@Test
public void testSetTag_stringType() {

    Span result = undertest.setTag("a-key", "v");
    assertSame(result, undertest);
    verifyZeroInteractions(abstractTracer);
    assertNotNull(grpcSpan.getTagsList());
    assertEquals(1, grpcSpan.getTagsCount());
    assertEquals(KeyValue.newBuilder().setKey("a-key").setStringValue("v").build(), grpcSpan.getTags(0));
    result = undertest.setTag(new StringTag("b-key"), "v");
    assertSame(result, undertest);
    verifyZeroInteractions(abstractTracer);
    assertNotNull(grpcSpan.getTagsList());
    assertEquals(2, grpcSpan.getTagsCount());
    assertEquals(KeyValue.newBuilder().setKey("b-key").setStringValue("v").build(), grpcSpan.getTags(1));
}