Always add input method when calling Irb.new in tests

When passes input method as nil to Context.new through Irb.new,
ReidlineInputMethod.new is executed and the global internal state of Reline is
rewritten, therefore other tests are failed in the Ruby repository. This
commit changes to use TestInputMethod.

Author: aycabta

test/irb/test_cmd.rb

@@ -5,6 +5,32 @@
 
 module TestIRB
   class ExtendCommand < Test::Unit::TestCase
+    class TestInputMethod < ::IRB::InputMethod
+      attr_reader :list, :line_no
+
+      def initialize(list = [])
+        super("test")
+        @line_no = 0
+        @list = list
+      end
+
+      def gets
+        @list[@line_no]&.tap {@line_no += 1}
+      end
+
+      def eof?
+        @line_no >= @list.size
+      end
+
+      def encoding
+        Encoding.default_external
+      end
+
+      def reset
+        @line_no = 0
+      end
+    end
+
     def setup
       @pwd = Dir.pwd
       @tmpdir = File.join(Dir.tmpdir, "test_reline_config_#{$$}")
@@ -44,12 +70,12 @@ def test_irb_info_multiline
       IRB.conf[:USE_SINGLELINE] = false
       IRB.conf[:VERBOSE] = false
       workspace = IRB::WorkSpace.new(self)
-      irb = IRB::Irb.new(workspace)
+      irb = IRB::Irb.new(workspace, TestInputMethod.new([]))
       IRB.conf[:MAIN_CONTEXT] = irb.context
       expected = %r{
         Ruby\sversion: .+\n
         IRB\sversion:\sirb .+\n
-        InputMethod:\sReidlineInputMethod\swith\sReline .+ and .+\n
+        InputMethod:\sAbstract\sInputMethod\n
         \.irbrc\spath: .+\n
         RUBY_PLATFORM: .+
       }x
@@ -64,12 +90,12 @@ def test_irb_info_singleline
       IRB.conf[:USE_SINGLELINE] = true
       IRB.conf[:VERBOSE] = false
       workspace = IRB::WorkSpace.new(self)
-      irb = IRB::Irb.new(workspace)
+      irb = IRB::Irb.new(workspace, TestInputMethod.new([]))
       IRB.conf[:MAIN_CONTEXT] = irb.context
       expected = %r{
         Ruby\sversion: .+\n
         IRB\sversion:\sirb .+\n
-        InputMethod:\sReadlineInputMethod\swith .+ and .+\n
+        InputMethod:\sAbstract\sInputMethod\n
         \.irbrc\spath: .+\n
         RUBY_PLATFORM: .+
       }x
@@ -87,12 +113,12 @@ def test_irb_info_multiline_without_rc_files
       IRB.conf[:USE_SINGLELINE] = false
       IRB.conf[:VERBOSE] = false
       workspace = IRB::WorkSpace.new(self)
-      irb = IRB::Irb.new(workspace)
+      irb = IRB::Irb.new(workspace, TestInputMethod.new([]))
       IRB.conf[:MAIN_CONTEXT] = irb.context
       expected = %r{
         Ruby\sversion: .+\n
         IRB\sversion:\sirb .+\n
-        InputMethod:\sReidlineInputMethod\swith\sReline\s[^ ]+(?!\sand\s.+)\n
+        InputMethod:\sAbstract\sInputMethod\n
         RUBY_PLATFORM: .+\n
         \z
       }x
@@ -114,12 +140,12 @@ def test_irb_info_singleline_without_rc_files
       IRB.conf[:USE_SINGLELINE] = true
       IRB.conf[:VERBOSE] = false
       workspace = IRB::WorkSpace.new(self)
-      irb = IRB::Irb.new(workspace)
+      irb = IRB::Irb.new(workspace, TestInputMethod.new([]))
       IRB.conf[:MAIN_CONTEXT] = irb.context
       expected = %r{
         Ruby\sversion: .+\n
         IRB\sversion:\sirb .+\n
-        InputMethod:\sReadlineInputMethod\swith\s(?~.*\sand\s.+)\n
+        InputMethod:\sAbstract\sInputMethod\n
         RUBY_PLATFORM: .+\n
         \z
       }x
@@ -130,32 +156,6 @@ def test_irb_info_singleline_without_rc_files
       IRB.const_set(:IRBRC_EXT, ext_backup)
     end
 
-    class TestInputMethod < ::IRB::InputMethod
-      attr_reader :list, :line_no
-
-      def initialize(list = [])
-        super("test")
-        @line_no = 0
-        @list = list
-      end
-
-      def gets
-        @list[@line_no]&.tap {@line_no += 1}
-      end
-
-      def eof?
-        @line_no >= @list.size
-      end
-
-      def encoding
-        Encoding.default_external
-      end
-
-      def reset
-        @line_no = 0
-      end
-    end
-
     def test_measure
       IRB.init_config(nil)
       IRB.conf[:PROMPT] = {
@@ -376,15 +376,14 @@ def test_irb_load
     end
 
     def test_ls
+      input = TestInputMethod.new([
+        "ls Object.new.tap { |o| o.instance_variable_set(:@a, 1) }\n",
+      ])
       IRB.init_config(nil)
       workspace = IRB::WorkSpace.new(self)
+      irb = IRB::Irb.new(workspace, input)
       IRB.conf[:VERBOSE] = false
-      irb = IRB::Irb.new(workspace)
       IRB.conf[:MAIN_CONTEXT] = irb.context
-      input = TestInputMethod.new([
-        "ls Object.new.tap { |o| o.instance_variable_set(:@a, 1) }\n",
-      ])
-      irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)
       irb.context.return_format = "=> %s\n"
       out, err = capture_output do
         irb.eval_input
@@ -394,15 +393,14 @@ def test_ls
     end
 
     def test_whereami
+      input = TestInputMethod.new([
+        "whereami\n",
+      ])
       IRB.init_config(nil)
       workspace = IRB::WorkSpace.new(self)
+      irb = IRB::Irb.new(workspace, input)
       IRB.conf[:VERBOSE] = false
-      irb = IRB::Irb.new(workspace)
       IRB.conf[:MAIN_CONTEXT] = irb.context
-      input = TestInputMethod.new([
-        "whereami\n",
-      ])
-      irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)
       irb.context.return_format = "=> %s\n"
       out, err = capture_output do
         irb.eval_input