Private Sub FloorVerify()
    ' Test the Floor function.

    ' Precision = .5

    Debug.Assert Floor(1.4, 0.5) = 1
    Debug.Assert Floor(1.1, 0.5) = 1
    Debug.Assert Floor(1, 0.5) = 1

    Debug.Assert Floor(0.9, 0.5) = 0.5
    Debug.Assert Floor(0.6, 0.5) = 0.5
    Debug.Assert Floor(0.5, 0.5) = 0.5

    Debug.Assert Floor(0.4, 0.5) = 0
    Debug.Assert Floor(0.1, 0.5) = 0
    Debug.Assert Floor(0, 0.5) = 0

    Debug.Assert Floor(-0.1, 0.5) = -0.5
    Debug.Assert Floor(-0.4, 0.5) = -0.5
    Debug.Assert Floor(-0.5, 0.5) = -0.5

    Debug.Assert Floor(-0.6, 0.5) = -1
    Debug.Assert Floor(-0.9, 0.5) = -1
    Debug.Assert Floor(-1, 0.5) = -1

    Debug.Assert Floor(-1.1, 0.5) = -1.5
    Debug.Assert Floor(-1.4, 0.5) = -1.5

    ' Precision = 1

    Debug.Assert Floor(2.9) = 2
    Debug.Assert Floor(2.1) = 2
    Debug.Assert Floor(2) = 2

    Debug.Assert Floor(1.9) = 1
    Debug.Assert Floor(1.1) = 1
    Debug.Assert Floor(1) = 1

    Debug.Assert Floor(0.9) = 0
    Debug.Assert Floor(0.1) = 0
    Debug.Assert Floor(0) = 0

    Debug.Assert Floor(-0.1) = -1
    Debug.Assert Floor(-0.9) = -1
    Debug.Assert Floor(-1) = -1

    Debug.Assert Floor(-1.1) = -2
    Debug.Assert Floor(-1.9) = -2
    Debug.Assert Floor(-2) = -2

    Debug.Assert Floor(-2.1) = -3
    Debug.Assert Floor(-2.9) = -3

    ' Precision = 2

    Debug.Assert Floor(5.9, 2) = 4
    Debug.Assert Floor(4.1, 2) = 4
    Debug.Assert Floor(4, 2) = 4

    Debug.Assert Floor(3.9, 2) = 2
    Debug.Assert Floor(2.1, 2) = 2
    Debug.Assert Floor(2, 2) = 2

    Debug.Assert Floor(1.9, 2) = 0
    Debug.Assert Floor(0.1, 2) = 0
    Debug.Assert Floor(0, 2) = 0

    Debug.Assert Floor(-0.1, 2) = -2
    Debug.Assert Floor(-1.9, 2) = -2
    Debug.Assert Floor(-2, 2) = -2

    Debug.Assert Floor(-2.1, 2) = -4
    Debug.Assert Floor(-3.9, 2) = -4
    Debug.Assert Floor(-4, 2) = -4

    Debug.Assert Floor(-4.1, 2) = -6
    Debug.Assert Floor(-5.9, 2) = -6

    ' Other

    Debug.Assert IsNull(Floor(Null))
    Debug.Assert IsNull(Floor("Joe"))

    Debug.Assert Floor(2.9, Null) = 2
    Debug.Assert Floor(2.9, "Joe") = 2

End Sub