image/pixels.js: add unit tests

test/unit/image/pixels.js

@@ -81,4 +81,154 @@ suite('pixels', function() {
       assert.deepEqual(img.get(25, 25.999), img.get(25, 25));
     });
   });
+
+  suite('p5.Image.pixels', function() {
+    test('should be an array of pixels', function() {
+      let img = myp5.createImage(10, 10);
+      img.loadPixels();
+      assert.typeOf(img.pixels, 'Uint8ClampedArray');
+    });
+
+    test('should store r, g, b, a values for each pixel', function() {
+      let img = myp5.createImage(10, 10);
+      myp5.pixelDensity(1);
+      img.loadPixels();
+      assert.strictEqual(img.pixels.length, 400);
+    });
+
+    test('should store correct r, g, b, a values for each pixel', function() {
+      let img = myp5.createImage(10, 10);
+      myp5.pixelDensity(1);
+      img.loadPixels();
+      img.pixels[0] = 255;
+      img.pixels[1] = 102;
+      img.pixels[2] = 204;
+      img.pixels[3] = 255;
+      img.updatePixels();
+
+      assert.strictEqual(img.pixels[0], 255);
+      assert.strictEqual(img.pixels[1], 102);
+      assert.strictEqual(img.pixels[2], 204);
+      assert.strictEqual(img.pixels[3], 255);
+    });
+  });
+
+  suite('p5.Image.set', function() {
+    /* Parameter Validation missing */
+    test('set(x,y) changes color of pixel (x, y)', function() {
+      let img = myp5.createImage(50, 50);
+      img.loadPixels();
+      img.set(0, 0, myp5.color(255, 34, 19));
+      img.updatePixels();
+      assert.deepEqual(img.get(0, 0), [255, 34, 19, 255]);
+    });
+  });
+
+  suite('p5.Image.blend', function() {
+    test('should copy a region of pixels using the specified blend mode', function() {
+      let img = myp5.createImage(50, 50);
+      let img2 = myp5.createImage(50, 50);
+      img.loadPixels();
+      for (let i = 0; i < img.width; i++) {
+        for (let j = 0; j < img.height; j++) {
+          img.set(i, j, myp5.color(255, 0, 0)); // red
+        }
+      }
+      img.updatePixels();
+      img2.loadPixels();
+      for (let i = 0; i < img2.width; i++) {
+        for (let j = 0; j < img2.height; j++) {
+          img2.set(i, j, myp5.color(255, 255, 0)); // yellow
+        }
+      }
+      img2.updatePixels();
+      img.blend(img2, 0, 0, 10, 10, 0, 0, 10, 10, myp5.NORMAL); // blend yellow on red in normal mode
+      myp5.image(img, 0, 0);
+
+      for (let i = 0; i < 10; i++) {
+        for (let j = 0; j < 10; j++) {
+          assert.deepEqual(img.get(i, j), [255, 255, 0, 255]); // should be yellow
+        }
+      }
+    });
+
+    test('wrong parameter at #8', function() {
+      assert.validationError(function() {
+        let img = myp5.createImage(50, 50);
+        img.blend(0, 0, 10, 10, 10, 0, 10, 10, 'a');
+      });
+    });
+
+    test('no friendly-err-msg. missing param #0', function() {
+      assert.doesNotThrow(
+        function() {
+          let img = myp5.createImage(50, 50);
+          img.blend(0, 0, 10, 10, 10, 0, 10, 10, myp5.OVERLAY);
+        },
+        Error,
+        'got unwanted exception'
+      );
+    });
+
+    test('missing parameter at #3 ', function() {
+      assert.throw(function() {
+        let img = myp5.createImage(50, 50);
+        img.blend(0, 0, 10, 10, 0, 10, 10, myp5.OVERLAY);
+      });
+    });
+
+    test('missing parameter at #8 ', function() {
+      assert.throw(function() {
+        let img = myp5.createImage(50, 50);
+        img.blend(0, 0, 10, 10, 10, 0, 10, 10);
+      });
+    });
+  });
+
+  suite('p5.Image.copy', function() {
+    test('should copy a region of pixels', function() {
+      let img = myp5.createImage(50, 50);
+      let img2 = myp5.createImage(50, 50);
+      img.loadPixels();
+      for (let i = 0; i < img.width; i++) {
+        for (let j = 0; j < img.height; j++) {
+          img.set(i, j, myp5.color(255, 0, 0)); // red
+        }
+      }
+      img.updatePixels();
+      img2.loadPixels();
+      for (let i = 0; i < img2.width; i++) {
+        for (let j = 0; j < img2.height; j++) {
+          img2.set(i, j, myp5.color(0, 255, 0)); // green
+        }
+      }
+      img2.updatePixels();
+      img.copy(img2, 0, 0, 10, 10, 0, 0, 10, 10); // copy green on red
+      myp5.image(img, 0, 0);
+
+      for (let i = 0; i < 10; i++) {
+        for (let j = 0; j < 10; j++) {
+          assert.deepEqual(img.get(i, j), [0, 255, 0, 255]); // should be green
+        }
+      }
+    });
+
+    test('no friendly-err-msg. missing param #0', function() {
+      assert.doesNotThrow(
+        function() {
+          let img = myp5.createImage(50, 50);
+          img.copy(0, 0, 10, 10, 10, 0, 10, 10);
+        },
+        Error,
+        'got unwanted exception'
+      );
+    });
+
+    test('missing parameter at #3 ', function() {
+      assert.throw(function() {
+        let img = myp5.createImage(50, 50);
+        img.copy(0, 0, 10, 10, 0, 10, 10);
+      }, 'Signature not supported');
+    });
+  });
 });