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Diffstat (limited to 'spec/rubyspec/language/and_spec.rb')
-rw-r--r-- | spec/rubyspec/language/and_spec.rb | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/spec/rubyspec/language/and_spec.rb b/spec/rubyspec/language/and_spec.rb new file mode 100644 index 0000000000..e084fd3cef --- /dev/null +++ b/spec/rubyspec/language/and_spec.rb @@ -0,0 +1,80 @@ +require File.expand_path('../../spec_helper', __FILE__) + +describe "The '&&' statement" do + + it "short-circuits evaluation at the first condition to be false" do + x = nil + true && false && x = 1 + x.should be_nil + end + + it "evaluates to the first condition not to be true" do + value = nil + (value && nil).should == nil + (value && false).should == nil + value = false + (value && nil).should == false + (value && false).should == false + + ("yes" && 1 && nil && true).should == nil + ("yes" && 1 && false && true).should == false + end + + it "evaluates to the last condition if all are true" do + ("yes" && 1).should == 1 + (1 && "yes").should == "yes" + end + + it "evaluates the full set of chained conditions during assignment" do + x, y = nil + x = 1 && y = 2 + # "1 && y = 2" is evaluated and then assigned to x + x.should == 2 + end + + it "treats empty expressions as nil" do + (() && true).should be_nil + (true && ()).should be_nil + (() && ()).should be_nil + end + +end + +describe "The 'and' statement" do + it "short-circuits evaluation at the first condition to be false" do + x = nil + true and false and x = 1 + x.should be_nil + end + + it "evaluates to the first condition not to be true" do + value = nil + (value and nil).should == nil + (value and false).should == nil + value = false + (value and nil).should == false + (value and false).should == false + + ("yes" and 1 and nil and true).should == nil + ("yes" and 1 and false and true).should == false + end + + it "evaluates to the last condition if all are true" do + ("yes" and 1).should == 1 + (1 and "yes").should == "yes" + end + + it "when used in assignment, evaluates and assigns expressions individually" do + x, y = nil + x = 1 and y = 2 + # evaluates (x=1) and (y=2) + x.should == 1 + end + + it "treats empty expressions as nil" do + (() and true).should be_nil + (true and ()).should be_nil + (() and ()).should be_nil + end + +end |