[Cloud Apps] Unit Testing (#4708)

* add unit tests

* typo

src/__data__/images.ts

@@ -252,3 +252,30 @@ export const images: Linode.Image[] = [
     description: null
   }
 ];
+
+export const privateImages: Linode.Image[] = [
+  {
+    created_by: 'linode',
+    deprecated: false,
+    id: 'linode/debian8.7',
+    vendor: 'Debian',
+    size: 1100,
+    type: 'manual',
+    created: '2017-08-15T22:28:13',
+    is_public: false,
+    label: 'Debian 8.7',
+    description: null
+  },
+  {
+    created_by: 'linode',
+    deprecated: false,
+    id: 'linode/containerlinux',
+    vendor: 'CoreOS',
+    size: 3000,
+    type: 'manual',
+    created: '2017-08-15T22:28:13',
+    is_public: false,
+    label: 'Container Linux',
+    description: null
+  }
+];

src/features/linodes/LinodesCreate/TabbedContent/formUtilities.test.ts

@@ -0,0 +1,37 @@
+import { images, privateImages } from 'src/__data__/images';
+import { filterPublicImages, filterUDFErrors } from './formUtilities';
+
+describe('Linode Create Utilities', () => {
+  it('should filter out public Images', () => {
+    const filteredImages = filterPublicImages([...images, ...privateImages]);
+    expect(
+      filteredImages.every(eachImage => !!eachImage.is_public)
+    ).toBeTruthy();
+  });
+
+  it('should filter out all errors except UDF errors', () => {
+    const mockErrors: Linode.ApiFieldError[] = [
+      {
+        field: 'label',
+        reason: 'label is required'
+      },
+      {
+        field: 'ssh_keys',
+        reason: 'ssh_keys are required'
+      },
+      {
+        field: 'wp_password',
+        reason: 'a value for the UDF is required'
+      }
+    ];
+
+    const errorResources = {
+      label: 'A label',
+      ssh_keys: 'ssh_keys'
+    };
+
+    const filteredErrors = filterUDFErrors(errorResources, mockErrors);
+    expect(filteredErrors[0].field).toBe('wp_password');
+    expect(filteredErrors).toHaveLength(1);
+  });
+});

src/features/linodes/LinodesCreate/TabbedContent/formUtilities.ts

@@ -9,7 +9,7 @@ export const filterPublicImages = (images: Linode.Image[]) => {
 };
 
 /**
- * filter out all the UDF errors from our error state.
+ * filter out all the API errors that aren't UDF errors from our error state.
  * To do this, we compare the keys from the error state to our "errorResources"
  * map and return all the errors that don't match the keys in that object
  *