Travis build: 613 [custom]

test/heronArea/heronArea.js

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+const heronArea = (side_a, side_b, side_c) => {
+    const p = (side_a + side_b + side_c) / 2
+    return Math.sqrt(p * (p-side_a) * (p-side_b) * (p-side_c))
+  };
+module.exports = heronArea;

test/heronArea/heronArea.test.js

@@ -0,0 +1,6 @@
+const expect = require('expect');
+const heronArea = require('./heronArea.js');
+
+test('heronArea is a Function', () => {
+  expect(heronArea).toBeInstanceOf(Function);
+});