move node test suite into its own grunt command

tests/node/assertionHandler.mjs

@@ -0,0 +1,60 @@
+/**
+ * assertionHandler.mjs
+ *
+ * Pair native node assertions with a description for
+ * the benefit of the TestRegister.
+ *
+ * @author d98762625 [d98762625@gmail.com]
+ * @copyright Crown Copyright 2019
+ * @license Apache-2.0
+ */
+
+/* eslint no-console: 0 */
+
+
+/**
+ * Print useful stack on error
+ */
+const wrapRun = (run) => () => {
+    try {
+        run();
+    } catch (e) {
+        console.dir(e);
+        throw e;
+    }
+};
+
+
+/**
+ * it - wrapper for assertions to provide a helpful description
+ * to the TestRegister
+ * @namespace ApiTests
+ * @param {String} description - The description of the test
+ * @param {Function} assertion - The test
+ *
+ * @example
+ * // One assertion
+ * it("should run one assertion", () => assert.equal(1,1))
+ *
+ * @example
+ * // multiple assertions
+ * it("should handle multiple assertions", () => {
+ *   assert.equal(1,1)
+ *   assert.notEqual(3,4)
+ * })
+ *
+ * @example
+ * // async assertions
+ * it("should handle async", async () => {
+ *      let r = await asyncFunc()
+ *      assert(r)
+ * })
+ */
+export function it(name, run) {
+    return {
+        name: `Node API: ${name}`,
+        run: wrapRun(run),
+    };
+}
+
+export default it;