test: refactor repl tab complete tests

refactor the test/parallel/test-repl-tab-complete.js file by:
 - making the tests in the file self-contained
   (instead of all of them sharing the same REPL instance and
   constantly calling `.clear` on it)
 - using the test runner with appropriate descriptions to make
   clearer what is being tested
 - extracting some tests in their own js test files
   (to increase isolation of the tests and help with issues such
   as flakiness)

PR-URL: #58636
Reviewed-By: Giovanni Bucci <github@puskin.it>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-repl-tab-complete-buffer.js

@@ -0,0 +1,73 @@
+'use strict';
+
+const common = require('../common');
+const ArrayStream = require('../common/arraystream');
+const { hijackStderr, restoreStderr } = require('../common/hijackstdio');
+const assert = require('assert');
+
+const repl = require('repl');
+
+const input = new ArrayStream();
+const replServer = repl.start({
+  prompt: '',
+  input,
+  output: process.stdout,
+  allowBlockingCompletions: true,
+});
+
+// Some errors are passed to the domain, but do not callback
+replServer._domain.on('error', assert.ifError);
+
+for (const type of [
+  Array,
+  Buffer,
+
+  Uint8Array,
+  Uint16Array,
+  Uint32Array,
+
+  Uint8ClampedArray,
+  Int8Array,
+  Int16Array,
+  Int32Array,
+  Float32Array,
+  Float64Array,
+]) {
+  input.run(['.clear']);
+
+  if (type === Array) {
+    input.run([
+      'var ele = [];',
+      'for (let i = 0; i < 1e6 + 1; i++) ele[i] = 0;',
+      'ele.biu = 1;',
+    ]);
+  } else if (type === Buffer) {
+    input.run(['var ele = Buffer.alloc(1e6 + 1); ele.biu = 1;']);
+  } else {
+    input.run([`var ele = new ${type.name}(1e6 + 1); ele.biu = 1;`]);
+  }
+
+  hijackStderr(common.mustNotCall());
+  replServer.complete(
+    'ele.',
+    common.mustCall((err, data) => {
+      restoreStderr();
+      assert.ifError(err);
+
+      const ele =
+        type === Array ? [] : type === Buffer ? Buffer.alloc(0) : new type(0);
+
+      assert.strictEqual(data[0].includes('ele.biu'), true);
+
+      data[0].forEach((key) => {
+        if (!key || key === 'ele.biu') return;
+        assert.notStrictEqual(ele[key.slice(4)], undefined);
+      });
+    })
+  );
+}
+
+// check Buffer.prototype.length not crashing.
+// Refs: https://github.com/nodejs/node/pull/11961
+input.run(['.clear']);
+replServer.complete('Buffer.prototype.', common.mustCall());

test/parallel/test-repl-tab-complete-custom-completer.js

@@ -0,0 +1,75 @@
+'use strict';
+
+const common = require('../common');
+const ArrayStream = require('../common/arraystream');
+const assert = require('assert');
+
+const repl = require('repl');
+
+const putIn = new ArrayStream();
+
+// To test custom completer function.
+// Sync mode.
+{
+  const customCompletions = 'aaa aa1 aa2 bbb bb1 bb2 bb3 ccc ddd eee'.split(' ');
+  const testCustomCompleterSyncMode = repl.start({
+    prompt: '',
+    input: putIn,
+    output: putIn,
+    completer: function completer(line) {
+      const hits = customCompletions.filter((c) => c.startsWith(line));
+      // Show all completions if none found.
+      return [hits.length ? hits : customCompletions, line];
+    }
+  });
+
+  // On empty line should output all the custom completions
+  // without complete anything.
+  testCustomCompleterSyncMode.complete('', common.mustCall((error, data) => {
+    assert.deepStrictEqual(data, [
+      customCompletions,
+      '',
+    ]);
+  }));
+
+  // On `a` should output `aaa aa1 aa2` and complete until `aa`.
+  testCustomCompleterSyncMode.complete('a', common.mustCall((error, data) => {
+    assert.deepStrictEqual(data, [
+      'aaa aa1 aa2'.split(' '),
+      'a',
+    ]);
+  }));
+}
+
+// To test custom completer function.
+// Async mode.
+{
+  const customCompletions = 'aaa aa1 aa2 bbb bb1 bb2 bb3 ccc ddd eee'.split(' ');
+  const testCustomCompleterAsyncMode = repl.start({
+    prompt: '',
+    input: putIn,
+    output: putIn,
+    completer: function completer(line, callback) {
+      const hits = customCompletions.filter((c) => c.startsWith(line));
+      // Show all completions if none found.
+      callback(null, [hits.length ? hits : customCompletions, line]);
+    }
+  });
+
+  // On empty line should output all the custom completions
+  // without complete anything.
+  testCustomCompleterAsyncMode.complete('', common.mustCall((error, data) => {
+    assert.deepStrictEqual(data, [
+      customCompletions,
+      '',
+    ]);
+  }));
+
+  // On `a` should output `aaa aa1 aa2` and complete until `aa`.
+  testCustomCompleterAsyncMode.complete('a', common.mustCall((error, data) => {
+    assert.deepStrictEqual(data, [
+      'aaa aa1 aa2'.split(' '),
+      'a',
+    ]);
+  }));
+}

