@Test
    public void testMissingTokenAuthenticator() {
        val bearerAuthClient = new DirectBearerAuthClient((Authenticator) null);
        TestsHelper.expectException(() -> bearerAuthClient.getCredentials(new CallContext(MockWebContext.create(),
                new MockSessionStore())), TechnicalException.class, "authenticator cannot be null");
    }
This class tests the {@link DirectBearerAuthClient} class.

@author Graham Leggett
@since 3.5.0
pac4j-http/src/test/java/org/pac4j/http/client/direct/DirectBearerAuthClientTests.java