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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Kernel#instance_eval" do
before :each do
ScratchPad.clear
end
it "expects a block with no arguments" do
lambda { "hola".instance_eval }.should raise_error(ArgumentError)
end
it "takes no arguments with a block" do
lambda { "hola".instance_eval(4, 5) {|a,b| a + b } }.should raise_error(ArgumentError)
end
it "yields the object to the block" do
"hola".instance_eval {|o| ScratchPad.record o }
ScratchPad.recorded.should == "hola"
end
ruby_version_is "".."1.9.0" do
it "returns the result of the block" do
"hola".instance_eval { :result }.should == :result
end
end
ruby_version_is "1.9.1".."1.9.2" do
it "returns nil" do
"hola".instance_eval { :result }.should == nil
end
end
ruby_version_is "1.9.2" do
it "returns the result of the block" do
"hola".instance_eval { :result }.should == :result
end
end
it "only binds the eval to the receiver" do
f = Object.new
f.instance_eval 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_eval. See also module_eval/class_eval.
# Feature removed in 1.9
ruby_version_is ""..."1.9" do
it "shares a scope across sibling evals" do
a, b = Object.new, Object.new
result = nil
a.instance_eval "x = 1"
lambda do
b.instance_eval "result = x"
end.should_not raise_error
result.should == 1
end
end
it "binds self to the receiver" do
s = "hola"
(s == s.instance_eval { self }).should be_true
o = mock('o')
(o == o.instance_eval("self")).should be_true
end
it "executes in the context of the receiver" do
"Ruby-fu".instance_eval { size }.should == 7
"hola".instance_eval("size").should == 4
Object.class_eval { "hola".instance_eval("to_s") }.should == "hola"
Object.class_eval { "Ruby-fu".instance_eval{ to_s } }.should == "Ruby-fu"
end
it "has access to receiver's instance variables" do
KernelSpecs::IVars.new.instance_eval { @secret }.should == 99
KernelSpecs::IVars.new.instance_eval("@secret").should == 99
end
it "treats block-local variables as local to the block" do
prc = instance_eval <<-CODE
proc do |x, prc|
if x
n = 2
else
n = 1
prc.call(true, prc)
n
end
end
CODE
prc.call(false, prc).should == 1
end
ruby_version_is ""..."1.9" do
it "sets class variables in the receiver" do
KernelSpecs::IncludesInstEval.class_variables.should include("@@count")
KernelSpecs::IncludesInstEval.send(:class_variable_get, :@@count).should == 2
end
end
ruby_version_is "1.9" do
# On 1.9 class variables aren't inherited so we have to modify the test
# from 1.8
it "sets class variables in the receiver" do
KernelSpecs::InstEvalCVar.class_variables.should include(:@@count)
KernelSpecs::InstEvalCVar.send(:class_variable_get, :@@count).should == 2
end
end
it "makes the receiver metaclass the scoped class when used with a string" do
obj = Object.new
klass = obj.instance_eval %{
class B; end
B
}
obj.singleton_class.const_get(:B).should be_an_instance_of(Class)
end
it "gets constants in the receiver if a string given" do
KernelSpecs::InstEvalOuter::Inner::X_BY_STR.should == 2
end
it "doesn't get constants in the receiver if a block given" do
KernelSpecs::InstEvalOuter::Inner::X_BY_BLOCK.should be_nil
end
it "raises a TypeError when defining methods on an immediate" do
lambda do
1.instance_eval { def foo; end }
end.should raise_error(TypeError)
lambda do
:foo.instance_eval { 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_eval_spec = 1"
(defined? @@__tmp_instance_eval_spec).should be_nil
@@__tmp_instance_eval_spec = 2
1.instance_eval { @@__tmp_instance_eval_spec }.should == 2
Fixnum.__send__(:remove_class_variable, :@@__tmp_instance_eval_spec)
end
end
it "raises a TypeError when defining methods on numerics" do
lambda do
(1.0).instance_eval { def foo; end }
end.should raise_error(TypeError)
lambda do
(1 << 64).instance_eval { def foo; end }
end.should raise_error(TypeError)
end
end
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