1
exercism fetch csharp diamond

Diamond

The diamond kata takes as its input a letter, and outputs it in a diamond shape. Given a letter, it prints a diamond starting with 'A', with the supplied letter at the widest point.

Requirements

Examples

In the following examples, spaces are indicated by · characters.

Diamond for letter 'A':

1
A

Diamond for letter 'C':

1
2
3
4
5
··A··
·B·B·
C···C
·B·B·
··A··

Diamond for letter 'E':

1
2
3
4
5
6
7
8
9
····A····
···B·B···
··C···C··
·D·····D·
E·······E
·D·····D·
··C···C··
···B·B···
····A····

Hints

The tests in this exercise are different from your usual tests. Normally, a test checks if for a given input, the output matches the expected value. This is called value-based testing. However, this exercise uses property-based testing, where the tests check if for a range of inputs, the output has a specific property. The two key differences that differentiate property-based testing from value-based testing are:

  1. A property-based test works not with a single input value, but with many.
  2. A property-based test verifies properties, not concrete values.

For this exercise, the tests all verify a property of the diamond shape your code should be producing. Furthermore, all tests check if the property they test holds for all valid input letters ('A' to 'Z').

For more information on property-based testing, see this article.

Submitting Exercises

Note that, when trying to submit an exercise, make sure the exercise file that you're submitting is in the exercism/csharp/<exerciseName> directory.

For example, if you're submitting bob.cs for the Bob exercise, the submit command would be something like exercism submit <path_to_exercism_dir>/csharp/bob/bob.cs.

Source

Seb Rose http://claysnow.co.uk/recycling-tests-in-tdd/

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.