update(tests): update interpreter tests

test/TestInterpreter.cpp

@@ -5,7 +5,6 @@
 #include "Scanner.h"
 #include "gtest/gtest.h"
 #include <Statement.h>
-#include <ios>
 #include <string>
 #include <vector>
 
@@ -48,18 +47,15 @@ TEST(InterpreterTest, TestTernaryExpression) {
 
 TEST(InterpreterTest, TestVarStatement) {
   std::string test = "var a = 10; print(a);";
-
   Scanner scan(test);
-
   std::vector<Token> token = scan.scanTokens();
-
   Parser parser(token);
   std::vector<Statement *> statement = parser.parse();
-
   testing::internal::CaptureStdout();
   Interpreter *interpreter = new Interpreter();
   interpreter->interpret(statement);
   std::string result = testing::internal::GetCapturedStdout();
+  ASSERT_EQ(result, "10.000000\n");
   delete interpreter;
 }
 
@@ -74,6 +70,7 @@ TEST(InterpreterTest, TestIfStatement) {
   interpreter->interpret(statements);
   std::string result = testing::internal::GetCapturedStdout();
   ASSERT_EQ(result, "equal\n");
+  delete interpreter;
 }
 
 TEST(InterpreterTest, TestIfElseStatement) {