improve method test

mostly by actually testing main, which is what is checked

test/compiler/test_methods.rb

@@ -5,39 +5,29 @@ module Virtual
   class TestMethods < MiniTest::Test
     include CodeChecker
 
-    def test_module
+    def test_simplest_function
       @string_input    = <<HERE
-class Some
-  int foo()
+class Object
+  int main()
     return 5
   end
 end
 HERE
-      @output = [[MethodEnter] ,[MethodReturn]]
+      @output = [[MethodEnter,Set] ,[MethodReturn]]
       check
     end
 
-    def test_simplest_function
-      @string_input    = <<HERE
-class Object
-  int foo(int x)
-    return x
-  end
-end
-HERE
-      @output = [[MethodEnter] ,[MethodReturn]]
-      check
-    end
 
     def test_second_simplest_function
       @string_input    = <<HERE
 class Object
-  ref foo(ref x)
+  int main()
+    int x = 5
     return x
   end
 end
 HERE
-    @output = [[Virtual::MethodEnter],[Virtual::MethodReturn]]
+      @output = [[Virtual::MethodEnter,Set],[Virtual::MethodReturn]]
       check
     end
 
@@ -86,16 +76,17 @@ HERE
     def test_function_if
       @string_input    = <<HERE
 class Object
-  int ofthen(int n)
+  int main()
     if(0)
-      int isit = 42
+      return 42
     else
-      int maybenot = 667
+      return 667
     end
   end
 end
 HERE
-    @output = [[Virtual::MethodEnter] , [Virtual::MethodReturn]]
+      @output = [[MethodEnter,Set,Register::IsZeroBranch] , [Set,Register::AlwaysBranch],
+                  [Set],[],[MethodReturn]]
       check
     end
 
@@ -145,7 +136,8 @@ HERE
     def test_function_return_if
       @string_input    = <<HERE
 class Object
-  int retvar(int n)
+  int main()
+    int n = 10
     if( n > 5)
       return 10
     else
@@ -154,45 +146,29 @@ class Object
   end
 end
 HERE
-    @output = [[Virtual::MethodEnter],[Virtual::MethodReturn]]
+      @output = [[MethodEnter,Set,Set,Register::GetSlot,Register::GetSlot,
+                  Register::OperatorInstruction,Register::IsZeroBranch],
+                  [Set,Register::AlwaysBranch],[Set],[],[MethodReturn]]
       check
     end
 
     def test_function_return_while
       @string_input    = <<HERE
 class Object
-  int retvar(int n)
-    while( n > 5) do
+  int main()
+    int n = 10
+    while( n > 5)
       n = n + 1
       return n
     end
   end
 end
 HERE
-    @output = [[Virtual::MethodEnter],[Virtual::MethodReturn]]
-    check
-  end
-
-  def test_function_big_while
-    @string_input    = <<HERE
-class Object
-  int puts(int i)
-    return 0
-  end
-  int fibonaccit(int n)
-    int a = 0
-    int b = 1
-    while( n > 1 )
-      int tmp = a
-      a = b
-      b = tmp + b
-      puts(b)
-      n = n - 1
-    end
-  end
-end
-HERE
-    @output = [[Virtual::MethodEnter],[Virtual::MethodReturn]]
+      @output = [[MethodEnter,Set],
+                 [Set,Register::GetSlot,Register::GetSlot,Register::OperatorInstruction,
+                   Register::IsZeroBranch,Set,Register::GetSlot,Register::GetSlot,
+                   Register::OperatorInstruction,Set,Register::AlwaysBranch] ,
+                   [],[MethodReturn]]
       check
     end
   end