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 * modification, must retain the above copyright notice and the following
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package io.spine.server.trace.stackdriver;

import com.google.common.testing.NullPointerTester;
import io.spine.core.BoundedContextName;
import io.spine.core.MessageId;
import io.spine.system.server.EntityTypeName;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

import static com.google.common.testing.NullPointerTester.Visibility.PROTECTED;

@DisplayName("SignalSpan should")
class SignalSpanTest {

    @Test
    @DisplayName("not accept nulls on construction")
    void nulls() {
        NullPointerTester tester = new NullPointerTester();
        tester.setDefault(BoundedContextName.class, BoundedContextName.getDefaultInstance())
              .setDefault(MessageId.class, MessageId.getDefaultInstance())
              .setDefault(EntityTypeName.class, EntityTypeName.getDefaultInstance());
        tester.testAllPublicInstanceMethods(SignalSpan.newBuilder());
        tester.testConstructors(SignalSpan.class, PROTECTED);
    }
}

Add a null tolerance test
Add a null tolerance test
