Micronaut-test: @Value can't be resolved when using ${} syntax

[Nahuel92]

Hi there!

I noticed that, when injecting @Value to a test method and using the ${} syntax, Micronaut can't resolve the placeholder property:

@Property(name = "myProp", value = "any")
@MicronautTest
class MicronautTestValueTest {
    @Test
    @DisplayName("This property can't be resolved")
    void failureOnInjectingPlaceholderValue(@Value("${myProp}") final String myValue) {
        assertThat(myValue).isEqualTo("any");
    }

    @Test
    @DisplayName("This property can be resolved ok")
    void successOnInjectingPropertyValue(@Value("myProp") final String myValue) {
        assertThat(myValue).isEqualTo("any");
    }

    @Test
    @DisplayName("This property can be resolved ok")
    void successOnInjectingProperty(@Property(name = "myProp") final String myValue) {
        assertThat(myValue).isEqualTo("any");
    }
}

I'm not sure if this is bug or intended, so I opted for creating this discussion thread before reporting a bug.

Here's my PoC app:
https://github.com/Nahuel92/poc-projects/tree/master/micronaut/micronaut-test-value

Thanks!