Hi, I’m trying to convert my .net TestProject Android automation project to use SpecFlow, however I see a NullReferenceException when creating the driver on this line:
mysession = new AndroidDriver<AppiumWebElement>(token: _testProjectToken, appiumOptions: _appiumOptions, projectName: "Android", jobName: "Test");
The app opens on the device but immediately shows the following error in Visual Studio:
Object reference not set to an instance of an object.System.NullReferenceException: Object reference not set to an instance of an object.
at TestProject.OpenSDK.Internal.CallStackAnalysis.SpecFlowAnalyzer.IsSpecFlow(MethodBase method)
at TestProject.OpenSDK.Internal.CallStackAnalysis.StackTraceHelper.<>c.<TryDetectSpecFlow>b__10_1(MethodBase m)
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable1 source, Func2 predicate)
at TestProject.OpenSDK.Internal.CallStackAnalysis.StackTraceHelper.TryDetectSpecFlow()
at TestProject.OpenSDK.Drivers.Android.AndroidDriver1..ctor(Uri remoteAddress, String token, AppiumOptions appiumOptions, String projectName, String jobName, Boolean disableReports, ReportType reportType, String reportName, String reportPath, Nullable'1 remoteConnectionTimeout, Int32 restClientTimeout)
at SpecFlowProject_Two.Steps.CalculatorStepDefinitions.BeforeScenario() in \Steps\CalculatorStepDefinitions.cs:line 35
at lambda_method(Closure , IContextManager )
at TechTalk.SpecFlow.Infrastructure.TestExecutionEngine.FireEvents(HookType hookType)
at TechTalk.SpecRun.SpecFlowPlugin.Runtime.RunnerTestExecutionEngine.FireScenarioEvents(HookType bindingEvent)
at TechTalk.SpecFlow.Infrastructure.TestExecutionEngine.OnScenarioStart()
at TechTalk.SpecFlow.Infrastructure.TestExecutionEngine.OnAfterLastStep()
at TechTalk.SpecRun.SpecFlowPlugin.Runtime.RunnerTestExecutionEngine.OnAfterLastStep()
at TechTalk.SpecFlow.TestRunner.CollectScenarioErrors()
at SpecFlowProject_Two.Features.CalculatorFeature.ScenarioCleanup()
at SpecFlowProject_Two.Features.CalculatorFeature.AddTwoNumbers() in \Features\Calculator.feature:line 8
at TechTalk.SpecRun.Framework.TaskExecutors.StaticOrInstanceMethodExecutor.ExecuteInternal(ITestThreadExecutionContext testThreadExecutionContext)
at TechTalk.SpecRun.Framework.TaskExecutors.StaticOrInstanceMethodExecutor.Execute(ITestThreadExecutionContext testThreadExecutionContext)
at TechTalk.SpecRun.Framework.TestNodeTask.Execute()
The driver create code works perfectly ok if I just use TestProject without SpecFlow. I also successfully use very similar code to create tests on SpecFlow/BrowserStack projects.
Not sure if it is something I’m doing/not doing or if it is a problem in TestProject or SpecFlow (or a combination).
Any assistance would be appreciated!
What I have tried so far:
- cleared out TestProject and SpecFlow NuGet packages and reinstalled
- used different configurations of TestProject and SpecFlow NuGet packages
- deleted the bin and obj folders and rebuilt the solution
- placed the code in one file
- used a different app
I have cut the code down to use the SpecFlow Calculator demo but still get the NullReferenceException error.
Feature File
Feature: Calculator
Scenario: Add two numbers
Given the first number is 50
And the second number is 70
When the two numbers are added
Then the result should be 120
Steps Code
using OpenQA.Selenium.Appium;
using OpenQA.Selenium.Appium.Enums;
using TechTalk.SpecFlow;
using TestProject.OpenSDK.Drivers.Android;
namespace SpecFlowProject_Two.Steps
{
[Binding]
public sealed class CalculatorStepDefinitions
{
private readonly ScenarioContext _scenarioContext;
public AndroidDriver<AppiumWebElement> mysession;
public const string _androidDeviceName = "motorola-moto_g__5_-ZY3224S6TZ";
public const string _androidAppActivity = "com.android.calculator2.Calculator";
public const string _appPackage = "com.google.android.calculator";
public const string _testProjectToken = "token";
[BeforeScenario]
public void BeforeScenario()
{
if (mysession == null)
{
AppiumOptions _appiumOptions = new AppiumOptions();
_appiumOptions.AddAdditionalCapability(MobileCapabilityType.PlatformName, MobilePlatform.Android);
_appiumOptions.AddAdditionalCapability(MobileCapabilityType.PlatformVersion, "8.1.0");
_appiumOptions.AddAdditionalCapability(MobileCapabilityType.DeviceName, _androidDeviceName);
_appiumOptions.AddAdditionalCapability(AndroidMobileCapabilityType.AppPackage, _appPackage);
_appiumOptions.AddAdditionalCapability(AndroidMobileCapabilityType.AppActivity, _androidAppActivity);
mysession = new AndroidDriver<AppiumWebElement>(token: _testProjectToken, appiumOptions: _appiumOptions, projectName: "Android", jobName: "Test");
mysession.StartActivity(appPackage: _appPackage, appActivity: _androidAppActivity);
}
}
public CalculatorStepDefinitions(ScenarioContext scenarioContext)
{
_scenarioContext = scenarioContext;
}
[Given("the first number is (.*)")]
public void GivenTheFirstNumberIs(int number)
{
_scenarioContext.Pending();
}
[Given("the second number is (.*)")]
public void GivenTheSecondNumberIs(int number)
{
_scenarioContext.Pending();
}
[When("the two numbers are added")]
public void WhenTheTwoNumbersAreAdded()
{
_scenarioContext.Pending();
}
[Then("the result should be (.*)")]
public void ThenTheResultShouldBe(int result)
{
_scenarioContext.Pending();
}
[AfterScenario]
public void AfterScenario()
{
if (mysession != null)
{
mysession.Quit();
mysession = null;
}
}
}
}
Project File
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net48</TargetFramework>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.2.0" />
<PackageReference Include="SpecFlow.Plus.LivingDocPlugin" Version="3.9.57" />
<PackageReference Include="SpecRun.SpecFlow" Version="3.9.31" />
<PackageReference Include="FluentAssertions" Version="6.7.0" />
<PackageReference Include="TestProject.OpenSDK" Version="1.2.4" />
</ItemGroup>
<ItemGroup>
<Folder Include="Drivers\" />
<Folder Include="Hooks\" />
</ItemGroup>
</Project>
