clearer organization for compiler tests

was slightly messy with small/large
now needed different test for expression and statements

test/compiler/fragments/test_if.rb

@@ -0,0 +1,58 @@
+require_relative 'helper'
+
+class TestIf < MiniTest::Test
+  include Fragments
+
+  def test_if_basic
+    @string_input = <<HERE
+class Object
+  int main()
+    int n = 10
+    if( n < 12)
+      return 3
+    else
+      return 4
+    end
+  end
+end
+HERE
+  @expect =  [[Virtual::MethodEnter,Virtual::Set,Virtual::Set,Register::GetSlot,
+                Register::GetSlot,Register::OperatorInstruction,Register::IsZeroBranch] ,
+                [Virtual::Set,Register::AlwaysBranch] ,[Virtual::Set] ,[] ,[Virtual::MethodReturn] ]
+  check
+  end
+
+  def test_return
+    @string_input = <<HERE
+class Object
+  int main()
+    return 5
+  end
+end
+HERE
+  @expect =  [[Virtual::MethodEnter,Virtual::Set] , [Virtual::MethodReturn]]
+  check
+  end
+
+
+  def test_if_function
+    @string_input = <<HERE
+class Object
+  int itest(int n)
+    if( n < 12)
+      "then".putstring()
+    else
+      "else".putstring()
+    end
+  end
+
+  int main()
+    itest(20)
+  end
+end
+HERE
+    @expect =  [ [Virtual::MethodEnter,Register::GetSlot,Virtual::Set,Virtual::Set,
+                  Virtual::Set,Virtual::Set,Virtual::MethodCall] ,[Virtual::MethodReturn] ]
+  check
+  end
+end