Update web-platform-tests to revision 20424e735a5e6ac7a474ae35d86c714272aea0e8

tests/wpt/web-platform-tests/native-file-system/resources/test-helpers.js

@@ -0,0 +1,67 @@
+async function cleanupSandboxedFileSystem() {
+    const dir = await FileSystemDirectoryHandle.getSystemDirectory({ type: 'sandbox' });
+    for await (let entry of dir.getEntries()) {
+        if (entry.isDirectory)
+            await entry.removeRecursively();
+        else
+            await entry.remove();
+   }
+}
+
+async function getFileSize(handle) {
+    const file = await handle.getFile();
+    return file.size;
+}
+
+async function getFileContents(handle) {
+    const file = await handle.getFile();
+    return new Response(file).text();
+}
+
+async function getDirectoryEntryCount(handle) {
+    let result = 0;
+    for await (let entry of handle.getEntries()) {
+        result++;
+    }
+    return result;
+}
+
+async function getSortedDirectoryEntries(handle) {
+    let result = [];
+    for await (let entry of handle.getEntries()) {
+        if (entry.isDirectory)
+            result.push(entry.name + '/');
+        else
+            result.push(entry.name);
+    }
+    result.sort();
+    return result;
+}
+
+async function createEmptyFile(test, name, parent) {
+    const dir = parent ? parent : await FileSystemDirectoryHandle.getSystemDirectory({ type: 'sandbox' });
+    const handle = await dir.getFile(name, { create: true });
+    test.add_cleanup(async () => {
+        try {
+            await handle.remove();
+        } catch (e) {
+            // Ignore any errors when removing files, as tests might already remove the file.
+        }
+    });
+    // Make sure the file is empty.
+    assert_equals(await getFileSize(handle), 0);
+    return handle;
+}
+
+async function createFileWithContents(test, name, contents, parent) {
+    const handle = await createEmptyFile(test, name, parent);
+    const writer = await handle.createWriter();
+    await writer.write(0, new Blob([contents]));
+    return handle;
+}
+
+function garbageCollect() {
+    // TODO(https://github.com/web-platform-tests/wpt/issues/7899): Change to
+    // some sort of cross-browser GC trigger.
+    if (self.gc) self.gc();
+};