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test: expand coverage for sources, helpers, and package entry
Add targeted tests that exercise previously untested branches and edge cases: the abstract `Source` base class, `SizeOnlySource`'s `updateHash`, `CompatSource`'s optional delegates, `RawSource`'s type validation and Buffer-backed source path, `OriginalSource`'s `getName` and Buffer-backed map path, `ConcatSource`'s `buffer()` fallbacks and re-optimization paths, `PrefixSource`'s accessors and empty-prefix handling, `ReplaceSource`'s accessors, guards, hash stability, and edge cases, `CachedSource`'s lazy source accessor, hash flushing, map-only streamChunks, and Buffer round-tripping, and `SourceMapSource`'s string/buffer source-map variants and hash inclusion of `removeOriginalSource`. Add a dedicated helpers unit test file covering `getGeneratedSourceInfo`, `getSource`, `splitIntoLines`, `splitIntoPotentialTokens`, `readMappings`, `getFromStreamChunks`, `streamAndGetSourceAndMap`, and `stringBufferUtils`, including string-interning toggles and gap filling for non-sequential source/name indices.
1 parent 5a07869 commit 7db8867

12 files changed

Lines changed: 1111 additions & 0 deletions

‎test/CachedSource.js‎

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@@ -419,4 +419,151 @@ describe.each([
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expect(getHash(clone())).toBe(getHash(original));
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expect(calls).toBe(3);
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});
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it("should expose originalLazy (function form) and original()", () => {
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const original = new RawSource("Hello World");
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const lazy = () => original;
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const source = new CachedSource(lazy);
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expect(source.originalLazy()).toBe(lazy);
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expect(source.original()).toBe(original);
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// After original() resolves the function, originalLazy returns the resolved source
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expect(source.originalLazy()).toBe(original);
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});
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it("should compute size from cached buffer when _cachedSize is undefined", () => {
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const buffer = Buffer.from("Hello World");
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// Provide cachedData with buffer but no size
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const cachedSource = new CachedSource(new RawSource("Hello World"), {
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buffer,
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maps: new Map(),
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});
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expect(cachedSource.size()).toBe(buffer.length);
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expect(cachedSource.size()).toBe(buffer.length);
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});
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it("should return null for missing map when cached entry is empty", () => {
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const cachedSource = new CachedSource(new RawSource("Hello World"), {
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buffer: Buffer.from("Hello World"),
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size: 11,
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maps: new Map([["{}", {}]]),
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});
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expect(cachedSource.map()).toBeNull();
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});
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it("should flush accumulated hash strings when they exceed the threshold", () => {
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class StringyHashSource extends Source {
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source() {
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return "ignored";
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}
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buffer() {
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return Buffer.from("ignored");
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}
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size() {
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return 7;
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}
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map() {
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return null;
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}
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updateHash(hash) {
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for (let i = 0; i < 15000; i++) {
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hash.update(`chunk-${i}-`);
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}
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}
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}
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const cachedSource = new CachedSource(new StringyHashSource());
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const hashA = crypto.createHash("md5");
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cachedSource.updateHash(hashA);
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const digestA = hashA.digest("hex");
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// When hashing again, the cached hash update is replayed directly
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const hashB = crypto.createHash("md5");
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cachedSource.updateHash(hashB);
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const digestB = hashB.digest("hex");
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expect(digestA).toBe(digestB);
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});
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it("should handle hash updates starting with a Buffer (no prior string to flush)", () => {
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class BufferFirstHashSource extends Source {
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source() {
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return "text";
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}
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buffer() {
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return Buffer.from("text");
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}
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size() {
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return 4;
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}
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map() {
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return null;
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}
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updateHash(hash) {
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// Start with a Buffer so the tracker "else" branch runs
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// with currentString === undefined, and also pass a long string
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// so the length-gate in the "string" branch is exercised.
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hash.update(Buffer.from("leading-buffer-"));
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hash.update("a".repeat(11000));
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hash.update("short-string");
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}
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}
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const cachedSource = new CachedSource(new BufferFirstHashSource());
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const hashA = crypto.createHash("md5");
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cachedSource.updateHash(hashA);
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const digestA = hashA.digest("hex");
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const hashB = crypto.createHash("md5");
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cachedSource.updateHash(hashB);
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const digestB = hashB.digest("hex");
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expect(digestA).toBe(digestB);
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});
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it("should allow streamChunks when cached map exists but source is not cached", () => {
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const original = new OriginalSource("Hello World", "file.js");
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const cachedSource = new CachedSource(original);
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// Populate map cache only (no source/buffer cached yet)
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cachedSource.map({});
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const chunks = [];
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cachedSource.streamChunks(
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{},
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(...args) => {
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chunks.push(args);
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},
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() => {},
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() => {},
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);
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expect(chunks.length).toBeGreaterThan(0);
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});
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it("should round-trip CachedSource with a Buffer-backed source", () => {
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const buffer = Buffer.from(Array.from({ length: 64 }, (_, i) => i));
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const original = new RawSource(buffer);
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const source = new CachedSource(original);
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// Populate _cachedSource with the Buffer
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source.source();
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source.size();
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const cachedData = source.getCachedData();
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expect(cachedData.source).toBe(false);
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// @ts-expect-error for tests
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const clone = new CachedSource(null, cachedData);
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expect(clone.source()).toEqual(source.source());
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expect(clone.buffer()).toEqual(source.buffer());
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expect(clone.size()).toEqual(source.size());
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});
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});

