Fix folder used for Integration tests (#386)

* fix working folder for integration tests

* fix datetime format

Author: lucyzhang929

test/Integration/IntegrationTestBase.cs

@@ -178,7 +178,7 @@ protected void StartAzurite()
         /// </remarks>
         protected void StartFunctionHost(string functionName, SupportedLanguages language, bool useTestFolder = false, DataReceivedEventHandler customOutputHandler = null)
         {
-            string workingDirectory = useTestFolder ? GetPathToBin() : Path.Combine(GetPathToBin(), "SqlExtensionSamples", Enum.GetName(typeof(SupportedLanguages), language));
+            string workingDirectory = language == SupportedLanguages.CSharp && useTestFolder ? GetPathToBin() : Path.Combine(GetPathToBin(), "SqlExtensionSamples", Enum.GetName(typeof(SupportedLanguages), language));
             if (!Directory.Exists(workingDirectory))
             {
                 throw new FileNotFoundException("Working directory not found at " + workingDirectory);

test/Integration/test-js/AddProductColumnTypes/index.js

@@ -5,8 +5,8 @@
 module.exports = async function (context, req) {
     const product = {
         "productId": req.query.productId,
-        "datetime": Date.now(),
-        "datetime2": Date.now()
+        "datetime": new Date().toISOString(),
+        "datetime2": new Date().toISOString()
     };
 
     context.bindings.product = JSON.stringify(product);