pry--pry/spec/pry_spec.rb

require_relative 'helper'

describe Pry do
  before do
    @str_output = StringIO.new
  end

  describe "Exotic object support" do
    # regression test for exotic object support
    it "Should not error when return value is a BasicObject instance" do
      ReplTester.start do
        input('BasicObject.new').should =~ /^=> #<BasicObject:/
      end
    end
  end

  describe 'DISABLE_PRY' do
    before do
      ENV['DISABLE_PRY'] = 'true'
    end

    after do
      ENV.delete 'DISABLE_PRY'
    end

    it 'should not binding.pry' do
      binding.pry.should == nil
    end

    it 'should not Pry.start' do
      Pry.start.should == nil
    end
  end

  describe "Pry.critical_section" do
    it "should prevent Pry being called" do
      output = StringIO.new
      Pry.config.output = output
      Pry.critical_section do
        Pry.start
      end
      output.string.should =~ /Pry started inside Pry/
    end
  end

  describe "Pry.binding_for" do

    # regression test for burg's bug (see git history)
    it "Should not error when object doesn't have a valid == method" do
      o = Object.new
      def o.==(other)
        raise
      end

      lambda { Pry.binding_for(o) }.should.not.raise Exception
    end

    it "should not leak local variables" do
      [Object.new, Array, 3].each do |obj|
        Pry.binding_for(obj).eval("local_variables").should.be.empty
      end
    end

    it "should work on frozen objects" do
      a = "hello".freeze
      Pry.binding_for(a).eval("self").should.equal? a
    end
  end

  describe "#last_exception=" do
    before do
      @pry = Pry.new binding: binding
      @e = mock_exception "foo.rb:1"
    end

    it "returns an instance of Pry::LastException" do
      @pry.last_exception = @e
      @pry.last_exception.wrapped_exception.should == @e
    end

    it "returns a frozen exception" do
      @pry.last_exception = @e.freeze
      @pry.last_exception.should.be.frozen?
    end

    it "returns an object who mirrors itself as the wrapped exception" do
      @pry.last_exception = @e.freeze
      @pry.last_exception.should.be.instance_of?(StandardError)
    end
  end

  describe "open a Pry session on an object" do
    describe "rep" do
      before do
        class Hello
        end
      end

      after do
        Object.send(:remove_const, :Hello)
      end

      # bug fix for https://github.com/banister/pry/issues/93
      it 'should not leak pry constants into Object namespace' do
        lambda{
          pry_eval(Object.new, "Command")
        }.should.raise(NameError)
      end

      it 'should be able to operate inside the BasicObject class' do
        pry_eval(BasicObject, ":foo", "Pad.obj = _")
        Pad.obj.should == :foo
      end

      it 'should set an ivar on an object' do
        o = Object.new
        pry_eval(o, "@x = 10")
        o.instance_variable_get(:@x).should == 10
      end

      it 'should display error if Pry instance runs out of input' do
        redirect_pry_io(StringIO.new, @str_output) do
          Pry.start
        end
        @str_output.string.should =~ /Error: Pry ran out of things to read/
      end

      it 'should make self evaluate to the receiver of the rep session' do
        o = :john
        pry_eval(o, "self").should == o
      end

      it 'should define a nested class under Hello and not on top-level or Pry' do
        mock_pry(Pry.binding_for(Hello), "class Nested", "end")
        Hello.const_defined?(:Nested).should == true
      end

      it 'should suppress output if input ends in a ";" and is an Exception object (single line)' do
        mock_pry("Exception.new;").should == ""
      end

      it 'should suppress output if input ends in a ";" (single line)' do
        mock_pry("x = 5;").should == ""
      end

      it 'should be able to evaluate exceptions normally' do
        was_called = false
        mock_pry("RuntimeError.new", :exception_handler => proc{ was_called = true })
        was_called.should == false
      end

      it 'should notice when exceptions are raised' do
        was_called = false
        mock_pry("raise RuntimeError", :exception_handler => proc{ was_called = true })
        was_called.should == true
      end

