Remove TDD language from tutorial (#6466)

Author: guardrex

docs/core/tutorials/using-on-mac-vs-full-solution.md

@@ -9,7 +9,7 @@ ms.date: 06/12/2017
 
 Visual Studio for Mac provides a full-featured Integrated Development Environment (IDE) for developing .NET Core applications. This topic walks you through building a .NET Core solution that includes a reusable library and unit testing.
 
-This tutorial shows you how to create an application that accepts a search word and a string of text from the user, counts the number of times the search word appears in the string using a method in a class library, and returns the result to the user. The solution also includes unit testing for the class library as an introduction to test-driven development (TDD) concepts. If you prefer to proceed through the tutorial with a complete sample, download the [sample solution](https://github.com/dotnet/samples/blob/master/core/tutorials/using-on-mac-vs-full-solution/WordCounter). For download instructions, see [Samples and Tutorials](../../samples-and-tutorials/index.md#viewing-and-downloading-samples).
+This tutorial shows you how to create an application that accepts a search word and a string of text from the user, counts the number of times the search word appears in the string using a method in a class library, and returns the result to the user. The solution also includes unit testing for the class library as an introduction to unit testing concepts. If you prefer to proceed through the tutorial with a complete sample, download the [sample solution](https://github.com/dotnet/samples/blob/master/core/tutorials/using-on-mac-vs-full-solution/WordCounter). For download instructions, see [Samples and Tutorials](../../samples-and-tutorials/index.md#viewing-and-downloading-samples).
 
 > [!NOTE]
 > Your feedback is highly valued. There are two ways you can provide feedback to the development team on Visual Studio for Mac:
@@ -100,7 +100,7 @@ Unit tests provide automated software testing during your development and publis
 
    ![Initial unit test to check GetWordCount in the IDE main window](./media/using-on-mac-vs-full-solution/vsmacfull08.png)
 
-   Using TDD, it's important to make a new test fail once to confirm its testing logic is correct. The method passes in the name "Jack" (uppercase) and a string with "Jack" and "jack" (uppercase and lowercase). If the `GetWordCount` method is working properly, it returns a count of two instances of the search word. In order to fail this test on purpose, you first implement the test asserting that two instances of the search word "Jack" aren't returned by the `GetWordCount` method. Continue to the next step to fail the test on purpose.
+   It's important to make a new test fail once to confirm its testing logic is correct. The method passes in the name "Jack" (uppercase) and a string with "Jack" and "jack" (uppercase and lowercase). If the `GetWordCount` method is working properly, it returns a count of two instances of the search word. In order to fail this test on purpose, you first implement the test asserting that two instances of the search word "Jack" aren't returned by the `GetWordCount` method. Continue to the next step to fail the test on purpose.
 
 1. Open the **Unit Tests** panel on the right side of the screen.