Add test for `Attachments.readData`

test/app/attachments_test.js

@@ -35,6 +35,33 @@ describe('Attachments', () => {
       const inputBuffer = Buffer.from(input);
       assert.deepEqual(inputBuffer, output);
     });
+  });
+
+  describe('readData', () => {
+    let tempRootDirectory = null;
+    before(() => {
+      tempRootDirectory = tmp.dirSync().name;
+    });
+
+    after(async () => {
+      await fse.remove(tempRootDirectory);
+    });
+
+    it('should read file from disk', async () => {
+      const tempDirectory = path.join(tempRootDirectory, 'Attachments_readData');
+
+      const relativePath = Attachments.getRelativePath(Attachments.createName());
+      const fullPath = path.join(tempDirectory, relativePath);
+      const input = stringToArrayBuffer('test string');
+
+      const inputBuffer = Buffer.from(input);
+      await fse.ensureFile(fullPath);
+      await fse.writeFile(fullPath, inputBuffer);
+      const output = await Attachments.readData(tempDirectory)(relativePath);
+
+      assert.deepEqual(input, output);
+    });
+  });
 
   describe('createName', () => {
     it('should return random file name with correct length', () => {
@@ -48,5 +75,4 @@ describe('Attachments', () => {
       assert.lengthOf(Attachments.getRelativePath(name), PATH_LENGTH);
     });
   });
-  });
 });