how to verify in assertj that elements are one of

Question

I can't find how to do check with assertj the following (which is very common):

Suppose I have:

 result1 = {"AAA", "BBB"}
 result2 = {"DDD"}

I want to check the values in result is one of these:

String[] valid = String[]{"AAA", "BBB", "CCC"};

using assertj, whould be something as:

assertThat(result1).xxxx(valid);
assertThat(result2).xxxx(valid);

So that result1 would pass check, but result2 not.

contains() does not work (it checks that result contains all valid elements)

I don't want have to create a custom condition for this kind of checking

Any idea?

Answer 1

You can wtite it the other way around:

assertThat(valid).contains(result1);
assertThat(valid).contains(result2);

If you insist on having the result on the left and valid on the right side, you can use:

assertThat(result1).isSubsetOf(Arrays.asList(valid));
assertThat(result2).isSubsetOf(Arrays.asList(valid));

Or, why not to define the valid as a set, rather than an array?

Set<String> valid = Sets.newHashSet("AAA", "BBB", "CCC"); //Sets comes from google guava
assertThat(result1).isSubsetOf(valid);
assertThat(result2).isSubsetOf(valid);