add while statement tests

test/compiler/statements/test_all.rb

@@ -1,2 +1,5 @@
 require_relative "test_if"
 require_relative "test_return"
+require_relative "test_assign"
+require_relative "test_call"
+require_relative "test_while"

test/compiler/statements/test_while.rb

@@ -0,0 +1,61 @@
+require_relative 'helper'
+
+module Register
+  class TestWhile < MiniTest::Test
+    include Statements
+
+
+    def test_while_mini
+      @string_input    = <<HERE
+class Object
+  int main()
+    while(1)
+      return 3
+    end
+  end
+end
+HERE
+      @expect = [[Virtual::MethodEnter],[LoadConstant,IsZeroBranch,LoadConstant,AlwaysBranch],
+                  [],[Virtual::MethodReturn]]
+      check
+    end
+
+    def test_while_assign
+      @string_input    = <<HERE
+class Object
+  int main()
+    int n = 5
+    while(n > 0)
+      n = n - 1
+    end
+  end
+end
+HERE
+      @expect = [[Virtual::MethodEnter,LoadConstant,SetSlot],[GetSlot,LoadConstant,OperatorInstruction,
+                  IsZeroBranch,GetSlot,LoadConstant,OperatorInstruction,SetSlot,AlwaysBranch],
+                  [],[Virtual::MethodReturn]]
+      check
+    end
+
+
+    def test_while_return
+      @string_input    = <<HERE
+class Object
+  int main()
+    int n = 10
+    while( n > 5)
+      n = n + 1
+      return n
+    end
+  end
+end
+HERE
+      @expect = [[Virtual::MethodEnter,LoadConstant,SetSlot],
+                 [GetSlot,LoadConstant,OperatorInstruction,IsZeroBranch,
+                   GetSlot,LoadConstant,OperatorInstruction,SetSlot,
+                   GetSlot,AlwaysBranch] ,
+                   [],[Virtual::MethodReturn]]
+      check
+    end
+  end
+end