Update test framework: fix run_tests.py to support all test files, add auto-import-check for test files

node_modules/jsondiffpatch/lib/contexts/patch.js

@@ -0,0 +1,10 @@
+import Context from './context.js';
+class PatchContext extends Context {
+    constructor(left, delta) {
+        super();
+        this.left = left;
+        this.delta = delta;
+        this.pipe = 'patch';
+    }
+}
+export default PatchContext;