small fixes to make tests pass again

test/compiler/test_methods.rb

@@ -44,6 +44,9 @@ HERE
   def test_puts_string
     @string_input    = <<HERE
 class Object
+  int puts(ref str)
+    return str
+  end
   int main()
     puts("Hello")
   end

test/fragments/test_if.rb

@@ -7,6 +7,7 @@ class TestIf < MiniTest::Test
     @string_input = <<HERE
 class Object
   int main()
+    int n = 10
     if( n < 12)
       3
     else

test/fragments/test_recursive_fibo.rb

@@ -5,11 +5,7 @@ class TestRecursinveFibo < MiniTest::Test
 
   def test_recursive_fibo
     @string_input = <<HERE
-class Integer
-  int fib_print(int n)
-    int fib = fibonaccir( n )
-    fib.putint()
-  end
+class Object
   int fibonaccir( int n )
     if( n <= 1 )
       return n
@@ -22,8 +18,10 @@ class Integer
       return a + b
     end
   end
-end
-class Object
+  int fib_print(int n)
+    int fib = fibonaccir( n )
+    fib.putint()
+  end
   int main()
     fib_print(10)
   end