments.f2.config;
const assets = c1.assets.concat(c2.assets).filter((asset) => asset.type === RESOURCE_TYPE.CSS);
const deps = c1.dependencies.concat(c2.dependencies).filter((dep) => dep.type === RESOURCE_TYPE.CSS);
let expectedDependencyList = assets.concat(deps).map( (res) => res.name);
expectedDependencyList = expectedDependencyList.filter((v,i) => expectedDependencyList.indexOf(v) === i); // remove dublications
const expectedCssContent = expectedDependencyList.concat([""]); // for last -CSS-it("should inject style sheets using passive version", async (done) => {
// arrange
const fragments = {
"f1": FragmentHelper.create(),
"f2": FragmentHelper.create()
};
const f1Version = faker.random.arrayElement(["2.0.0", "3.0.0"]);
const f2Version = faker.random.arrayElement(["2.0.0", "3.0.0"]);
sandbox.stub(fragments.f1, "detectVersion").callsFake(() => f1Version);
sandbox.stub(fragments.f2, "detectVersion").callsFake( () => f2Version);
sandbox.stub(fragments.f1, "getAsset").callsFake((arg) => arg + "-CSS-");
sandbox.stub(fragments.f2, "getAsset").callsFake((arg) => arg + "-CSS-");
sandbox.stub(ResourceFactory.instance, "getRawContent").callsFake( (arg): any => arg + "-CSS-");
sandbox.stub(CleanCSS.prototype, "minify").callsFake( (arg): any => ({ styles: arg }));
// act
const dom = cheerio.load("");
const resourceInjector = new ResourceInjector(fragments, "", {});
await resourceInjector.injectStyleSheets(dom as any, false);
const c1 = fragments.f1.config.passiveVersions[f1Version];
const c2 = fragments.f2.config.passiveVersions[f2Version];
const assets = c1.assets.concat(c2.assets).filter((asset) => asset.type === RESOURCE_TYPE.CSS);
const deps = c1.dependencies.concat(c2.dependencies).filter((dep) => dep.type === RESOURCE_TYPE.CSS);
const expectedDependencyList = assets.concat(deps).map( (res) => res.name);
const expectedCssContent = expectedDependencyList.concat([""]); // for last -CSS-
// assert
