Theories in C#

One test body, many cases.

using Xunit;

public class FizzTests
{
    static string Fizz(int n) => (n % 3, n % 5) switch
    {
        (0, 0) => "FizzBuzz", (0, _) => "Fizz",
        (_, 0) => "Buzz", _ => n.ToString(),
    };

    [Theory]
    [InlineData(3, "Fizz")]
    [InlineData(10, "Buzz")]
    [InlineData(15, "FizzBuzz")]
    [InlineData(7, "7")]
    public void Maps_the_classics(int n, string expected)
    {
        Assert.Equal(expected, Fizz(n));
    }
}

How it works

1. [Theory] plus [InlineData] runs the body per row.
2. The tuple-pattern switch is the code under test, in the same file.
3. Four rows cover Fizz, Buzz, both and neither.

Keywords and builtins used here

• Fizz
• FizzTests
• Maps_the_classics
• class
• int
• public
• static
• string
• switch
• using
• void

The run, in numbers

Lines

20

Characters to type

373

Tokens

90

Three-star pace

85 tpm

At the three-star pace of 85 tokens a minute, this run takes about 64 seconds.

Type this snippet

Step 2 of 3 in Testing, step 11 of 16 in The open ecosystem.

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