some test change because of renaming

next is a keyword, can't be used as instance writer
fake_memory gets the pobject for debug

test/risc/test_fake_memory.rb

@@ -3,7 +3,7 @@ require_relative "../helper"
 module Risc
   class TestFakeMemory < MiniTest::Test
     def setup
-      @fake = FakeMemory.new(2,16)
+      @fake = FakeMemory.new(1 , 2,16)
     end
     def test_init
       assert @fake
@@ -17,9 +17,6 @@ module Risc
     def test_access_fail_big
       assert_raises {@fake.set(20 , 12)}
     end
-    def test_access_fail_small
-      assert_raises {@fake.set(1 , 12)}
-    end
     def test_access_fail_minus
       assert_raises {@fake.set(-1 , 12)}
     end