Fail tests with duplicate names

[mgold]

Implements #115: automatically fail tests with duplicated names across parents/children and siblings. Test that this works. Rename a pair of tests in our suite that broke this rule.

👀 @rtfeldman @jfmengels

[jfmengels]

Awesome! Thanks @mgold :)

[rtfeldman]

Woo, awesome! 😻

[rtfeldman]

How about sibling tests?

, expectToFail <|
    Test.concat
        [ describe "a describe with the same name as a sibling describe fails"
            [ test "a test" passingTest ]
        , describe "a describe with the same name as a sibling describe fails"
            [ test "another test" passingTest ]
        ]
, expectToFail <|
    Test.concat
        [ Test.concat
            [ describe "a describe with the same name as a de facto sibling describe fails"
                [ test "a test" passingTest ]
            ]
        , describe "a describe with the same name as a de facto sibling describe fails"
            [ test "another test" passingTest ]
        ]
, expectToFail <|
    Test.concat
        [ Test.concat
            [ describe "a describe with the same name as a de facto sibling describe fails"
                [ test "a test" passingTest ]
            ]
        , Test.concat
            [ describe "a describe with the same name as a de facto sibling describe fails"
                [ test "another test" passingTest ]
            ]
        ]

[rtfeldman]

I think Test.concat needs to run duplicatedName too.

https://github.com/elm-community/elm-test/pull/133/files#r103121485 would fail if it's only on describe!

[mgold]

@rtfeldman New commit adds your proposed tests and implementation to make them pass.

[mgold]

@rtfeldman What about now?

[rtfeldman]

Love it! 😻