test: update WPT compression to ae05f5cb53

panva · Mar 4, 2026 · Mar 4, 2026 · Mar 4, 2026 · Mar 4, 2026 · Mar 4, 2026
commit 9247c562b36f6a8f0b68f984089bdc40f88069ae
diff --git a/test/fixtures/wpt/README.md b/test/fixtures/wpt/README.md
@@ -11,7 +11,7 @@ See [test/wpt](../../wpt/README.md) for information on how these tests are run.
 Last update:
 
 - common: https://github.com/web-platform-tests/wpt/tree/dbd648158d/common
-- compression: https://github.com/web-platform-tests/wpt/tree/67880a4eb8/compression
+- compression: https://github.com/web-platform-tests/wpt/tree/ae05f5cb53/compression
 - console: https://github.com/web-platform-tests/wpt/tree/e48251b778/console
 - dom/abort: https://github.com/web-platform-tests/wpt/tree/dc928169ee/dom/abort
 - dom/events: https://github.com/web-platform-tests/wpt/tree/0a811c5161/dom/events

diff --git a/test/fixtures/wpt/compression/compression-bad-chunks.any.js b/test/fixtures/wpt/compression/compression-bad-chunks.any.js
@@ -0,0 +1,57 @@
+// META: global=window,worker,shadowrealm
+// META: script=resources/formats.js
+
+'use strict';
+
+const badChunks = [
+  {
+    name: 'undefined',
+    value: undefined
+  },
+  {
+    name: 'null',
+    value: null
+  },
+  {
+    name: 'numeric',
+    value: 3.14
+  },
+  {
+    name: 'object, not BufferSource',
+    value: {}
+  },
+  {
+    name: 'array',
+    value: [65]
+  },
+  {
+    name: 'SharedArrayBuffer',
+    // Use a getter to postpone construction so that all tests don't fail where
+    // SharedArrayBuffer is not yet implemented.
+    get value() {
+      // See https://github.com/whatwg/html/issues/5380 for why not `new SharedArrayBuffer()`
+      return new WebAssembly.Memory({ shared:true, initial:1, maximum:1 }).buffer;
+    }
+  },
+  {
+    name: 'shared Uint8Array',
+    get value() {
+      // See https://github.com/whatwg/html/issues/5380 for why not `new SharedArrayBuffer()`
+      return new Uint8Array(new WebAssembly.Memory({ shared:true, initial:1, maximum:1 }).buffer)
+    }
+  },
+];
+
+for (const format of formats) {
+  for (const chunk of badChunks) {
+    promise_test(async t => {
+      const cs = new CompressionStream(format);
+      const reader = cs.readable.getReader();
+      const writer = cs.writable.getWriter();
+      const writePromise = writer.write(chunk.value);
+      const readPromise = reader.read();
+      await promise_rejects_js(t, TypeError, writePromise, 'write should reject');
+      await promise_rejects_js(t, TypeError, readPromise, 'read should reject');
+    }, `chunk of type ${chunk.name} should error the stream for ${format}`);
+  }
+}
diff --git a/test/fixtures/wpt/compression/compression-bad-chunks.tentative.any.js b/test/fixtures/wpt/compression/compression-bad-chunks.tentative.any.js
diff --git a/...ession-constructor-error.tentative.any.js → ...sion/compression-constructor-error.any.js b/...ession-constructor-error.tentative.any.js → ...sion/compression-constructor-error.any.js
diff --git a/...on-including-empty-chunk.tentative.any.js → .../compression-including-empty-chunk.any.js b/...on-including-empty-chunk.tentative.any.js → .../compression-including-empty-chunk.any.js
@@ -1,5 +1,7 @@
 // META: global=window,worker,shadowrealm
 // META: script=third_party/pako/pako_inflate.min.js
+// META: script=resources/decompress.js
+// META: script=resources/formats.js
 // META: timeout=long
 
