FancySpec describe: NilClass with: {
  it: "is false for calling and: with any value" with: 'and: when: {
    nil and: true . is: nil
    nil and: 'foo . is: nil
    nil and: nil . is: nil
    false and: true . is: false
    false and: 'foo . is: false
    false and: nil . is: false
  }

  it: "is nil/false for calling && with any value" with: '&& when: {
    (nil && true) is: nil
    (nil && 'foo) is: nil
    (nil && nil) is: nil
    (false && true) is: false
    (false && 'foo) is: false
    (false && nil) is: false
  }

  it: "is true for calling or: with any non-nil value" with: 'or: when: {
    nil or: true . is: true
    nil or: 'foo . is: 'foo
  }

  it: "is nil/false for calling or: with a nil/false value" with: 'or: when: {
    nil or: nil . is: nil
    nil or: false . is: false
  }

  it: "is true for calling || with any non-nil value" with: '|| when: {
    (nil || true) is: true
    (nil || 'foo) is: 'foo
  }

  it: "is nil for calling || with a nil value" with: '|| when: {
    (nil || nil) is: nil
  }

  it: "does not call the block" with: 'if_true: when: {
    nil if_true: { 'then } . is: nil
  }

  it: "does not call the block" with: 'if_false: when: {
    nil if_false: { 'false } . is: nil
  }

  it: "is nil" with: 'nil? when: {
    nil nil? is: true
  }

  it: "is false" with: 'false? when: {
    nil false? is: false
  }

  it: "is not true" with: 'true? when: {
    nil true? is: false
  }

  it: "calls the block if nil" with: 'if_nil: when: {
    nil if_nil: { 'is_nil } . is: 'is_nil
  }
}