Fix tests · sualeh/introduction-to-mutation-testing@a048d26

.NET build and run tests: C#/TestPalindrome/PalindromeTest.cs#L15

'Assert' does not contain a definition for 'IsTrue'

.NET build and run tests: C#/TestPalindrome/MorePalindromeTest.cs#L15

'Assert' does not contain a definition for 'IsFalse'

.NET build and run tests: C#/TestPalindrome/PalindromeTest.cs#L21

'Assert' does not contain a definition for 'IsTrue'

.NET build and run tests: C#/TestPalindrome/PalindromeTest.cs#L27

'Assert' does not contain a definition for 'IsTrue'

.NET build and run tests: C#/TestPalindrome/PalindromeTest.cs#L33

'Assert' does not contain a definition for 'IsTrue'

.NET build and run tests: C#/TestPalindrome/PalindromeTest.cs#L39

'Assert' does not contain a definition for 'IsTrue'

.NET build and run tests: C#/TestPalindrome/PalindromeTest.cs#L45

'Assert' does not contain a definition for 'IsFalse'

.NET build and run tests: C#/TestPalindrome/PalindromeTest.cs#L15

'Assert' does not contain a definition for 'IsTrue'

.NET build and run tests: C#/TestPalindrome/MorePalindromeTest.cs#L15

'Assert' does not contain a definition for 'IsFalse'

.NET build and run tests: C#/TestPalindrome/PalindromeTest.cs#L21

'Assert' does not contain a definition for 'IsTrue'

.NET build and run tests: C#/TestPalindrome/PalindromeTest.cs#L15

Cannot convert null literal to non-nullable reference type.

.NET build and run tests: C#/TestPalindrome/PalindromeTest.cs#L15

Cannot convert null literal to non-nullable reference type.

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