Kotlin Junit5 ValueSource as an array variable

Question

I have a map of key and values and I want to add the keys as array to ValueSource but I've got error.Where am I wrong?

Here's my code

   private val id = mapOf("abc" to 10001,"def" to 955,"ghi" to 804,"jkl" to 805)
    private val ids:Array<String> = id.keys.toTypedArray()
    
    @ParameterizedTest
    @ValueSource(strings = ids)
    fun idConverterImpl(memberId: String) {
}

score 2 · Accepted Answer · answered Nov 22 '21 at 08:39

The arguments to annotations must be compile time constants. ids is not a compile time constant. It is the value of id.keys.toTypedArray(), which must be computed at runtime.

You can instead write it inline like this:

@ParameterizedTest
@ValueSource(strings = ["abc", "def", "ghi", "jkl"])
fun idConverterImpl(memberId: String) { ... }

If you don't want to duplicate the keys of your map in multiple places, you can instead use a MethodSource. This allows you to non compile-time constants as the parameters of your test, by providing a method that will generate the parameters.

You will need to make your map and values static:

companion object {
    @JvmStatic
    private val id = mapOf("abc" to 100016040, "def" to 955803, "ghi" to 955804, "jkl" to 955805)

    @JvmStatic
    private val ids by lazy { id.keys }
}

By using a property delegate on ids, I made Kotlin generate a getIds method, that I can then refer to using MethodSource:

@ParameterizedTest
@MethodSource("getIds")
fun idConverterImpl(memberId: String) { ... }

score 0 · Answer 2 · answered Nov 22 '21 at 08:22

0

Yours keys mapping and fetching is ok, you are probably having some other kind of issue my guess is private your tests cant get to data

answered Nov 22 '21 at 08:22

Vojin Purić

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Kotlin Junit5 ValueSource as an array variable

2 Answers2