text: var Must = require("../..")
  var assert = require("./assert")
  
  describe("Must.prototype.null", function() {
    it("must pass given null", function() {
      assert.pass(function() { Must(null).be.null() })
    })
  
    it("must fail given true primitive", function() {
      assert.fail(function() { Must(true).be.null() })
    })
  
    it("must fail given false primitive", function() {
      assert.fail(function() { Must(false).be.null() })
    })
  
    it("must fail given undefined", function() {
      assert.fail(function() { Must(undefined).be.null() })
    })
  
    it("must fail given empty string", function() {
      assert.fail(function() { Must("").be.null() })
    })
  
    it("must not do anything when not called as a function", function() {
      assert.pass(function() { void Must(null).be.null })
    })
  
    require("./_assertion_error_test")(function() { Must(true).be.null() }, {
      actual: true,
      expected: null,
      message: "true must be null"
    })
  
    describe(".not", function() {
      it("must invert the assertion", function() {
        assert.fail(function() { Must(null).not.be.null() })
      })
    })
  })
  