Background

There are many useful static methods in the .NET String class. For example, String.IsNullOrEmpty. While most String methods are used in object-oriented form (e.g., value.Substring]), the half-dozen or so that are not seem out of place and somewhat awkward.

Requirements

Create extension methods and unit test for the following String static methods:

• Compare
• CompareOrdinal
• Concat (does this make sense?)
• Format
• Join (maybe select variants)
• IsNullOrEmpty
• IsNullOrWhiteSpace

Background

There are several typos in ConversionExtensionsTests.cs:

• The class name is mispelled.
• Several test methods have returns misspelled (the r is missing)

Background

There are many useful static methods in the .NET Char class. For example, String.IsLetter.

Requirements

Create extension methods and unit test for the following String static methods:

• ConvertFromUtf32
• ConvertToUtf32
• GetNumericValue
• GetUnicodeCategory
• IsAscii
• IsAsciiDigit
• IsAsciiHexDigit
• IsAsciiHexDigitLower
• IsAsciiHexDigitUpper
• IsAsciiLetter
• IsAsciiLetterLower
• IsAsciiLetterOrDigit
• IsAsciiLetterUpper
• IsBetween
• IsControl
• IsDigit
• IsHighSurrogate
• IsLetter
• IsLetterOrDigit
• IsLower
• IsLowSurrogate
• IsNumber
• IsPunctuation
• IsSeparator
• IsSurrogate
• IsSurrogatePair
• IsSymbol
• IsUpper
• IsWhiteSpace
• Parse
• ToLower
• ToLowerInvariant
• ToUpper
• ToUpperInvariant
• TryParse

Background

The List<T> methods that add items to lists do not allow chaining because they return void instead of the list.

Requirements

Implement extension methods that return the list for

• List<t>.Add()
• List<t>.AddRange()
• List<t>.Clear()
• List<t>.Insert()
• List<t>.InsertRange()
• List<t>.RemoveAt() is specifically excluded to avoid methods with side effects.
• List<t>.RemoveRange() is specifically excluded to avoid methods with side effects.
• List<t>.Reverse() is specifically excluded to avoid methods with side effects.
• List<t>.Sort() is specifically excluded to avoid methods with side effects.
• List<t>.TrimExcess() is specifically excluded to avoid methods with side effects.

Notes

• List<t>.CopyTo() is specifically excluded to avoid methods with side effects.
• List<t>.ForEach() is specifically excluded to avoid methods with side effects.

Background

There are no unit tests for StreamExtensions.

Requirements

• Add unit test(s) for StreamExtensions.Readlines().

Problem

The string.Format() unit tests use invalid composite format strings. In particular, several contain old-style percent (%) format specifications.

Requirements

• Correct the format strings
• Ensure unit tests still pass

Background

The ConversionExtension class contains a combination extension methods for existing static methods (e.g., Int32.ParseInt()) and casts (e.g., ToLong()). This organization does not entirely make sense.

Requirements

• Move the casts into new class CastExtensions.
• Move unit tests into new class CastExtensionsTests.
• Create additional unit tests if needed.

Background

Test coverage is not computed.

Requirements

• Add test code coverage computation and reports