add unit test for getSimilarConnectedPixelsFromFrame

test/js/utils/PixelUtilsTest_visit_connected.js

@@ -0,0 +1,47 @@
+describe("PixelUtils visitor methods tests", function() {
+  var black = '#000000';
+  var red = '#ff0000';
+  var transparent = Constants.TRANSPARENT_COLOR;
+  var B = black, R = red, T = transparent;
+
+  beforeEach(function() {});
+  afterEach(function() {});
+
+  var containsPixel = function (pixels, col, row) {
+    return pixels.some(function (p) {
+      return p.col === col && p.row === row;
+    });
+  };
+
+  it("getSimilarConnectedPixelsFromFrame works", function() {
+    // single point
+    var frame = pskl.model.Frame.fromPixelGrid(test.testutils.toFrameGrid([
+      [T, T, B],
+      [B, T, B],
+      [T, T, B],
+    ]));
+
+    var pixels = pskl.PixelUtils.getSimilarConnectedPixelsFromFrame(frame, 0, 0);
+    expect(pixels.length).toBe(5);
+    expect(containsPixel(pixels, 0, 0)).toBe(true);
+    expect(containsPixel(pixels, 1, 0)).toBe(true);
+    expect(containsPixel(pixels, 1, 1)).toBe(true);
+    expect(containsPixel(pixels, 0, 2)).toBe(true);
+    expect(containsPixel(pixels, 1, 2)).toBe(true);
+
+    pixels = pskl.PixelUtils.getSimilarConnectedPixelsFromFrame(frame, -1, -1);
+    expect(Array.isArray(pixels)).toBe(true);
+    expect(pixels.length).toBe(0);
+
+    pixels = pskl.PixelUtils.getSimilarConnectedPixelsFromFrame(frame, 0, 1);
+    expect(pixels.length).toBe(1);
+    expect(containsPixel(pixels, 0, 1)).toBe(true);
+
+    pixels = pskl.PixelUtils.getSimilarConnectedPixelsFromFrame(frame, 2, 1);
+    expect(pixels.length).toBe(3);
+    expect(containsPixel(pixels, 2, 0)).toBe(true);
+    expect(containsPixel(pixels, 2, 1)).toBe(true);
+    expect(containsPixel(pixels, 2, 2)).toBe(true);
+
+  });
+});