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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "BasicObject#instance_exec" do
it "is a public instance method" do
BasicObject.should have_public_instance_method(:instance_exec)
end
it "sets self to the receiver in the context of the passed block" do
a = BasicObject.new
a.instance_exec { self }.equal?(a).should be_true
end
it "passes arguments to the block" do
a = BasicObject.new
a.instance_exec(1) { |b| b }.should equal(1)
end
it "raises a LocalJumpError unless given a block" do
-> { "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
-> { "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
-> { 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
BasicObjectSpecs::IVars.new.instance_exec { @secret }.should == 99
end
it "sets class variables in the receiver" do
BasicObjectSpecs::InstExec.class_variables.should include(:@@count)
BasicObjectSpecs::InstExec.send(:class_variable_get, :@@count).should == 2
end
it "raises a TypeError when defining methods on an immediate" do
-> do
1.instance_exec { def foo; end }
end.should raise_error(TypeError)
-> 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 an Integer" do
# Integer can take instance vars
Integer.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
Integer.__send__(:remove_class_variable, :@@__tmp_instance_exec_spec)
end
end
it "raises a TypeError when defining methods on numerics" do
-> do
(1.0).instance_exec { def foo; end }
end.should raise_error(TypeError)
-> do
(1 << 64).instance_exec { def foo; end }
end.should raise_error(TypeError)
end
end
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