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Diffstat (limited to 'spec/rubyspec/core/kernel/eval_spec.rb')
-rw-r--r-- | spec/rubyspec/core/kernel/eval_spec.rb | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/spec/rubyspec/core/kernel/eval_spec.rb b/spec/rubyspec/core/kernel/eval_spec.rb new file mode 100644 index 0000000000..96fc0f5b71 --- /dev/null +++ b/spec/rubyspec/core/kernel/eval_spec.rb @@ -0,0 +1,216 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +EvalSpecs::A.new.c + +describe "Kernel#eval" do + it "is a private method" do + Kernel.should have_private_instance_method(:eval) + end + + it "is a module function" do + Kernel.respond_to?(:eval).should == true + end + + it "evaluates the code within" do + eval("2 + 3").should == 5 + end + + it "coerces an object to string" do + eval(EvalSpecs::CoercedObject.new).should == 5 + end + + it "evaluates within the scope of the eval" do + EvalSpecs::A::B.name.should == "EvalSpecs::A::B" + end + + it "evaluates such that consts are scoped to the class of the eval" do + EvalSpecs::A::C.name.should == "EvalSpecs::A::C" + end + + it "finds a local in an enclosing scope" do + a = 1 + eval("a").should == 1 + end + + it "updates a local in an enclosing scope" do + a = 1 + eval("a = 2") + a.should == 2 + end + + it "updates a local in a surrounding block scope" do + EvalSpecs.new.f do + a = 1 + eval("a = 2") + a.should == 2 + end + end + + it "updates a local in a scope above a surrounding block scope" do + a = 1 + EvalSpecs.new.f do + eval("a = 2") + a.should == 2 + end + a.should == 2 + end + + it "updates a local in a scope above when modified in a nested block scope" do + a = 1 + es = EvalSpecs.new + eval("es.f { es.f { a = 2 } }") + a.should == 2 + end + + it "finds locals in a nested eval" do + eval('test = 10; eval("test")').should == 10 + end + + it "does not share locals across eval scopes" do + code = fixture __FILE__, "eval_locals.rb" + ruby_exe(code).chomp.should == "NameError" + end + + it "doesn't accept a Proc object as a binding" do + x = 1 + bind = proc {} + + lambda { eval("x", bind) }.should raise_error(TypeError) + end + + it "does not make Proc locals visible to evaluated code" do + bind = proc { inner = 4 } + lambda { eval("inner", bind.binding) }.should raise_error(NameError) + end + + # REWRITE ME: This obscures the real behavior of where locals are stored + # in eval bindings. + it "allows a binding to be captured inside an eval" do + outer_binding = binding + level1 = eval("binding", outer_binding) + level2 = eval("binding", level1) + + eval("x = 2", outer_binding) + eval("y = 3", level1) + + eval("w=1", outer_binding) + eval("w", outer_binding).should == 1 + eval("w=1", level1).should == 1 + eval("w", level1).should == 1 + eval("w=1", level2).should == 1 + eval("w", level2).should == 1 + + eval("x", outer_binding).should == 2 + eval("x=2", level1) + eval("x", level1).should == 2 + eval("x=2", level2) + eval("x", level2).should == 2 + + eval("y=3", outer_binding) + eval("y", outer_binding).should == 3 + eval("y=3", level1) + eval("y", level1).should == 3 + eval("y=3", level2) + eval("y", level2).should == 3 + end + + it "uses the same scope for local variables when given the same binding" do + outer_binding = binding + + eval("if false; a = 1; end", outer_binding) + eval("a", outer_binding).should be_nil + end + + it "allows creating a new class in a binding" do + bind = proc {} + eval("class EvalBindingProcA; end; EvalBindingProcA.name", bind.binding).should =~ /EvalBindingProcA$/ + end + + it "allows creating a new class in a binding created by #eval" do + bind = eval "binding" + eval("class EvalBindingA; end; EvalBindingA.name", bind).should =~ /EvalBindingA$/ + end + + it "includes file and line information in syntax error" do + expected = 'speccing.rb' + lambda { + eval('if true',TOPLEVEL_BINDING, expected) + }.should raise_error(SyntaxError) { |e| + e.message.should =~ /#{expected}:1:.+/ + } + end + + it "evaluates string with given filename and negative linenumber" do + expected_file = 'speccing.rb' + lambda { + eval('if true',TOPLEVEL_BINDING, expected_file, -100) + }.should raise_error(SyntaxError) { |e| + e.message.should =~ /#{expected_file}:-100:.+/ + } + end + + it "sets constants at the toplevel from inside a block" do + # The class Object bit is needed to workaround some mspec oddness + class Object + [1].each { eval "Const = 1"} + Const.should == 1 + remove_const :Const + end + end + + it "uses the filename of the binding if none is provided" do + eval("__FILE__").should == "(eval)" + eval("__FILE__", binding).should == __FILE__ + eval("__FILE__", binding, "success").should == "success" + eval("eval '__FILE__', binding").should == "(eval)" + eval("eval '__FILE__', binding", binding).should == __FILE__ + eval("eval '__FILE__', binding", binding, 'success').should == 'success' + end + + # Found via Rubinius bug github:#149 + it "does not alter the value of __FILE__ in the binding" do + first_time = EvalSpecs.call_eval + second_time = EvalSpecs.call_eval + + # This bug is seen by calling the method twice and comparing the values + # of __FILE__ each time. If the bug is present, calling eval will set the + # value of __FILE__ to the eval's "filename" argument. + + second_time.should_not == "(eval)" + first_time.should == second_time + end + + it "can be aliased" do + alias aliased_eval eval + x = 2 + aliased_eval('x += 40') + x.should == 42 + end + + # See http://jira.codehaus.org/browse/JRUBY-5163 + it "uses the receiver as self inside the eval" do + eval("self").should equal(self) + Kernel.eval("self").should equal(Kernel) + end + + it "does not pass the block to the method being eval'ed" do + lambda { + eval('KernelSpecs::EvalTest.call_yield') { "content" } + }.should raise_error(LocalJumpError) + end + + it "returns from the scope calling #eval when evaluating 'return'" do + lambda { eval("return :eval") }.call.should == :eval + end + + it "unwinds through a Proc-style closure and returns from a lambda-style closure in the closure chain" do + code = fixture __FILE__, "eval_return_with_lambda.rb" + ruby_exe(code).chomp.should == "a,b,c,eval,f" + end + + it "raises a LocalJumpError if there is no lambda-style closure in the chain" do + code = fixture __FILE__, "eval_return_without_lambda.rb" + ruby_exe(code).chomp.should == "a,b,c,e,LocalJumpError,f" + end +end |