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Add AbstractStringAssert#asInstanceOf(Class<? extends Number>, ...) #2509

@onacit

Description

@onacit

Summary

Please forgive me If this issue is already fulfilled or not appropriate.

I just faced a situation that I need to assert an actual of String against an expected of int.

String actual = calculate();
int expected = 1;
assertThat(actual).isNotNull().satisfies(v -> {
    assertThat(Integer.parseInt(v)).isEqualsTo(expected);
});
assertThat(actual).isNotNull()
        .asInstanceOf(new InstanceOfAssertFactory<>(String.class, v -> assertThat(Integer.parseInt(v))))
        .isEqualTo(expected);

Example

Do I have an already existing handy idiom or do I have any chance to get following one?

String actual = calculate();
int expected = 1;
assertThat(actual).parsesAsInt().isEqualsTo(expected);
 // <N extends Number, A extends NumberAssert<?, N>> A asInstanceOf(Class<N>, Class<A>)
assertThat(actual)
        .asInstanceOf(Integer.class, AbstractIntegerAssert.class)
        .isEqualTo(expected);
 // AbstractIntegerAssert<?> asInstanceOfIntegerAssert()
assertThat(actual)
        .asInstanceOfIntegerAssert()
        .isEqualTo(expected);

Thanks.

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