diff --git a/.gitignore b/.gitignore
index b512c09..7cafbdb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
+coverage
 node_modules
\ No newline at end of file
diff --git a/.npmignore b/.npmignore
index 71493a0..148061d 100644
--- a/.npmignore
+++ b/.npmignore
@@ -1,5 +1,6 @@
 .DS_Store
 .gitignore
+coverage
 src
 tests
 yarn.lock
\ No newline at end of file
diff --git a/tests/index.test.js b/tests/index.test.js
index 4595f06..fbf283b 100644
--- a/tests/index.test.js
+++ b/tests/index.test.js
@@ -12,17 +12,28 @@ fetch.mockResponses(
   [ new Error('404 Not Found'), { status: 404 } ]
 );
 
-const mockFetch = fetchMultiple(mockUrls);
+const resolvingFetch = fetchMultiple(mockUrls);
+
+fetch.mockReject('404 Not Found');
+const failingFetch = fetchMultiple({ '/undefined.text': 'text' });
 
 it('works as a promise', () => {
-  expect(mockFetch.resolves);
+  expect(resolvingFetch.resolves);
 });
 
-it('returns the correct values', () => {
-  expect(mockFetch.then(data => {
+it('returns the correct values for functional endpoints', () => {
+  expect(resolvingFetch.then(data => {
     return data === {
       '/data.json': { data: true },
       'text.txt': 'Some example text'
     }
   }));
+});
+
+it('returns an error for failing endpoints', () => {
+  expect(failingFetch.then(data => {
+    return data === {
+      '/undefined.text': '404 Not Found'
+    }
+  }));
 });
\ No newline at end of file