67 lines
2.4 KiB
Java
67 lines
2.4 KiB
Java
import java.util.Optional;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.assertj.core.api.Assertions.fail;
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public class Java8Optional {
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private void java8Optional() {
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Optional<String> opt = Optional.empty();
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assertThat(opt).as("foo").isPresent();
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assertThat(opt).isPresent();
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assertThat(opt).isPresent();
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assertThat(opt).isPresent();
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assertThat(opt).isPresent();
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assertThat(opt).isNotPresent();
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assertThat(opt).isNotPresent();
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assertThat(opt).isNotPresent();
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assertThat(opt).isNotPresent();
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assertThat(opt).isNotPresent();
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assertThat(opt).as("foo").contains("foo");
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assertThat(opt).containsSame("foo");
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assertThat(opt.get()).isNotEqualTo("foo");
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assertThat(opt.get()).isNotSameAs("foo");
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assertThat(opt).as("foo").isNotPresent();
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assertThat(opt).isNotPresent();
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assertThat(opt).isPresent();
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assertThat(opt).isPresent();
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//assertThat(opt.get()).isEqualTo(opt.get()); // there's a better version than contains(opt.get())
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assertThat(opt.orElse(null)).isEqualTo(opt.get());
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//assertThat(opt.get()).isEqualTo(opt.orElse(null)); // there's a better version than contains(opt.orElse(null))
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assertThat(opt).contains(opt.get());
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assertThat(opt).contains(opt.orElse(null));
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String possibleNullString = System.getProperty("username");
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String notNullString = "Narf";
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assertThat(opt).as("foo").contains("foo");
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assertThat(opt).contains("foo");
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assertThat(opt).isEqualTo(Optional.ofNullable(null));
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assertThat(opt).isEqualTo(Optional.ofNullable(possibleNullString));
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assertThat(opt).isEqualTo(Optional.ofNullable(notNullString));
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assertThat(opt).isNotEqualTo(Optional.of("foo"));
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assertThat(opt).isNotEqualTo(Optional.ofNullable("foo"));
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assertThat(opt).as("foo").isNotPresent();
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assertThat(opt).isPresent();
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assertThat(opt).as("foo").isPresent().as("bar").isPresent();
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assertThat(opt.isPresent()).as("foo").isEqualTo(false).as("bar").isTrue();
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assertThat(opt.get()).isEqualTo("foo").isSameAs("foo").isNotEqualTo("foo").isNotSameAs("foo");
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assertThat(opt.orElse("foo")).as("foo").isEqualTo(null);
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assertThat(opt.orElse(null)).as("foo").isEqualTo(null).isNotNull();
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org.junit.Assert.assertThat(opt, null);
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fail("oh no!");
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}
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}
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