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Fet - F# Easy Test

Sometimes you dont need a fully fledged testing suite. Sometimes you just want to do some assertions without having to import and use a big framework that might just get in your way.

This is where Fet shines. It gets out of your way and lets you write tests fast. It works with both dotnet and fable so you don't need to import huge libraries like Mocha or Jest if you don't need them.

Examples

Define your tests with the test function. You put one more more of these in a testList. To actually run the test add them in a list and send it as an argument to runTests.

let tests =
    let add a b = a + b

    testList "Some tests" [
        test "Add 2 and 2 equals 4" <| fun () ->
              let expected = 4
              Expect.equal (add 2 2) expected

        test "This test should fail" <| fun () ->
            Expect.equal (3+3) 5
     ]

let evenMoreTests =
       testList "List tests" [
        test "Length of empty list should be 0" <| fun () ->
            Expect.equal (List.length []) 0

        test "Length of 10 elements should not be empty" <| fun () ->
            Expect.equal (List.isEmpty [1..10]) false
        ]

runTests [ tests; evenMoreTests ]

Result: Fail Succeed

See more examples in the example folder.