test/parallel/test-repl-tab-complete-files.js

@@ -0,0 +1,80 @@
+'use strict';
+
+const common = require('../common');
+const ArrayStream = require('../common/arraystream');
+const assert = require('assert');
+const path = require('path');
+
+const { isMainThread } = require('worker_threads');
+
+if (!isMainThread) {
+  common.skip('process.chdir is not available in Workers');
+}
+
+const repl = require('repl');
+
+const replServer = repl.start({
+  prompt: '',
+  input: new ArrayStream(),
+  output: process.stdout,
+  allowBlockingCompletions: true,
+});
+
+// Some errors are passed to the domain, but do not callback
+replServer._domain.on('error', assert.ifError);
+
+// Tab completion for files/directories
+{
+  process.chdir(__dirname);
+
+  const readFileSyncs = ['fs.readFileSync("', 'fs.promises.readFileSync("'];
+  if (!common.isWindows) {
+    readFileSyncs.forEach((readFileSync) => {
+      const fixturePath = `${readFileSync}../fixtures/test-repl-tab-completion`;
+      replServer.complete(
+        fixturePath,
+        common.mustCall((err, data) => {
+          assert.strictEqual(err, null);
+          assert.ok(data[0][0].includes('.hiddenfiles'));
+          assert.ok(data[0][1].includes('hellorandom.txt'));
+          assert.ok(data[0][2].includes('helloworld.js'));
+        })
+      );
+
+      replServer.complete(
+        `${fixturePath}/hello`,
+        common.mustCall((err, data) => {
+          assert.strictEqual(err, null);
+          assert.ok(data[0][0].includes('hellorandom.txt'));
+          assert.ok(data[0][1].includes('helloworld.js'));
+        })
+      );
+
+      replServer.complete(
+        `${fixturePath}/.h`,
+        common.mustCall((err, data) => {
+          assert.strictEqual(err, null);
+          assert.ok(data[0][0].includes('.hiddenfiles'));
+        })
+      );
+
+      replServer.complete(
+        `${readFileSync}./xxxRandom/random`,
+        common.mustCall((err, data) => {
+          assert.strictEqual(err, null);
+          assert.strictEqual(data[0].length, 0);
+        })
+      );
+
+      const testPath = fixturePath.slice(0, -1);
+      replServer.complete(
+        testPath,
+        common.mustCall((err, data) => {
+          assert.strictEqual(err, null);
+          assert.ok(data[0][0].includes('test-repl-tab-completion'));
+          assert.strictEqual(data[1], path.basename(testPath));
+        })
+      );
+    });
+  }
+}

test/parallel/test-repl-tab-complete-on-editor-mode.js

@@ -1,21 +1,48 @@
 'use strict';
 
-require('../common');
+const common = require('../common');
+const assert = require('assert');
 const ArrayStream = require('../common/arraystream');
 const repl = require('repl');
 
-const stream = new ArrayStream();
-const replServer = repl.start({
-  input: stream,
-  output: stream,
-  terminal: true,
-});
+// Tab completion in editor mode
+{
+  const editorStream = new ArrayStream();
+  const editor = repl.start({
+    stream: editorStream,
+    terminal: true,
+    useColors: false
+  });
 
-// Editor mode
-replServer.write('.editor\n');
+  editorStream.run(['.clear']);
+  editorStream.run(['.editor']);
+
+  editor.completer('Uin', common.mustCall((_error, data) => {
+    assert.deepStrictEqual(data, [['Uint'], 'Uin']);
+  }));
+
+  editorStream.run(['.clear']);
+  editorStream.run(['.editor']);
+
+  editor.completer('var log = console.l', common.mustCall((_error, data) => {
+    assert.deepStrictEqual(data, [['console.log'], 'console.l']);
+  }));
+}
 
 // Regression test for https://github.com/nodejs/node/issues/43528
-replServer.write('a');
-replServer.write(null, { name: 'tab' }); // Should not throw
+{
+  const stream = new ArrayStream();
+  const replServer = repl.start({
+    input: stream,
+    output: stream,
+    terminal: true,
+  });
+
+  // Editor mode
+  replServer.write('.editor\n');
+
+  replServer.write('a');
+  replServer.write(null, { name: 'tab' }); // Should not throw
 
-replServer.close();
+  replServer.close();
+}