test(axis_utils.test.ts): add test to confirm positive padding

rshen91 · rshen91 · commit 1507d9cafe69 · 2019-06-25T08:15:18.000-06:00
diff --git a/src/lib/axes/axis_utils.test.ts b/src/lib/axes/axis_utils.test.ts
@@ -1272,4 +1272,15 @@ describe('Axis computational utils', () => {
     expect(isBounded(lowerBounded)).toBe(true);
     expect(isBounded(upperBounded)).toBe(true);
   });
+  test('should not allow negative padding', () => {
+    const negativePadding = -2;
+    // value canvas_text_bbox_calculator changes negative values is 1
+    const positivePadding = 1;
+
+    const bboxCalculator = new CanvasTextBBoxCalculator();
+    const negativeReducer = getMaxBboxDimensions(bboxCalculator, 16, 'Arial', 0, negativePadding);
+    const positiveReducer = getMaxBboxDimensions(bboxCalculator, 16, 'Arial', 0, positivePadding);
+
+    expect(JSON.stringify(negativeReducer)).toEqual(JSON.stringify(positiveReducer));
+  });
 });
