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require_relative '../spec_helper'
describe "The || operator" do
it "evaluates to true if any of its operands are true" do
if false || true || nil
x = true
end
x.should == true
end
it "evaluated to false if all of its operands are false" do
if false || nil
x = true
end
x.should == nil
end
it "is evaluated before assignment operators" do
x = nil || true
x.should == true
end
it "has a lower precedence than the && operator" do
x = 1 || false && x = 2
x.should == 1
end
it "treats empty expressions as nil" do
(() || true).should be_true
(() || false).should be_false
(true || ()).should be_true
(false || ()).should be_nil
(() || ()).should be_nil
end
it "has a higher precedence than 'break' in 'break true || false'" do
# see also 'break true or false' below
-> { break false || true }.call.should be_true
end
it "has a higher precedence than 'next' in 'next true || false'" do
-> { next false || true }.call.should be_true
end
it "has a higher precedence than 'return' in 'return true || false'" do
-> { return false || true }.call.should be_true
end
end
describe "The or operator" do
it "evaluates to true if any of its operands are true" do
x = nil
if false or true
x = true
end
x.should == true
end
it "is evaluated after variables are assigned" do
x = nil or true
x.should == nil
end
it "has a lower precedence than the || operator" do
x,y = nil
x = true || false or y = 1
y.should == nil
end
it "treats empty expressions as nil" do
(() or true).should be_true
(() or false).should be_false
(true or ()).should be_true
(false or ()).should be_nil
(() or ()).should be_nil
end
it "has a lower precedence than 'break' in 'break true or false'" do
# see also 'break true || false' above
-> { eval "break true or false" }.should raise_error(SyntaxError, /void value expression/)
end
it "has a lower precedence than 'next' in 'next true or false'" do
-> { eval "next true or false" }.should raise_error(SyntaxError, /void value expression/)
end
it "has a lower precedence than 'return' in 'return true or false'" do
-> { eval "return true or false" }.should raise_error(SyntaxError, /void value expression/)
end
end
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