test: consolidate duplicated code

Author: KevinEady

test/binding.gyp

@@ -35,9 +35,9 @@
         'object/set_property.cc',
         'promise.cc',
         'run_script.cc',
-        'threadsafe_function_ex/basic.cc',
-        'threadsafe_function_ex/example.cc',
-        'threadsafe_function_ex/threadsafe.cc',
+        'threadsafe_function_ex/test/basic.cc',
+        'threadsafe_function_ex/test/example.cc',
+        'threadsafe_function_ex/test/threadsafe.cc',
         'threadsafe_function/threadsafe_function_ctx.cc',
         'threadsafe_function/threadsafe_function_existing_tsfn.cc',
         'threadsafe_function/threadsafe_function_ptr.cc',

test/threadsafe_function_ex/index.js

@@ -1,5 +1,5 @@
 const tests = [
-    // 'threadsafe', 
+    'threadsafe', 
     'basic', 
     'example'
 ];