 'use strict';
@@ -42,22 +44,13 @@ const chunkLists = [
 ];
 const expectedValue = new TextEncoder().encode('HelloHello');
 
-for (const chunkList of chunkLists) {
-  promise_test(async t => {
-    const compressedData = await compressChunkList(chunkList, 'deflate');
-    // decompress with pako, and check that we got the same result as our original string
-    assert_array_equals(expectedValue, pako.inflate(compressedData), 'value should match');
-  }, `the result of compressing [${chunkList}] with deflate should be 'HelloHello'`);
-
-  promise_test(async t => {
-    const compressedData = await compressChunkList(chunkList, 'gzip');
-    // decompress with pako, and check that we got the same result as our original string
-    assert_array_equals(expectedValue, pako.inflate(compressedData), 'value should match');
-  }, `the result of compressing [${chunkList}] with gzip should be 'HelloHello'`);
-
-  promise_test(async t => {
-    const compressedData = await compressChunkList(chunkList, 'deflate-raw');
-    // decompress with pako, and check that we got the same result as our original string
-    assert_array_equals(expectedValue, pako.inflateRaw(compressedData), 'value should match');
-  }, `the result of compressing [${chunkList}] with deflate-raw should be 'HelloHello'`);
+for (const format of formats) {
+  for (const chunkList of chunkLists) {
+    promise_test(async t => {
+      const compressedData = await compressChunkList(chunkList, format);
+      const decompressedData = await decompressDataOrPako(compressedData, format);
+      // check that we got the same result as our original string
+      assert_array_equals(expectedValue, decompressedData, 'value should match');
+    }, `the result of compressing [${chunkList}] with ${format} should be 'HelloHello'`);
+  }
 }
diff --git a/test/fixtures/wpt/compression/compression-large-flush-output.any.js b/test/fixtures/wpt/compression/compression-large-flush-output.any.js
@@ -1,6 +1,8 @@
 // META: global=window,worker,shadowrealm
 // META: script=third_party/pako/pako_inflate.min.js
 // META: script=resources/concatenate-stream.js
+// META: script=resources/decompress.js
+// META: script=resources/formats.js
 // META: timeout=long
 
 'use strict';
@@ -21,21 +23,11 @@ const fullData = new TextEncoder().encode(JSON.stringify(Array.from({ length: 10
 const data = fullData.subarray(0, 35_579);
 const expectedValue = data;
 
