[ruby/irb] Move input processing out of RubyLex

(https://github.com/ruby/irb/pull/683)

* Add a test case for Ctrl-C handling

* Test symbol aliases with integration tests

There are a few places that also need to check symbol aliases before
`Irb#eval_input`. But since the current command test skip them, we
don't have test coverage on them.

* Move each_top_level_statement and readmultiline to Irb

This will save RubyLex from knowning information about commands and aliases.

https://github.com/ruby/irb/commit/69cb5b5615

3 files changed, 77 insertions, 17 deletions

diff --git a/test/irb/test_cmd.rb b/test/irb/test_cmd.rb
index 272f6d3ace..670078679f 100644
--- a/test/irb/test_cmd.rb
+++ b/test/irb/test_cmd.rb
@@ -62,23 +62,6 @@ module TestIRB
     end
   end
 
-  class CommnadAliasTest < CommandTestCase
-    def test_vars_with_aliases
-      @foo = "foo"
-      $bar = "bar"
-      out, err = execute_lines(
-        "@foo\n",
-        "$bar\n",
-      )
-      assert_empty err
-      assert_match(/"foo"/, out)
-      assert_match(/"bar"/, out)
-    ensure
-      remove_instance_variable(:@foo)
-      $bar = nil
-    end
-  end
-
   class InfoTest < CommandTestCase
     def setup
       super
diff --git a/test/irb/test_irb.rb b/test/irb/test_irb.rb
index b613cc8a9a..c685912093 100644
--- a/test/irb/test_irb.rb
+++ b/test/irb/test_irb.rb
@@ -4,6 +4,67 @@ require "irb"
 require_relative "helper"
 
 module TestIRB
+  class InputTest < IntegrationTestCase
+    def test_symbol_aliases_are_handled_correctly
+      write_ruby <<~'RUBY'
+        class Foo
+        end
+        binding.irb
+      RUBY
+
+      output = run_ruby_file do
+        type "$ Foo"
+        type "exit!"
+      end
+
+      assert_include output, "From: #{@ruby_file.path}:1"
+    end
+
+    def test_symbol_aliases_are_handled_correctly_with_singleline_mode
+      @irbrc = Tempfile.new('irbrc')
+      @irbrc.write <<~RUBY
+        IRB.conf[:USE_SINGLELINE] = true
+      RUBY
+      @irbrc.close
+      @envs['IRBRC'] = @irbrc.path
+
+      write_ruby <<~'RUBY'
+        class Foo
+        end
+        binding.irb
+      RUBY
+
+      output = run_ruby_file do
+        type "irb_info"
+        type "$ Foo"
+        type "exit!"
+      end
+
+      # Make sure it's tested in singleline mode
+      assert_include output, "InputMethod: ReadlineInputMethod"
+      assert_include output, "From: #{@ruby_file.path}:1"
+    ensure
+      @irbrc.unlink if @irbrc
+    end
+
+    def test_symbol_aliases_dont_affect_ruby_syntax
+      write_ruby <<~'RUBY'
+        $foo = "It's a foo"
+        @bar = "It's a bar"
+        binding.irb
+      RUBY
+
+      output = run_ruby_file do
+        type "$foo"
+        type "@bar"
+        type "exit!"
+      end
+
+      assert_include output, "=> \"It's a foo\""
+      assert_include output, "=> \"It's a bar\""
+    end
+  end
+
   class IrbIOConfigurationTest < TestCase
     Row = Struct.new(:content, :current_line_spaces, :new_line_spaces, :indent_level)
 
diff --git a/test/irb/yamatanooroti/test_rendering.rb b/test/irb/yamatanooroti/test_rendering.rb
index 6da7fded2b..3da3935c19 100644
--- a/test/irb/yamatanooroti/test_rendering.rb
+++ b/test/irb/yamatanooroti/test_rendering.rb
@@ -251,6 +251,22 @@ class IRB::RenderingTest < Yamatanooroti::TestCase
     EOC
   end
 
+  def test_ctrl_c_is_handled
+    write_irbrc <<~'LINES'
+      puts 'start IRB'
+    LINES
+    start_terminal(40, 80, %W{ruby -I#{@pwd}/lib #{@pwd}/exe/irb}, startup_message: 'start IRB')
+    # Assignment expression code that turns into non-assignment expression after evaluation
+    write("\C-c")
+    close
+    assert_screen(<<~EOC)
+      start IRB
+      irb(main):001>
+      ^C
+      irb(main):001>
+    EOC
+  end
+
   def test_show_cmds_with_pager_can_quit_with_ctrl_c
     write_irbrc <<~'LINES'
       puts 'start IRB'