Jest tests: Add Babel support.

- Can now be run simply with $ yarn run jest

Author: NickSto

babel.config.json

@@ -0,0 +1,9 @@
+{
+    "presets": [
+        [
+            "@babel/preset-env", {
+                "targets": {"node": "current"}
+            }
+        ]
+    ]
+}

package.json

@@ -75,10 +75,17 @@
       "node"
     ],
     "testMatch": [
-        "**/?(*.)test.?js"
+      "**/?(*.)test.?js"
     ],
     "testPathIgnorePatterns": [
-        "/node_modules/", "/cypress/"
+      "/node_modules/",
+      "/cypress/"
+    ],
+    "transform": {
+      "^.+\\.m?js$": "babel-jest"
+    },
+    "transformIgnorePatterns": [
+      "\\.pnp\\.[^\\/]+$"
     ]
   }
 }