Add tests

spec/spec/pointarray.js

@@ -0,0 +1,28 @@
+describe('PointArray', function() {
+  const squareString = '0,0 1,0 1,1 0,1';
+  const square = new SVG.PointArray(squareString)
+
+  describe('toString()', function() {
+    it('round trips with string', () => {
+      expect(square.toString()).toEqual(squareString)
+    })
+  })
+
+  describe('transform()', function() {
+    it('translates correctly', () => {
+      const translation = new SVG.Matrix().translate(2,1)
+      const newSquare = square.transform(translation)
+      expect(newSquare.toString()).toEqual('2,1 3,1 3,2 2,2')
+    })
+
+    it('transforms like Point', () => {
+      const matrix = new SVG.Matrix(1, 2, 3, 4, 5, 6)
+      const newSquare = square.transform(matrix)
+      for (let i = 0; i < square.length; i++) {
+        const squarePoint = new SVG.Point(square[i])
+        const newSquarePoint = new SVG.Point(newSquare[i])
+        expect(squarePoint.transform(matrix)).toEqual(newSquarePoint)
+      }
+    })
+  })
+})