FAQ about parameterized testing

Fixes #170

Author: sgravrock

_faq/testing/parameterized.md

@@ -0,0 +1,25 @@
+---
+question: Does Jasmine support parameterized testing?
+---
+
+Not directly. But test suites are just JavaScript, so you can do it anyway.
+
+```javascript
+function add(a, b) {
+    return a + b;
+}
+
+describe('add', function() {
+    const cases = [
+        {first: 3, second: 3, sum: 6},
+        {first: 10, second: 4, sum: 14},
+        {first: 7, second: 1, sum: 8}
+    ];
+
+    for (const {first, second, sum} of cases) {
+        it(`returns ${sum} for ${first} and ${second}`, function () {
+            expect(add(first, second)).toEqual(sum);
+        });
+    }
+});
+```