Add tests for errorPixelTransform [#137]

nodejs-tests/compareImages.test.js

@@ -19,14 +19,14 @@ describe("compareImages", () => {
         expect(buffer.length).toBe(91876);
 
         const comparison = fs.readFileSync(
-            "./nodejs-tests/PeopleComparedToPeople2.png"
+            "./nodejs-tests/assets/PeopleComparedToPeople2.png"
         );
 
         expect(buffer.equals(comparison)).toBe(true);
 
         const buffer2 = data.getBuffer(true);
         const comparison2 = fs.readFileSync(
-            "./nodejs-tests/PeopleComparedToPeople2WithOriginal.png"
+            "./nodejs-tests/assets/PeopleComparedToPeople2WithOriginal.png"
         );
         expect(buffer2.equals(comparison2)).toBe(true);
     });

nodejs-tests/errorPixelTransform.test.js

@@ -0,0 +1,49 @@
+/* eslint-env jest*/
+
+const resemble = require('../resemble');
+const fs = require('fs');
+
+const testErrorPixelTransform = transform => {
+    const people = fs.readFileSync('./demoassets/ghost1.png');
+    const people2 = fs.readFileSync('./demoassets/ghost2.png');
+
+    return new Promise(resolve => {
+        resemble.outputSettings({
+            errorType: transform,
+            errorColor: {
+                red: 255,
+                green: 255,
+                blue: 0
+            }
+        });
+
+        resemble(people)
+            .compareTo(people2)
+            .onComplete(data => {
+                const buffer = data.getBuffer();
+
+                expect(buffer).toBeInstanceOf(Buffer);
+
+                const comparison = fs.readFileSync(
+                    `./nodejs-tests/assets/pixelErrorTransform/${transform}.png`
+                );
+
+                expect(buffer.equals(comparison)).toBe(true);
+                resolve();
+            });
+    });
+};
+
+describe('errorPixelTransform', () => {
+    test('flat', async () => testErrorPixelTransform('flat'));
+
+    test('movement', async () => testErrorPixelTransform('movement'));
+
+    test('flatDifferenceIntensity', async () =>
+        testErrorPixelTransform('flatDifferenceIntensity'));
+
+    test('movementDifferenceIntensity', async () =>
+        testErrorPixelTransform('movementDifferenceIntensity'));
+
+    test('diffOnly', async () => testErrorPixelTransform('diffOnly'));
+});

nodejs-tests/resemble.test.js

@@ -166,7 +166,7 @@ describe("resemble", () => {
                     expect(buffer.length).toBe(9429);
 
                     const comparison = fs.readFileSync(
-                        "./nodejs-tests/pixelErrorColorTest.png"
+                        "./nodejs-tests/assets/pixelErrorColorTest.png"
                     );
 
                     expect(buffer.equals(comparison)).toBe(true);