Testing improvements (#4863)

* Adds supports-color so spec reporter dont output colors when not supported

* Adds babelrc so breakpoints dont jump around in specs

* Rename test to avoid duplicated name

* Removes unused methods

* Better naming for it_exclude

spec/.babelrc

@@ -0,0 +1,14 @@
+{
+    "plugins": [
+        "transform-object-rest-spread"
+    ],
+    "presets": [
+        ["env", {
+            "targets": {
+                "node": "8"
+            }
+        }]
+    ],
+    "sourceMaps": "inline",
+    "retainLines": true
+}