1 files changed, 78 insertions, 0 deletions
diff --git a/dom/system/tests/ioutils/file_ioutils_test_fixtures.js b/dom/system/tests/ioutils/file_ioutils_test_fixtures.js
new file mode 100644
index 0000000000..5d2e5011c9
--- /dev/null
+++ b/dom/system/tests/ioutils/file_ioutils_test_fixtures.js
@@ -0,0 +1,78 @@
+// Utility functions.
+
+Uint8Array.prototype.equals = function equals(other) {
+  if (this.byteLength !== other.byteLength) {
+    return false;
+  }
+  return this.every((val, i) => val === other[i]);
+};
+
+async function createFile(location, contents = "") {
+  if (typeof contents === "string") {
+    contents = new TextEncoder().encode(contents);
+  }
+  await IOUtils.write(location, contents);
+  const exists = await fileExists(location);
+  ok(exists, `Created temporary file at: ${location}`);
+}
+
+async function createDir(location) {
+  await IOUtils.makeDirectory(location, {
+    ignoreExisting: true,
+    createAncestors: true,
+  });
+  const exists = await dirExists(location);
+  ok(exists, `Created temporary directory at: ${location}`);
+}
+
+async function fileHasBinaryContents(location, expectedContents) {
+  if (!(expectedContents instanceof Uint8Array)) {
+    throw new TypeError("expectedContents must be a byte array");
+  }
+  info(`Opening ${location} for reading`);
+  const bytes = await IOUtils.read(location);
+  return bytes.equals(expectedContents);
+}
+
+async function fileHasTextContents(location, expectedContents) {
+  if (typeof expectedContents !== "string") {
+    throw new TypeError("expectedContents must be a string");
+  }
+  info(`Opening ${location} for reading`);
+  const bytes = await IOUtils.read(location);
+  const contents = new TextDecoder().decode(bytes);
+  return contents === expectedContents;
+}
+
+async function fileExists(file) {
+  try {
+    let { type } = await IOUtils.stat(file);
+    return type === "regular";
+  } catch (ex) {
+    return false;
+  }
+}
+
+async function dirExists(dir) {
+  try {
+    let { type } = await IOUtils.stat(dir);
+    return type === "directory";
+  } catch (ex) {
+    return false;
+  }
+}
+
+async function cleanup(...files) {
+  for (const file of files) {
+    await IOUtils.remove(file, {
+      ignoreAbsent: true,
+      recursive: true,
+    });
+    const exists = await IOUtils.exists(file);
+    ok(!exists, `Removed temporary file: ${file}`);
+  }
+}
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms));
+}