test: add test for spawnAsPromise

Author: gnikit

test/exit-code-err.ts

@@ -0,0 +1,3 @@
+process.stdout.write('Hello World!');
+process.stderr.write('Errors');
+process.exit(1);

test/exit-code.ts

@@ -0,0 +1,2 @@
+process.stdout.write('Hello World!');
+process.stderr.write('No errors');

test/tools.test.ts

@@ -1,5 +1,6 @@
+import * as path from 'path';
 import * as assert from 'assert';
-import { shellTask } from '../src/lib/tools';
+import { shellTask, spawnAsPromise } from '../src/lib/tools';
 
 suite('Tools tests', () => {
   test('shellTask returns correct output', async () => {
@@ -16,4 +17,36 @@ suite('Tools tests', () => {
     const name = 'pip: fortls';
     assert.rejects(shellTask('python3', ['-m', 'pip', 'install', 'fortls2'], name));
   });
+
+  test('spawnAsPromise correct stdout, stderr output exit code 0', async () => {
+    const [stdout, stderr] = await spawnAsPromise('node', [
+      path.resolve(__dirname, './exit-code.js'),
+    ]);
+    assert.strictEqual(stdout, 'Hello World!');
+    assert.strictEqual(stderr, 'No errors');
+  });
+
+  test('spawnAsPromise correct stdout, stderr output exit code 1', async () => {
+    try {
+      const [stdout, stderr] = await spawnAsPromise('node', [
+        path.resolve(__dirname, './exit-code-err.js'),
+      ]);
+    } catch (error) {
+      const [stdout, stderr] = error;
+      assert.strictEqual(stdout, 'Hello World!');
+      assert.strictEqual(stderr, 'Errors');
+    }
+  });
+
+  test('spawnAsPromise correct stdout, stderr output exit code 1 with ignoreExitCode', async () => {
+    const [stdout, stderr] = await spawnAsPromise(
+      'node',
+      [path.resolve(__dirname, './exit-code-err.js')],
+      undefined,
+      undefined,
+      true
+    );
+    assert.strictEqual(stdout, 'Hello World!');
+    assert.strictEqual(stderr, 'Errors');
+  });
 });