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package coffee.liz.lambda.eval;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.mockito.Mockito;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Supplier;
public class ThunkTest {
@Test
public void testThunkNonNull() {
final AtomicInteger invok = new AtomicInteger(0);
final Supplier<Integer> i = () -> {
invok.incrementAndGet();
return invok.get();
};
final Thunk<Integer> thunk = new Thunk<>(i);
Assertions.assertEquals(1, thunk.get());
Assertions.assertEquals(1, thunk.get());
Assertions.assertEquals(1, thunk.get());
Assertions.assertEquals(1, invok.get());
}
@Test
public void testThunkNull() {
final AtomicInteger invok = new AtomicInteger(0);
final Supplier<Integer> i = () -> {
invok.incrementAndGet();
return null;
};
final Thunk<Integer> thunk = new Thunk<>(i);
Assertions.assertNull(thunk.get());
Assertions.assertNull(thunk.get());
Assertions.assertNull(thunk.get());
Assertions.assertEquals(1, invok.get());
}
}
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