Expressive testing with NUnit in F#

TestModule.fs

module TestModule
open NUnit.Framework

let inline (==) (actual:#obj) (expected:#obj) = Assert.AreEqual(expected, actual)
let inline (!=) (actual:#obj) (expected:#obj) = Assert.AreNotEqual(expected, actual)
let inline (<->) (actual:#obj) expected = Assert.IsInstanceOf(expected, actual)
let inline (<!>) (actual:#obj) expected = Assert.IsNotInstanceOf(expected, actual)
let ``is null`` anObject = Assert.IsNull(anObject)
let ``is not null`` anObject = Assert.NotNull(anObject)

[<Test>]
let ``1 + 1 = 2``() = 1 + 1 == 2

[<Test>]
let ``1 + 1 + 1 <> 2``() = 1 + 1 + 1 != 2

[<Test>]
let ``"Howdy"B is a byte[]``() = "Howdy"B <-> typeof<byte[]>

[<Test>]
let ``"Howdy" is not a byte[]``() = "Howdy" <!> typeof<byte[]>

[<Test>]
let ``null is null``() = null |> ``is null``

[<Test>]
let ``new obj() is not null``() = let o = obj() in o |> ``is not null``

According to NUnit's docs, the TestAttribute should not be required. However, TestDriven.net does not pick up tests starting with the text "test." Also, TestDriven.net will not run the above tests from solution explorer, only from the file. Replacing the back-tick names with something more standard will work.