public boolean containsCharacter(String string, char character) {
        return string.indexOf(character) != -1;
    }
Tests {@link AzureAdOpMetadataResolver}.

@author Arjan van de Kamp
@since 6.0.4
pac4j-oidc/src/test/java/org/pac4j/oidc/metadata/AzureAdOpMetadataResolverTest.java