      it 'should not try to catch intended exceptions' do
        lambda { mock_pry("raise SystemExit") }.should.raise SystemExit
        # SIGTERM
        lambda { mock_pry("raise SignalException.new(15)") }.should.raise SignalException
      end

      describe "multi-line input" do
        it "works" do
          mock_pry('x = ', '1 + 4').should =~ /5/
        end

        it 'should suppress output if input ends in a ";" (multi-line)' do
          mock_pry('def self.blah', ':test', 'end;').should == ''
        end

        describe "newline stripping from an empty string" do
          it "with double quotes" do
            mock_pry('"', '"').should =~ %r|"\\n"|
            mock_pry('"', "\n", "\n", "\n", '"').should =~ %r|"\\n\\n\\n\\n"|
          end

          it "with single quotes" do
            mock_pry("'", "'").should =~ %r|"\\n"|
            mock_pry("'", "\n", "\n", "\n", "'").should =~ %r|"\\n\\n\\n\\n"|
          end

          it "with fancy delimiters" do
            mock_pry('%(', ')').should =~ %r|"\\n"|
            mock_pry('%|', "\n", "\n", '|').should =~ %r|"\\n\\n\\n"|
            mock_pry('%q[', "\n", "\n", ']').should =~ %r|"\\n\\n\\n"|
          end
        end

        describe "newline stripping from an empty regexp" do
          it "with regular regexp delimiters" do
            mock_pry('/', '/').should =~ %r{/\n/}
          end

          it "with fancy delimiters" do
            mock_pry('%r{', "\n", "\n", '}').should =~ %r{/\n\n\n/}
            mock_pry('%r<', "\n", '>').should =~ %r{/\n\n/}
          end
        end

        describe "newline from an empty heredoc" do
          it "works" do
            mock_pry('<<HERE', 'HERE').should =~ %r|""|
            mock_pry("<<'HERE'", "\n", 'HERE').should =~ %r|"\\n"|
            mock_pry("<<-'HERE'", "\n", "\n", 'HERE').should =~ %r|"\\n\\n"|
          end
        end
      end
    end

    describe "repl" do
      describe "basic functionality" do
        it 'should set an ivar on an object and exit the repl' do
          input_strings = ["@x = 10", "exit-all"]
          input = InputTester.new(*input_strings)

          o = Object.new

          pry_tester = Pry.start(o, :input => input, :output => StringIO.new)

          o.instance_variable_get(:@x).should == 10
        end
      end

      describe "complete_expression?" do
        it "should not mutate the input!" do
          clean = "puts <<-FOO\nhi\nFOO\n"
          a = clean.dup
          Pry::Code.complete_expression?(a)
          a.should == clean
        end
      end

      describe "history arrays" do
        it 'sets _ to the last result' do
          t = pry_tester
          t.eval ":foo"
          t.eval("_").should == :foo
          t.eval "42"
          t.eval("_").should == 42
        end

        it 'sets out to an array with the result' do
          t = pry_tester
          t.eval ":foo"
          t.eval "42"
          res = t.eval "_out_"

          res.should.be.kind_of Pry::HistoryArray
          res[1..2].should == [:foo, 42]
        end

        it 'sets _in_ to an array with the entered lines' do
          t = pry_tester
          t.eval ":foo"
          t.eval "42"
          res = t.eval "_in_"

          res.should.be.kind_of Pry::HistoryArray
          res[1..2].should == [":foo\n", "42\n"]
        end

        it 'uses 100 as the size of _in_ and _out_' do
          pry_tester.eval("[_in_.max_size, _out_.max_size]").should == [100, 100]
        end

        it 'can change the size of the history arrays' do
          pry_tester(:memory_size => 1000).eval("[_out_, _in_].map(&:max_size)").should == [1000, 1000]
        end

        it 'store exceptions' do
          mock_pry("foo!", "Pad.in = _in_[-1]; Pad.out = _out_[-1]")

          Pad.in.should == "foo!\n"
          Pad.out.should.be.kind_of NoMethodError
        end
      end

      describe "last_result" do
        it "should be set to the most recent value" do
          pry_eval("2", "_ + 82").should == 84
        end

