Added test to ensure console.warn called on error in loadImage().

Author: billmalarky

tests/CacheableImage.test.js

@@ -296,6 +296,40 @@ describe('CacheableImage', function() {
 
   });
 
+  it('#_loadImage should warn developer on error getting local file path.', () => {
+
+    // Verify source uri prop only accepts web accessible urls.
+
+    const CacheableImage = imageCacheHoc(Image);
+
+    const imageUrl = 'https://img.wennermedia.com/5333a62d-07db-432a-92e2-198cafa38a14-326adb1a-d8ed-4a5d-b37e-5c88883e1989.png';
+
+    const cacheableImage = new CacheableImage({ // eslint-disable-line no-unused-vars
+      source: {
+        uri: imageUrl
+      }
+    });
+
+    const testError = new Error('Test error');
+
+    cacheableImage.fileSystem.getLocalFilePathFromUrl = () => {
+      throw testError;
+    };
+
+    // Cache console.warn
+    const consoleWarnCache = console.warn; // eslint-disable-line no-console
+
+    console.warn = sinon.spy(); // eslint-disable-line no-console
+
+    cacheableImage._loadImage(imageUrl);
+
+    console.warn.should.be.calledWithExactly(testError); // eslint-disable-line no-console
+
+    // Re-apply console.warn
+    console.warn = consoleWarnCache; // eslint-disable-line no-console
+
+  });
+
   it('#render with valid props does not throw an error.', () => {
 
     const CacheableImage = imageCacheHoc(Image);