add tests for Pry::Code

lib/pry/code.rb

@@ -263,10 +263,30 @@ class Pry
       lines.map { |l| "#{l.first}\n" }.join
     end
 
+    # Return the number of lines stored.
+    #
+    # @return [Fixnum]
+    def length
+      @lines ? @lines.length : 0
+    end
+
+    # Two `Code` objects are equal if they contain the same lines with the same
+    # numbers.
+    #
+    # @param [Code] other
+    # @return [Boolean]
+    def ==(other)
+      @other_lines = other.instance_variable_get(:@lines)
+      @lines.each_with_index.all? do |(l, ln), i|
+        l == @other_lines[i].first && ln == @other_lines[i].last
+      end
+    end
+
     # Forward any missing methods to the output of `#to_s`.
     def method_missing(name, *args, &blk)
       to_s.send(name, *args, &blk)
     end
+    undef =~
 
     protected
       # An abstraction of the `dup.instance_eval` pattern used throughout this

test/test_code.rb

@@ -0,0 +1,157 @@
+require 'helper'
+
+describe Pry::Code do
+  describe '.from_file' do
+    it 'should read lines from a file on disk' do
+      Pry::Code.from_file('lib/pry.rb').length.should > 0
+    end
+
+    it 'should read lines from Pry\'s line buffer' do
+      mock_pry(':hay_guys')
+      Pry::Code.from_file('(pry)').grep(/:hay_guys/).length.should == 1
+    end
+
+    it 'should raise an error if the file doesn\'t exist' do
+      proc do
+        Pry::Code.from_file('/knalkjsdnalsd/alkjdlkq')
+      end.should.raise(Pry::CommandError)
+    end
+  end
+
+  describe '.from_method' do
+    it 'should read lines from a method\'s definition' do
+      m = Pry::Method.from_obj(Pry, :load_history)
+      Pry::Code.from_method(m).length.should > 0
+    end
+  end
+
+  describe '#initialize' do
+    before do
+      @str = Pry::Helpers::CommandHelpers.unindent <<-CODE
+        def hay
+          :guys
+        end
+      CODE
+
+      @array = ['def hay', '  :guys', 'end']
+    end
+
+    it 'should break a string into lines' do
+      Pry::Code.new(@str).length.should == 3
+    end
+
+    it 'should accept an array' do
+      Pry::Code.new(@array).length.should == 3
+    end
+
+    it 'an array or string should produce an equivalent object' do
+      Pry::Code.new(@str).should == Pry::Code.new(@array)
+    end
+  end
+
+  describe 'filters and formatters' do
+    before do
+      @code = Pry::Code(Pry::Helpers::CommandHelpers.unindent <<-STR)
+        class MyProgram
+          def self.main
+            puts 'Hello, world!'
+          end
+        end
+      STR
+    end
+
+    describe 'filters' do
+      describe '#between' do
+        it 'should work with an inclusive range' do
+          @code = @code.between(1..3)
+          @code.length.should == 3
+          @code.should =~ /\Aclass MyProgram/
+          @code.should =~ /world!'\Z/
+        end
+
+        it 'should default to an inclusive range' do
+          @code = @code.between(3, 5)
+          @code.length.should == 3
+        end
+
+        it 'should work with an exclusive range' do
+          @code = @code.between(2...4)
+          @code.length.should == 2
+          @code.should =~ /\A  def self/
+          @code.should =~ /world!'\Z/
+        end
+      end
+
+      describe '#before' do
+        it 'should work' do
+          @code = @code.before(3, 1)
+          @code.should =~ /\A  def self\.main\Z/
+        end
+      end
+
+      describe '#around' do
+        it 'should work' do
+          @code = @code.around(3, 1)
+          @code.length.should == 3
+          @code.should =~ /\A  def self/
+          @code.should =~ /  end\Z/
+        end
+      end
+
+      describe '#after' do
+        it 'should work' do
+          @code = @code.after(3, 1)
+          @code.should =~ /\A  end\Z/
+        end
+      end
+
+      describe '#grep' do
+        it 'should work' do
+          @code = @code.grep(/end/)
+          @code.length.should == 2
+        end
+      end
+    end
+
+    describe 'formatters' do
+      describe '#with_line_numbers' do
+        it 'should show line numbers' do
+          @code = @code.with_line_numbers
+          @code.should =~ /1:/
+        end
+
+        it 'should disable line numbers when falsy' do
+          @code = @code.with_line_numbers
+          @code = @code.with_line_numbers(false)
+          @code.should.not =~ /1:/
+        end
+      end
+
+      describe '#with_marker' do
+        it 'should show a marker in the right place' do
+          @code = @code.with_marker(2)
+          @code.should =~ /^ =>   def self/
+        end
+
+        it 'should disable the marker when falsy' do
+          @code = @code.with_marker(2)
+          @code = @code.with_marker(false)
+          @code.should =~ /^  def self/
+        end
+      end
+
+      describe '#with_indentation' do
+        it 'should indent the text' do
+          @code = @code.with_indentation(2)
+          @code.should =~ /^    def self/
+        end
+
+        it 'should disable the indentation when falsy' do
+          @code = @code.with_indentation(2)
+          @code = @code.with_indentation(false)
+          @code.should =~ /^  def self/
+        end
+      end
+    end
+  end
+end