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import org.hamcrest.CoreMatchers;
import org.jetbrains.annotations.Nullable;
import static org.hamcrest.CoreMatchers.*;
import static org.junit.Assert.assertThat;
class Contracts {
private void checkNotNullValue(@Nullable Object o) {
assertThat(o, CoreMatchers.<Object>notNullValue());
System.out.println(o.hashCode());
}
private void checkNotEqualToNull(@Nullable String test) {
assertThat("String is null", test, not(equalTo(null)));
int length = test.length();
}
}
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