‎test/CompatSource.js‎

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@@ -36,4 +36,107 @@ describe("compatSource", () => {
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});
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expect(calledWith).toEqual([Buffer.from(CONTENT)]);
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});
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it("should use buffer from source-like when provided", () => {
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const CONTENT = "Line1\n\nLine3\n";
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const buffer = Buffer.from(CONTENT);
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const source = CompatSource.from({
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source() {
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return CONTENT;
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},
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buffer() {
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return buffer;
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},
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});
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expect(source.buffer()).toBe(buffer);
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});
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it("should use size from super when sourceLike doesn't define size", () => {
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const CONTENT = "Hello";
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const source = CompatSource.from({
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source() {
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return CONTENT;
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},
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});
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expect(source.size()).toBe(5);
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});
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it("should call map from sourceLike when provided", () => {
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const map = {
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version: 3,
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sources: ["a.js"],
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names: [],
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mappings: "",
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file: "x",
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};
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const source = CompatSource.from({
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source() {
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return "content";
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},
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map() {
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return map;
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},
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updateHash(hash) {
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hash.update("custom");
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},
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});
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expect(source.map()).toBe(map);
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});
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it("should call sourceAndMap from sourceLike when provided", () => {
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const map = {
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version: 3,
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sources: ["a.js"],
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names: [],
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mappings: "",
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file: "x",
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};
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const sourceAndMap = { source: "content", map };
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const source = CompatSource.from({
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source() {
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return "content";
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},
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sourceAndMap() {
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return sourceAndMap;
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},
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});
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expect(source.sourceAndMap()).toBe(sourceAndMap);
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});
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it("should call updateHash from sourceLike when provided", () => {
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/** @type {(string | Buffer)[]} */
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const calledWith = [];
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const source = CompatSource.from({
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source() {
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return "content";
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},
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updateHash(hash) {
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hash.update("custom-hash");
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},
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});
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source.updateHash({
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// @ts-expect-error for tests
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update(value) {
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calledWith.push(value);
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},
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});
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expect(calledWith).toEqual(["custom-hash"]);
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});
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it("should throw when map is defined but updateHash is not", () => {
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const source = CompatSource.from({
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source() {
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return "content";
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},
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map() {
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return null;
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},
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});
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expect(() => {
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source.updateHash({
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// @ts-expect-error for tests
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update() {},
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});
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}).toThrow(/'map' method must also provide an 'updateHash' method/);
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});
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});

