Adds error handling for UrlFile

src/models/file.model.test.ts

@@ -0,0 +1,50 @@
+import {UrlFile} from './file.model';
+
+describe('file.model', () => {
+  test('canary verifies test infrastructure', () => {
+    expect(true).toBe(true);
+  });
+
+  describe('given UrlFile', () => {
+    describe('when url is null', () => {
+      test('then should throw error', async () => {
+        const name = 'test.out';
+
+        const file = new UrlFile({name, url: undefined as any});
+
+        return file.contents.then(
+          result => expect(result).toBeUndefined(),
+          err => expect(err.message).toEqual('Url is missing for file: ' + name)
+        );
+      });
+    });
+
+    describe('when url is invalid', () => {
+      test('then should throw error', async () => {
+        const name = 'test.out';
+        const url = 'https://bogus-url.com';
+
+        const file = new UrlFile({name, url});
+
+        return file.contents.then(
+          result => expect(result).toBeUndefined(),
+          err => expect(err.message).toEqual('Error retrieving file ' + name + ' from url: ' + url)
+        );
+      });
+    });
+
+    describe('when url is valid', () => {
+      test('then should return contents', async () => {
+        const name = 'test.out';
+        const url = 'https://google.com';
+
+        const file = new UrlFile({name, url});
+
+        return file.contents.then(
+          result => expect(result).toBeDefined(),
+          err => expect(err).toBeUndefined(),
+        );
+      });
+    });
+  });
+})

src/models/file.model.ts

@@ -24,10 +24,18 @@ export class UrlFile implements OutputFile {
   }
 
   get contents(): Promise<string | Buffer> {
-    return new Promise<string>(async (resolve) => {
-      const req: superagent.Response = await superagent.get(this.url);
+    if (!this.url) {
+      return Promise.reject(new Error('Url is missing for file: ' + this.name));
+    }
 
-      resolve(req.text);
+    return new Promise<string>(async (resolve, reject) => {
+      try {
+        const req: superagent.Response = await superagent.get(this.url);
+
+        resolve(req.text);
+      } catch (e) {
+        reject(new Error('Error retrieving file ' + this.name + ' from url: ' + this.url));
+      }
     });
   }
 }