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Diffstat (limited to 'spec/ruby/core/basicobject/instance_exec_spec.rb')
-rw-r--r-- | spec/ruby/core/basicobject/instance_exec_spec.rb | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/spec/ruby/core/basicobject/instance_exec_spec.rb b/spec/ruby/core/basicobject/instance_exec_spec.rb new file mode 100644 index 0000000000..f41af6f64f --- /dev/null +++ b/spec/ruby/core/basicobject/instance_exec_spec.rb @@ -0,0 +1,107 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +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 + 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 + 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 + 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 |