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..23411a8e1d
--- /dev/null
+++ b/spec/ruby/language/not_spec.rb
@@ -0,0 +1,51 @@
+require_relative '../spec_helper'
+
+describe "The not keyword" do
+  it "negates a `true' value" do
+    (not true).should == false
+    (not 'true').should == false
+  end
+
+  it "negates a `false' value" do
+    (not false).should == true
+    (not nil).should == true
+  end
+
+  it "accepts an argument" do
+    not(true).should == false
+  end
+
+  it "returns false if the argument is true" do
+    (not(true)).should == false
+  end
+
+  it "returns true if the argument is false" do
+    (not(false)).should == true
+  end
+
+  it "returns true if the argument is nil" do
+    (not(nil)).should == true
+  end
+end
+
+describe "The `!' keyword" do
+  it "negates a `true' value" do
+    (!true).should == false
+    (!'true').should == false
+  end
+
+  it "negates a `false' value" do
+    (!false).should == true
+    (!nil).should == true
+  end
+
+  it "doubled turns a truthful object into `true'" do
+    (!!true).should == true
+    (!!'true').should == true
+  end
+
+  it "doubled turns a not truthful object into `false'" do
+    (!!false).should == false
+    (!!nil).should == false
+  end
+end