Add documentation about the TestContext

[Evangelink]

Fixes microsoft/testfx#4040

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Internal previews

📄 File	🔗 Preview link
docs/core/testing/unit-testing-mstest-writing-tests-testcontext.md	The TestContext class
docs/core/testing/unit-testing-mstest-writing-tests.md	Write tests with MSTest
docs/navigate/devops-testing/toc.yml	docs/navigate/devops-testing/toc

[gewarren]

Thanks for adding this. It would be ideal if you can add the longer code snippets to a project so it's automatically verified to compile.

[gewarren]

Suggested change

	You can learn about [accessing the `TestContext` object](./unit-testing-mstest-writing-tests-testcontext.md#accessing-the-testcontext-object) or [the `TestContext` members](./unit-testing-mstest-writing-tests-testcontext.md#the-testcontext-members).
	For more information, see [Accessing the `TestContext` object](./unit-testing-mstest-writing-tests-testcontext.md#accessing-the-testcontext-object) or [The `TestContext` members](./unit-testing-mstest-writing-tests-testcontext.md#the-testcontext-members).

[gewarren]

Suggested change

	The `TestContext` class provides contextual information and support for test execution, making it easier to retrieve information about the test run and manipulate aspects of the environment. It's defined in the `Microsoft.VisualStudio.TestTools.UnitTesting` namespace and is available when using the MSTest Framework.
	The <xref:Microsoft.VisualStudio.TestTools.UnitTesting.TestContext> class provides contextual information and support for test execution, making it easier to retrieve information about the test run and manipulate aspects of the environment. It's defined in the <xref:Microsoft.VisualStudio.TestTools.UnitTesting> namespace and is available when using the MSTest Framework.

[gewarren]

Suggested change

	The `TestContext` class provides contextual information and support for test execution, making it easier to retrieve information about the test run and manipulate aspects of the environment. It's defined in the `Microsoft.VisualStudio.TestTools.UnitTesting` namespace and is available when using the MSTest Framework.
	The <xref:Microsoft.VisualStudio.TestTools.UnitTesting.TestContext> class provides contextual information and support for test execution, making it easier to retrieve information about the test run and manipulate aspects of the environment. It's defined in the <xref:Microsoft.VisualStudio.TestTools.UnitTesting> namespace and is available when using the MSTest Framework.

[gewarren]

Suggested change

	The `TestContext` object is available in the following contexts:
	The <xref:Microsoft.VisualStudio.TestTools.UnitTesting.TestContext> object is available in the following contexts:

[gewarren]

Suggested change

	or with MSTest 3.6+
	Or with MSTest 3.6+:

[gewarren]

Suggested change

	- `TestException` - the exception thrown by either the test method or test initialize or `null` if the test method did not throw an exception.
	- `TestException` - the exception thrown by either the test method or test initialize, or `null` if the test method did not throw an exception.

[gewarren]

Suggested change

	Assuming the following CSV file `TestData.csv`:
	Consider the following CSV file `TestData.csv`:

[gewarren]

Suggested change

	### Storing and Retrieving Runtime Data
	### Store and retrieve runtime data

[gewarren]

Suggested change

	### Associating data to a test
	### Associate data to a test

[gewarren]

Suggested change

	The `TestContext.AddResultFile` method allows you to add a file to the test results, making it available for review in the test output. This can be useful if you generate files during your test (e.g., log files, screenshots, or data files) that you want to attach to the test results.
	The `TestContext.AddResultFile` method allows you to add a file to the test results, making it available for review in the test output. This can be useful if you generate files during your test (for example, log files, screenshots, or data files) that you want to attach to the test results.