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require File.expand_path('../../../spec_helper', __FILE__)
ruby_version_is "1.8.7" do
require File.expand_path('../fixtures/classes', __FILE__)
describe "Object#instance_exec" do
it "raises a LocalJumpError unless given a block" do
lambda { "hola".instance_exec }.should raise_error(LocalJumpError)
end
it "has an arity of -1" do
Object.new.method(:instance_exec).arity.should == -1
end
it "accepts arguments with a block" do
lambda { "hola".instance_exec(4, 5) { |a,b| a + b } }.should_not raise_error
end
it "doesn't pass self to the block as an argument" do
"hola".instance_exec { |o| o }.should be_nil
end
it "passes any arguments to the block" do
Object.new.instance_exec(1,2) {|one, two| one + two}.should == 3
end
it "only binds the exec to the receiver" do
f = Object.new
f.instance_exec do
def foo
1
end
end
f.foo.should == 1
lambda { Object.new.foo }.should raise_error(NoMethodError)
end
# TODO: This should probably be replaced with a "should behave like" that uses
# the many scoping/binding specs from kernel/eval_spec, since most of those
# behaviors are the same for instance_exec. See also module_eval/class_eval.
it "binds self to the receiver" do
s = "hola"
(s == s.instance_exec { self }).should == true
end
it "binds the block's binding self to the receiver" do
s = "hola"
(s == s.instance_exec { eval "self", binding }).should == true
end
it "executes in the context of the receiver" do
"Ruby-fu".instance_exec { size }.should == 7
Object.class_eval { "Ruby-fu".instance_exec{ to_s } }.should == "Ruby-fu"
end
it "has access to receiver's instance variables" do
ObjectSpecs::IVars.new.instance_exec { @secret }.should == 99
end
it "invokes Method objects without rebinding self" do
3.instance_exec(4, &5.method(:+)).should == 9
end
ruby_version_is ""..."1.9" do
it "sets class variables in the receiver" do
ObjectSpecs::InstExec.class_variables.should include("@@count")
ObjectSpecs::InstExec.send(:class_variable_get, :@@count).should == 2
end
end
ruby_version_is "1.9" do
it "sets class variables in the receiver" do
ObjectSpecs::InstExec.class_variables.should include(:@@count)
ObjectSpecs::InstExec.send(:class_variable_get, :@@count).should == 2
end
end
it "raises a TypeError when defining methods on an immediate" do
lambda do
1.instance_exec { def foo; end }
end.should raise_error(TypeError)
lambda do
:foo.instance_exec { def foo; end }
end.should raise_error(TypeError)
end
quarantine! do # Not clean, leaves cvars lying around to break other specs
it "scopes class var accesses in the caller when called on a Fixnum" do
# Fixnum can take instance vars
Fixnum.class_eval "@@__tmp_instance_exec_spec = 1"
(defined? @@__tmp_instance_exec_spec).should == nil
@@__tmp_instance_exec_spec = 2
1.instance_exec { @@__tmp_instance_exec_spec }.should == 2
Fixnum.__send__(:remove_class_variable, :@@__tmp_instance_exec_spec)
end
end
it "raises a TypeError when defining methods on numerics" do
lambda do
(1.0).instance_exec { def foo; end }
end.should raise_error(TypeError)
lambda do
(1 << 64).instance_exec { def foo; end }
end.should raise_error(TypeError)
end
end
end
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