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