1 files changed, 51 insertions, 0 deletions
diff --git a/spec/ruby/language/not_spec.rb b/spec/ruby/language/not_spec.rb
new file mode 100644
index 0000000000..a0cf6b15a6
--- /dev/null
+++ b/spec/ruby/language/not_spec.rb
@@ -0,0 +1,51 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+describe "The not keyword" do
+  it "negates a `true' value" do
+    (not true).should be_false
+    (not 'true').should be_false
+  end
+
+  it "negates a `false' value" do
+    (not false).should be_true
+    (not nil).should be_true
+  end
+
+  it "accepts an argument" do
+    not(true).should be_false
+  end
+
+  it "returns false if the argument is true" do
+    (not(true)).should be_false
+  end
+
+  it "returns true if the argument is false" do
+    (not(false)).should be_true
+  end
+
+  it "returns true if the argument is nil" do
+    (not(nil)).should be_true
+  end
+end
+
+describe "The `!' keyword" do
+  it "negates a `true' value" do
+    (!true).should be_false
+    (!'true').should be_false
+  end
+
+  it "negates a `false' value" do
+    (!false).should be_true
+    (!nil).should be_true
+  end
+
+  it "doubled turns a truthful object into `true'" do
+    (!!true).should be_true
+    (!!'true').should be_true
+  end
+
+  it "doubled turns a not truthful object into `false'" do
+    (!!false).should be_false
+    (!!nil).should be_false
+  end
+end