‎test/ConcatSource.js‎

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@@ -212,6 +212,89 @@ describe("concatSource", () => {
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`);
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});
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it("should concat a SourceLike child without a buffer() method that returns a Buffer", () => {
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const customBuffer = Buffer.from("custom-content");
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const customSource = {
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source() {
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return customBuffer;
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},
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size() {
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return customBuffer.length;
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},
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};
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const source = new ConcatSource(customSource, new RawSource("-after"));
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const result = source.buffer();
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expect(result).toEqual(
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Buffer.concat([customBuffer, Buffer.from("-after")]),
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);
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});
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it("should concat a SourceLike child where source() returns a string (no buffer())", () => {
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const customSource = {
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source() {
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return "custom-content";
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},
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size() {
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return "custom-content".length;
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},
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};
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const source = new ConcatSource(customSource, new RawSource("-after"));
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const result = source.buffer();
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expect(result).toEqual(
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Buffer.concat([Buffer.from("custom-content"), Buffer.from("-after")]),
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);
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});
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it("should optimize nested string-only ConcatSources across re-optimization", () => {
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// Create two ConcatSources that produce RawSource (kept in stringsAsRawSources)
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const c1 = new ConcatSource("a", "b");
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c1.source(); // triggers _optimize, putting its RawSource("ab") into stringsAsRawSources
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const c2 = new ConcatSource("c", "d");
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c2.source(); // same, puts RawSource("cd") into stringsAsRawSources
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const merged = new ConcatSource();
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merged.add(c1); // flatten c1's children
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merged.add("x");
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merged.add(c2);
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merged.add("y");
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merged.add(c1);
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expect(merged.source()).toBe("abxcdyab");
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});
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it("should re-optimize when raw source followed by regular source", () => {
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const c1 = new ConcatSource("a", "b");
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c1.source(); // places RawSource into stringsAsRawSources
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const regular = new OriginalSource("Z", "z.js");
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const merged = new ConcatSource();
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merged.add(c1); // flatten
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merged.add(regular);
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expect(merged.source()).toBe("abZ");
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expect(merged.getChildren()).toHaveLength(2);
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});
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it("should reflect empty ConcatSource", () => {
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const source = new ConcatSource();
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expect(source.source()).toBe("");
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expect(source.size()).toBe(0);
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expect(source.buffer()).toEqual(Buffer.alloc(0));
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});
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it("should flatten nested ConcatSource via add()", () => {
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const inner = new ConcatSource("a", "b");
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const outer = new ConcatSource();
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outer.add(inner);
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outer.add("c");
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expect(outer.source()).toBe("abc");
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});
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it("should optimize on first getChildren() call", () => {
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const source = new ConcatSource("a", "b", new RawSource("c"));
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// Call getChildren without first calling source()/size()/buffer()
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const children = source.getChildren();
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expect(children.length).toBeGreaterThan(0);
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});
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it("should handle column mapping correctly with missing sources", () => {
216299
const source = new ConcatSource(
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"/*! For license information please see main.js.LICENSE.txt */",

‎test/OriginalSource.js‎

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Original file line numberDiff line numberDiff line change
@@ -102,6 +102,25 @@ describe.each([
102102
expect(source.size()).toBe(256);
103103
});
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it("should expose getName()", () => {
106+
const source = new OriginalSource("hi", "file.js");
107+
expect(source.getName()).toBe("file.js");
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});
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it("should compute map correctly from buffer-backed source", () => {
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const content = "Line1\nLine2\n";
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const source = new OriginalSource(Buffer.from(content), "file.js");
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expect(source.sourceAndMap().source).toBe(content);
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});
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it("should map correctly when constructed from a Buffer (streamChunks path)", () => {
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const content = "Line1\nLine2\n";
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const source = new OriginalSource(Buffer.from(content), "file.js");
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// Calling map() without calling source() first to ensure streamChunks
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// populates _value from the buffer
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expect(source.map({ columns: false })).not.toBeNull();
122+
});
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105124
it("should return the correct size for unicode files", () => {
106125
const source = new OriginalSource("😋", "file.js");
107126
expect(source.size()).toBe(4);

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