Fix flaky E2E tests (#83)

This test always failed when running `Start-E2ETest.ps1` without setting
`AzureWebJobsStorage` environment variable:

>
AzureFunctions.PowerShell.Durable.SDK.E2E.ActivityTests.ActivityCanHaveQueueBinding
(3ms): Error Message: System.TypeInitializationException : The type
initializer for
'AzureFunctions.PowerShell.Durable.SDK.Tests.E2E.StorageHelpers' threw
an exception.
> ---- System.ArgumentNullException : Value cannot be null. (Parameter
'connectionString')

The following test failed intermittently. I believe it was checking for
a wrong condition in `validateIntermediateResponse`, and it passed only
when this condition was not even evaluated (which depends on timing):

> AzureFunctions.PowerShell.Durable.SDK.E2E\DurableClientTests.cs(243):
error TESTERROR:
>
AzureFunctions.PowerShell.Durable.SDK.E2E.DurableClientTests.DurableClientSuspendOrchestration
(15s 99ms): Error M essage: Assert.Equal() Failure
>                ↓ (pos 0)
>      Expected: Suspended
>      Actual:   Running
>                ↑ (pos 0)
>      Stack Trace:
> at
AzureFunctions.PowerShell.Durable.SDK.E2E.DurableClientTests.<>c.<DurableClientSuspendOrchestration>b__7_0(Object
intermediateStatusResponseBody) in
Q:\Projects\Durable\Versioning\powershell\azure-functions-durable-powershell\test\E2E\AzureFunctions.PowerShell.Durable.SDK.E2E\DurableClientTests.cs:line
243

Author: AnatoliB

test/E2E/AzureFunctions.PowerShell.Durable.SDK.E2E/DurableClientTests.cs

@@ -240,8 +240,10 @@ await ValidateDurableWorkflowResults(
                 initialResponse,
                 validateIntermediateResponse: (dynamic intermediateStatusResponseBody) =>
                 {
-                    Assert.Equal("Suspended", (string)intermediateStatusResponseBody.runtimeStatus);
-                    Assert.Equal("Suspend orchestrator", (string)intermediateStatusResponseBody.output);
+                    var runtimeStatus = (string)intermediateStatusResponseBody.runtimeStatus;
+                    Assert.True(
+                        runtimeStatus == "Running" || runtimeStatus == "Suspended",
+                        $"Unexpected runtime status: {runtimeStatus}");
                 });
 
             await ValidateDurableWorkflowResults(

test/E2E/Start-E2ETest.ps1

@@ -81,6 +81,11 @@ $Env:AZURE_FUNCTIONS_ENVIRONMENT = "Development"
 $env:ExternalDurablePowerShellSDK = $true
 Write-Host "Set ExternalDurablePowerShellSDK environment variable to $env:ExternalDurablePowerShellSDK"
 
+if (-not $env:AzureWebJobsStorage) {
+    $env:AzureWebJobsStorage = "UseDevelopmentStorage=true"
+    Write-Host "Set AzureWebJobsStorage environment variable to $env:AzureWebJobsStorage"
+}
+
 $arch = [System.Runtime.InteropServices.RuntimeInformation]::OSArchitecture.ToString().ToLowerInvariant()
 if ($IsWindows) {
     $FUNC_EXE_NAME = "$FUNC_CMDLET_NAME.exe"