scaffolder-backend: added some basic tests for SecureTemplater

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/scaffolder-backend/src/lib/templating/SecureTemplater.test.ts

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2021 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { SecureTemplater } from './SecureTemplater';
+
+describe('SecureTemplater', () => {
+  it('should render some templates', async () => {
+    const templater = new SecureTemplater();
+    await expect(
+      templater.render('${{ test }}', { test: 'my-value' }),
+    ).resolves.toBe('my-value');
+
+    await expect(
+      templater.render('${{ test | dump }}', { test: 'my-value' }),
+    ).resolves.toBe('"my-value"');
+
+    await expect(
+      templater.render('${{ test | replace("my-", "our-") }}', {
+        test: 'my-value',
+      }),
+    ).resolves.toBe('our-value');
+
+    await expect(
+      templater.render('${{ invalid...syntax }}', {
+        test: 'my-value',
+      }),
+    ).rejects.toThrow(
+      '(unknown path) [Line 1, Column 13]\n  expected name as lookup value, got .',
+    );
+  });
+});