Moved ujit code invalidation test into bootstraptest

bootstraptest/test_ujit.rb

@@ -0,0 +1,30 @@
+# Method redefinition (code invalidation) test
+assert_equal '1', %q{
+    def ret1
+        return 1
+    end
+
+    klass = Class.new do
+        def alias_then_hash(klass, method_to_redefine)
+            # Redefine the method to be ret1
+            klass.alias_method(method_to_redefine, :ret1)
+            hash
+        end
+    end
+
+    instance = klass.new
+
+    i = 0
+    while i < 12
+        if i < 11
+            # Redefine the bar method
+            instance.alias_then_hash(klass, :bar)
+        else
+            # Redefine the hash method to be ret1
+            retval = instance.alias_then_hash(klass, :hash)
+        end
+        i += 1
+    end
+
+    retval
+}

test/ruby/test_microjit.rb

@@ -1,27 +0,0 @@
-# frozen_string_literal: true
-require 'test/unit'
-
-class TestMicroJIT < Test::Unit::TestCase
-  # MicroJIT's code invalidation mechanism can't invalidate
-  # code that is executing. Test that we don't try to do that.
-  def test_code_invalidation
-    klass = Class.new do
-      def alias_then_hash(klass, method_to_redefine)
-        klass.alias_method(method_to_redefine, :itself)
-        hash
-      end
-    end
-
-    instance = klass.new
-    i = 0
-    while i < 12
-      if i < 11
-        instance.alias_then_hash(klass, :bar)
-      else
-        ret = instance.alias_then_hash(klass, :hash)
-        assert(instance.equal?(ret))
-      end
-      i += 1
-    end
-  end
-end