add test

Test/TestParser.hs

@@ -179,6 +179,9 @@ testStatementIfThenElse = TestCase $
 testStatementWhile = TestCase $
     assertEqual "expect while" [While (Reference "a") (Block [Block []])] $
     parseStatement [WHILE,LBRACE,IDENTIFIER "a",RBRACE,LBRACKET,RBRACKET]
+testStatementAssign = TestCase $
+    assertEqual "expect assign 5" [StatementExpressionStatement (Assignment (Reference "a") (IntegerLiteral 5))] $
+    parseStatement [IDENTIFIER "a",ASSIGN,INTEGERLITERAL 5,SEMICOLON]
 
 
 
@@ -233,5 +236,6 @@ tests = TestList [
     testExpressionPrecedence,
     testStatementIfThen,
     testStatementIfThenElse,
-    testStatementWhile
+    testStatementWhile,
+    testStatementAssign
     ]