        # This test needs mock_pry because the command retvals work by
        # replacing the eval_string, so _ won't be modified without Pry doing
        # a REPL loop.
        it "should be set to the result of a command with :keep_retval" do
          Pry::Commands.block_command '++', '', :keep_retval => true do |a|
            a.to_i + 1
          end

          mock_pry('++ 86', '++ #{_}').should =~ /88/
        end

        it "should be preserved over an empty line" do
          pry_eval("2 + 2", " ", "\t",  " ", "_ + 92").should == 96
        end

        it "should be preserved when evalling a  command without :keep_retval" do
          pry_eval("2 + 2", "ls -l", "_ + 96").should == 100
        end
      end

      describe "nesting" do
        after do
          Pry.reset_defaults
          Pry.config.color = false
        end

        it 'should nest properly' do
          Pry.config.input = InputTester.new("cd 1", "cd 2", "cd 3", "\"nest:\#\{(_pry_.binding_stack.size - 1)\}\"", "exit-all")

          Pry.config.output = @str_output

          o = Object.new

          pry_tester = o.pry
          @str_output.string.should =~ /nest:3/
        end
      end

      describe "defining methods" do
        it 'should define a method on the singleton class of an object when performing "def meth;end" inside the object' do
          [Object.new, {}, []].each do |val|
            pry_eval(val, 'def hello; end')
            val.methods(false).map(&:to_sym).include?(:hello).should == true
          end
        end

        it 'should define an instance method on the module when performing "def meth;end" inside the module' do
          hello = Module.new
          pry_eval(hello, "def hello; end")
          hello.instance_methods(false).map(&:to_sym).include?(:hello).should == true
        end

        it 'should define an instance method on the class when performing "def meth;end" inside the class' do
          hello = Class.new
          pry_eval(hello, "def hello; end")
          hello.instance_methods(false).map(&:to_sym).include?(:hello).should == true
        end

        it 'should define a method on the class of an object when performing "def meth;end" inside an immediate value or Numeric' do
          [:test, 0, true, false, nil,
              (0.0 unless Pry::Helpers::BaseHelpers.jruby?)].each do |val|
            pry_eval(val, "def hello; end");
            val.class.instance_methods(false).map(&:to_sym).include?(:hello).should == true
          end
        end
      end

      describe "Object#pry" do

        after do
          Pry.reset_defaults
          Pry.config.color = false
        end

        it "should start a pry session on the receiver (first form)" do
          Pry.config.input = InputTester.new("self", "exit-all")

          str_output = StringIO.new
          Pry.config.output = str_output

          20.pry

          str_output.string.should =~ /20/
        end

        it "should start a pry session on the receiver (second form)" do
          Pry.config.input = InputTester.new("self", "exit-all")

          str_output = StringIO.new
          Pry.config.output = str_output

          pry 20

          str_output.string.should =~ /20/
        end

        it "should raise if more than two arguments are passed to Object#pry" do
          lambda { pry(20, :quiet, :input => Readline) }.should.raise ArgumentError
        end
      end

      describe "Pry.binding_for" do
        it 'should return TOPLEVEL_BINDING if parameter self is main' do
          _main_ = lambda { TOPLEVEL_BINDING.eval('self') }
          Pry.binding_for(_main_.call).is_a?(Binding).should == true
          Pry.binding_for(_main_.call).should == TOPLEVEL_BINDING
          Pry.binding_for(_main_.call).should == Pry.binding_for(_main_.call)
        end
      end
    end
  end

  describe 'setting custom options' do
    it 'should not raise for unrecognized options' do
      should.not.raise?(NoMethodError) {
        instance = Pry.new(:custom_option => 'custom value')
      }
    end
  end

  describe "a fresh instance" do
    it "should use `caller` as its backtrace" do
      location  = "#{__FILE__}:#{__LINE__ + 1}"[1..-1] # omit leading .
      backtrace = Pry.new.backtrace

      backtrace.should.not.be.nil
      backtrace.any? { |l| l.include?(location) }.should.be.true
    end
  end
end