1 files changed, 130 insertions, 0 deletions
diff --git a/js/copy_file_test.ts b/js/copy_file_test.ts
new file mode 100644
index 000000000..846cfcbc4
--- /dev/null
+++ b/js/copy_file_test.ts
@@ -0,0 +1,130 @@
+import { testPerm, assert, assertEqual } from "./test_util.ts";
+import * as deno from "deno";
+
+function readFileString(filename: string): string {
+  const dataRead = deno.readFileSync(filename);
+  const dec = new TextDecoder("utf-8");
+  return dec.decode(dataRead);
+}
+
+function writeFileString(filename: string, s: string) {
+  const enc = new TextEncoder();
+  const data = enc.encode(s);
+  deno.writeFileSync(filename, data, 0o666);
+}
+
+function assertSameContent(filename1: string, filename2: string) {
+  const data1 = deno.readFileSync(filename1);
+  const data2 = deno.readFileSync(filename2);
+  assertEqual(data1, data2);
+}
+
+testPerm({ write: true }, function copyFileSyncSuccess() {
+  const tempDir = deno.makeTempDirSync();
+  const fromFilename = tempDir + "/from.txt";
+  const toFilename = tempDir + "/to.txt";
+  writeFileString(fromFilename, "Hello world!");
+  deno.copyFileSync(fromFilename, toFilename);
+  // No change to original file
+  assertEqual(readFileString(fromFilename), "Hello world!");
+  // Original == Dest
+  assertSameContent(fromFilename, toFilename);
+});
+
+testPerm({ write: true }, function copyFileSyncFailure() {
+  const tempDir = deno.makeTempDirSync();
+  const fromFilename = tempDir + "/from.txt";
+  const toFilename = tempDir + "/to.txt";
+  // We skip initial writing here, from.txt does not exist
+  let err;
+  try {
+    deno.copyFileSync(fromFilename, toFilename);
+  } catch (e) {
+    err = e;
+  }
+  assert(!!err);
+  // Rust deem non-existent path as invalid input
+  assertEqual(err.kind, deno.ErrorKind.InvalidInput);
+  assertEqual(err.name, "InvalidInput");
+});
+
+testPerm({ write: true }, function copyFileSyncOverwrite() {
+  const tempDir = deno.makeTempDirSync();
+  const fromFilename = tempDir + "/from.txt";
+  const toFilename = tempDir + "/to.txt";
+  writeFileString(fromFilename, "Hello world!");
+  // Make Dest exist and have different content
+  writeFileString(toFilename, "Goodbye!");
+  deno.copyFileSync(fromFilename, toFilename);
+  // No change to original file
+  assertEqual(readFileString(fromFilename), "Hello world!");
+  // Original == Dest
+  assertSameContent(fromFilename, toFilename);
+});
+
+testPerm({ write: false }, function copyFileSyncPerm() {
+  let err;
+  try {
+    deno.copyFileSync("/from.txt", "/to.txt");
+  } catch (e) {
+    err = e;
+  }
+  assert(!!err);
+  assertEqual(err.kind, deno.ErrorKind.PermissionDenied);
+  assertEqual(err.name, "PermissionDenied");
+});
+
+testPerm({ write: true }, async function copyFileSuccess() {
+  const tempDir = deno.makeTempDirSync();
+  const fromFilename = tempDir + "/from.txt";
+  const toFilename = tempDir + "/to.txt";
+  writeFileString(fromFilename, "Hello world!");
+  await deno.copyFile(fromFilename, toFilename);
+  // No change to original file
+  assertEqual(readFileString(fromFilename), "Hello world!");
+  // Original == Dest
+  assertSameContent(fromFilename, toFilename);
+});
+
+testPerm({ write: true }, async function copyFileFailure() {
+  const tempDir = deno.makeTempDirSync();
+  const fromFilename = tempDir + "/from.txt";
+  const toFilename = tempDir + "/to.txt";
+  // We skip initial writing here, from.txt does not exist
+  let err;
+  try {
+    await deno.copyFile(fromFilename, toFilename);
+  } catch (e) {
+    err = e;
+  }
+  assert(!!err);
+  // Rust deem non-existent path as invalid input
+  assertEqual(err.kind, deno.ErrorKind.InvalidInput);
+  assertEqual(err.name, "InvalidInput");
+});
+
+testPerm({ write: true }, async function copyFileOverwrite() {
+  const tempDir = deno.makeTempDirSync();
+  const fromFilename = tempDir + "/from.txt";
+  const toFilename = tempDir + "/to.txt";
+  writeFileString(fromFilename, "Hello world!");
+  // Make Dest exist and have different content
+  writeFileString(toFilename, "Goodbye!");
+  await deno.copyFile(fromFilename, toFilename);
+  // No change to original file
+  assertEqual(readFileString(fromFilename), "Hello world!");
+  // Original == Dest
+  assertSameContent(fromFilename, toFilename);
+});
+
+testPerm({ write: false }, async function copyFilePerm() {
+  let err;
+  try {
+    await deno.copyFile("/from.txt", "/to.txt");
+  } catch (e) {
+    err = e;
+  }
+  assert(!!err);
+  assertEqual(err.kind, deno.ErrorKind.PermissionDenied);
+  assertEqual(err.name, "PermissionDenied");
+});