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until_spec.rb
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until_spec.rb
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require File.dirname(__FILE__) + '/../spec_helper'
# TODO: break, redo, next, retry
# until bool-expr [do]
# body
# end
#
# begin
# body
# end while bool-expr
#
# expr until bool-expr
describe "The until expression" do
it "should run while the expression is false" do
i = 0
until i > 9
i += 1
end
i.should == 10
end
it "should optionally take a 'do' after the expression" do
i = 0
until i > 9 do
i += 1
end
i.should == 10
end
it "should allow body begin on the same line if do is used" do
i = 0
until i > 9 do i += 1
end
i.should == 10
end
it "should execute code in containing variable scope" do
i = 0
until i == 1
a = 123
i = 1
end
a.should == 123
end
it "should execute code in containing variable scope with 'do'" do
i = 0
until i == 1 do
a = 123
i = 1
end
a.should == 123
end
it "should return nil if ended when condition became true" do
i = 0
while i > 9
i += 1
end.should == nil
end
it "should stop running body if interrupted by break" do
i = 0
until i > 9
i += 1
break if i > 5
end
i.should == 6
end
it "should return value passed to break if interrupted by break" do
until false
break 123
end.should == 123
end
it "should return nil if interrupted by break with no arguments" do
until false
break
end.should == nil
end
it "should skip to end of body with next" do
a = []
i = 0
until (i+=1)>=5
next if i==3
a << i
end
a.should == [1, 2, 4]
end
it "should restart current iteration without reevaluating condition with redo" do
a = []
i = 0
j = 0
until (i+=1)>=3
a << i
j+=1
redo if j<3
end
a.should == [1, 1, 1, 2]
end
end
describe "The until modifier" do
it "should run preceding statement while the condition is false" do
i = 0
i += 1 until i > 9
i.should == 10
end
it "should evaluate condition before statement execution" do
a = []
i = 0
a << i until (i+=1) >= 3
a.should == [1, 2]
end
it "should not run preceding statement if the condition is true" do
i = 0
i += 1 until true
i.should == 0
end
it "should return nil if ended when condition became true" do
i = 0
(i += 1 until i>9).should == nil
end
it "should return value passed to break if interrupted by break" do
(break 123 until false).should == 123
end
it "should return nil if interrupted by break with no arguments" do
(break until false).should == nil
end
it "should skip to end of body with next" do
a = []
i = 0
lambda { next if i==3; a << i }.call until (i+=1)>=5
a.should == [1, 2, 4]
end
it "should restart current iteration without reevaluating condition with redo" do
a = []
i = 0
j = 0
lambda { a << i; j+=1; redo if j<3 }.call until (i+=1)>=3
a.should == [1, 1, 1, 2]
end
end
describe "The until modifier with begin .. end block" do
it "should run block while the expression is false" do
i = 0
begin
i += 1
end until i > 9
i.should == 10
end
it "should stop running block if interrupted by break" do
i = 0
begin
i += 1
break if i > 5
end until i > 9
i.should == 6
end
it "should return value passed to break if interrupted by break" do
(begin; break 123; end until false).should == 123
end
it "should return nil if interrupted by break with no arguments" do
(begin; break; end until false).should == nil
end
it "should run block at least once (even if the expression is true)" do
i = 0
begin
i += 1
end until true
i.should == 1
end
it "should evaluate condition after block execution" do
a = []
i = 0
begin
a << i
end until (i+=1)>=5
a.should == [0, 1, 2, 3, 4]
end
it "should skip to end of body with next" do
a = []
i = 0
begin
next if i==3
a << i
end until (i+=1)>=5
a.should == [0, 1, 2, 4]
end
it "should restart current iteration without reevaluting condition with redo" do
a = []
i = 0
j = 0
begin
a << i
j+=1
redo if j<3
end until (i+=1)>=3
a.should == [0, 0, 0, 1, 2]
end
end