Good test/ bad test?

test.cs

[TestMethod]
public void GetContextId_OnSecondRun_ReturnsStoredContextId() // "should" is a grey phrase
{
    const string firstId = "200"; // context is used a lot in the test - removed here
    const string secondId = "400"; // and i isolate these from my arrange for readability

    // arrange
    var record = new ContextRecord();
    fakeRecordGenerator.Generate().Returns(record); // overuse of "Record" in here? necessary?
    fakeContextService.CreateContext(record).Returns(firstId);
    contextManager.GetContextId(); // why do we need to set the mock behaviour twice?
    fakeContextService.CreateContext(record).Returns(secondId);

    // act
    var resultContextId =  contextManager.GetContextId();

    Assert.AreEqual(firstContextId, resultContextId);
}