-promise_test(async t => {
-  const compressedData = await compressData(data, 'deflate');
-  // decompress with pako, and check that we got the same result as our original string
-  assert_array_equals(expectedValue, pako.inflate(compressedData), 'value should match');
-}, `deflate compression with large flush output`);
-
-promise_test(async t => {
-  const compressedData = await compressData(data, 'gzip');
-  // decompress with pako, and check that we got the same result as our original string
-  assert_array_equals(expectedValue, pako.inflate(compressedData), 'value should match');
-}, `gzip compression with large flush output`);
-
-promise_test(async t => {
-  const compressedData = await compressData(data, 'deflate-raw');
-  // decompress with pako, and check that we got the same result as our original string
-  assert_array_equals(expectedValue, pako.inflateRaw(compressedData), 'value should match');
-}, `deflate-raw compression with large flush output`);
-
+for (const format of formats) {
+  promise_test(async t => {
+    const compressedData = await compressData(data, format);
+    const decompressedData = await decompressDataOrPako(compressedData, format);
+    // check that we got the same result as our original string
+    assert_array_equals(decompressedData, expectedValue, 'value should match');
+  }, `${format} compression with large flush output`);
+}
diff --git a/test/fixtures/wpt/compression/compression-multiple-chunks.any.js b/test/fixtures/wpt/compression/compression-multiple-chunks.any.js
@@ -0,0 +1,58 @@
+// META: global=window,worker,shadowrealm
+// META: script=third_party/pako/pako_inflate.min.js
+// META: script=resources/decompress.js
+// META: script=resources/formats.js
+// META: timeout=long
+
+'use strict';
+
+// This test asserts that compressing multiple chunks should work.
+
+// Example: ('Hello', 3) => TextEncoder().encode('HelloHelloHello')
+function makeExpectedChunk(input, numberOfChunks) {
+  const expectedChunk = input.repeat(numberOfChunks);
+  return new TextEncoder().encode(expectedChunk);
+}
+
+// Example: ('Hello', 3, 'deflate') => compress ['Hello', 'Hello', Hello']
+async function compressMultipleChunks(input, numberOfChunks, format) {
+  const cs = new CompressionStream(format);
+  const writer = cs.writable.getWriter();
+  const chunk = new TextEncoder().encode(input);
+  for (let i = 0; i < numberOfChunks; ++i) {
+    writer.write(chunk);
+  }
+  const closePromise = writer.close();
+  const out = [];
+  const reader = cs.readable.getReader();
+  let totalSize = 0;
+  while (true) {
+    const { value, done } = await reader.read();
+    if (done)
+      break;
+    out.push(value);
+    totalSize += value.byteLength;
+  }
+  await closePromise;
+  const concatenated = new Uint8Array(totalSize);
+  let offset = 0;
+  for (const array of out) {
+    concatenated.set(array, offset);
+    offset += array.byteLength;
+  }
+  return concatenated;
+}
+
+const hello = 'Hello';
+
+for (const format of formats) {
+  for (let numberOfChunks = 2; numberOfChunks <= 16; ++numberOfChunks) {
+    promise_test(async t => {
+      const compressedData = await compressMultipleChunks(hello, numberOfChunks, format);
+      const decompressedData = await decompressDataOrPako(compressedData, format);
+      const expectedValue = makeExpectedChunk(hello, numberOfChunks);
+      // check that we got the same result as our original string
+      assert_array_equals(decompressedData, expectedValue, 'value should match');
+    }, `compressing ${numberOfChunks} chunks with ${format} should work`);
+  }
+}
diff --git a/test/fixtures/wpt/compression/compression-multiple-chunks.tentative.any.js b/test/fixtures/wpt/compression/compression-multiple-chunks.tentative.any.js
diff --git a/test/fixtures/wpt/compression/compression-output-length.any.js b/test/fixtures/wpt/compression/compression-output-length.any.js
@@ -0,0 +1,47 @@
+// META: global=window,worker,shadowrealm
+// META: script=resources/formats.js
+
+'use strict';
+
+// This test asserts that compressed data length is shorter than the original
+// data length. If the input is extremely small, the compressed data may be
+// larger than the original data.
+
+const LARGE_FILE = '/media/test-av-384k-44100Hz-1ch-320x240-30fps-10kfr.webm';
+
+async function compressArrayBuffer(input, format) {
+  const cs = new CompressionStream(format);
+  const writer = cs.writable.getWriter();
+  writer.write(input);
+  const closePromise = writer.close();
+  const out = [];
+  const reader = cs.readable.getReader();
+  let totalSize = 0;
+  while (true) {
+    const { value, done } = await reader.read();
+    if (done)
+      break;
+    out.push(value);
+    totalSize += value.byteLength;
+  }
+  await closePromise;
+  const concatenated = new Uint8Array(totalSize);
+  let offset = 0;
+  for (const array of out) {
+    concatenated.set(array, offset);
+    offset += array.byteLength;
+  }
+  return concatenated;
+}
+
+for (const format of formats) {
+  promise_test(async () => {
+    const response = await fetch(LARGE_FILE);
+    const buffer = await response.arrayBuffer();
+    const bufferView = new Uint8Array(buffer);
+    const originalLength = bufferView.length;
+    const compressedData = await compressArrayBuffer(bufferView, format);
+    const compressedLength = compressedData.length;
+    assert_less_than(compressedLength, originalLength, 'output should be smaller');
+  }, `the length of ${format} data should be shorter than that of the original data`);
+}