### Question:
Node { public String getKey() { return key; } Node(Vertex vertex, String entityTypeName); String getLabel(); String getType(); String getKey(); @Override boolean equals(Object other); @Override int hashCode(); @Override String toString();  }### Answer:
@Test public void getKeyReturnsTheKey() throws IOException { Node underTest = new Node(mockDocumentVertex, null); assertThat(underTest.getKey(), is(TYPE + "s/" + TIM_ID)); }