Merge pull request #3894 from scout208/patch-3

Update unit-testing-visual-csharp-code-in-a-store-app.md

Author: gewarren

docs/test/unit-testing-visual-csharp-code-in-a-store-app.md

@@ -161,7 +161,7 @@ You have set up the test and the code projects, and verified that you can run te
        {
            double expected = v;
            double actual = rooter.SquareRoot(v*v);
-           double tolerance = ToleranceHelper(expected);
+           double tolerance = expected/1000;
            Assert.AreEqual(expected, actual, tolerance);
        }
    }
@@ -318,4 +318,4 @@ Note that the `RangeTest` method hard codes the denominator of the `tolerance` v
 2. Choose **Run All** to test the refactored method and make sure that you haven't introduced an error.
 
 > [!NOTE]
-> If you add a helper method to a test class that you don't want to appear in **Test Explorer**, do not add the <xref:Microsoft.VisualStudio.TestTools.UnitTesting.TestMethodAttribute> attribute to the method.
+> If you add a helper method to a test class that you don't want to appear in **Test Explorer**, do not add the <xref:Microsoft.VisualStudio.TestTools.UnitTesting.TestMethodAttribute> attribute to the method.