Add ls command test

Author: eikes

test/irb/command/test_ls.rb

@@ -0,0 +1,71 @@
+require "tempfile"
+require_relative "../helper"
+
+module TestIRB
+  class LSTest < IntegrationTestCase
+    def setup
+      super
+
+      write_ruby <<~'RUBY'
+        class Foo
+          class Bar
+            def bar
+              "this is bar"
+            end
+          end
+
+          def foo
+            "this is foo"
+          end
+        end
+
+        class BO < BasicObject
+          ONE = 1
+          def baz
+            "this is baz"
+          end
+        end
+
+        binding.irb
+      RUBY
+    end
+
+    def test_ls_class
+      out = run_ruby_file do
+        type "ls Foo"
+        type "exit"
+      end
+
+      assert_match(/constants: Bar/, out)
+      assert_match(/Foo#methods: foo/, out)
+    end
+
+    def test_ls_instance
+      out = run_ruby_file do
+        type "ls Foo.new"
+        type "exit"
+      end
+
+      assert_match(/Foo#methods: foo/, out)
+    end
+
+    def test_ls_basic_object
+      out = run_ruby_file do
+        type "ls BO"
+        type "exit"
+      end
+
+      assert_match(/constants:.*ONE/, out)
+      assert_match(/BO#methods: baz/, out)
+    end
+
+    def test_ls_basic_object_instance
+      out = run_ruby_file do
+        type "ls BO.new"
+        type "exit"
+      end
+
+      assert_match(/BO#methods: baz/, out)
+    end
+  end
+end