Replace [TestCase] tests with individual tests

[ErikSchierboom]

We have several places where we use [TestCase] to create a single test with multiple input values. While efficient (no code duplication), this is not the best of user experiences as it makes it harder to run a single test and also doesn't really allow us to mark the various input values with a descriptive text. It also doesn't align with how canonical data for exercises is defined, which only works on single test cases.

Consider the isogram exercises's tests:

[TestCase("duplicates", ExpectedResult = true)]
[TestCase("eleven", ExpectedResult = false, Ignore = "Remove to run test case")]
[TestCase("subdermatoglyphic", ExpectedResult = true, Ignore = "Remove to run test case")]
[TestCase("Alphabet", ExpectedResult = false, Ignore = "Remove to run test case")]
[TestCase("thumbscrew-japingly", ExpectedResult = true, Ignore = "Remove to run test case")]
[TestCase("Hjelmqvist-Gryb-Zock-Pfund-Wax", ExpectedResult = true, Ignore = "Remove to run test case")]
[TestCase("Heizölrückstoßabdämpfung", ExpectedResult = true, Ignore = "Remove to run test case")]
[TestCase("the quick brown fox", ExpectedResult = false, Ignore = "Remove to run test case")]
[TestCase("Emily Jung Schwartzkopf", ExpectedResult = true, Ignore = "Remove to run test case")]
[TestCase("éléphant", ExpectedResult = false, Ignore = "Remove to run test case")]
public bool Isogram_correctly_detects_isograms(string input)
{
    return Isogram.IsIsogram(input);
}

What's the difference between test case one and two? It's not immediately obvious. The canonical-data of this exercise looks much nicer. I think we should convert the [TestCase] tests to individual tests.

[robkeim]

In terms of the argument that we're missing the richness of the canonical data I think we could work around that by adding additional comments alongside of the test cases.

However, from a usability standpoint, I'm all for making the tests easier to run if they're difficult to run today. In my setup I'm using Visual Studio which has the ability to run all of the cases for a single test or to run them one by one very easily, but I know different tools don't support the same functionality.

Here are the list of exercises using the TestCase attribute:

• acronym
• atbash-cipher
• beer-song
• clock
• diamond
• grep
• isogram
• luhn
• matrix
• meetup
• nth-prime
• perfect-numbers
• pig-latin
• protein-translation
• pythagorean-triplet
• raindrops
• roman-numerals
• series
• simple-linked-list

[ErikSchierboom]

Great work gathering this data @robkeim!

[balazsbotond]

I can start working on these. I will always leave a comment here before starting to convert the tests for an exercise - this way you'll know which ones are still up for grabs :)

[robkeim]

Sounds great, thanks @balazsbotond.

[ErikSchierboom]

@balazsbotond Would you mind waiting until I've merged #193? Otherwise we'll have lots of merge conflicts :)

[balazsbotond]

@ErikSchierboom OK, then I'll start with the F# track :)

[ErikSchierboom]

Great!

[ErikSchierboom]

@balazsbotond I've just merged #199, which means that this issue is now free to being worked on (if you're still interested).