fix: 잘못된 테스트 코드 수정

Author: ksundong

yoonexample/src/test/java/tree/expressiontree/ExpressionTreeTest.java

@@ -45,18 +45,18 @@ void setUp() {
     char[] postfixExpression = infixToPostfix.convertInputToPostfix(infixExpression);
 
     ExpressionTree expressionTree = new ExpressionTreeImpl(postfixExpression);
-    assertThat(expressionTree.evaluateTree()).isEqualTo(3);
+    assertThat(expressionTree.evaluateTree()).isEqualTo(15);
 
     StringBuilder sb = new StringBuilder();
     expressionTree.prefixTypeExpression(sb);
-    assertThat(sb.toString()).isEqualTo("*+127");
+    assertThat(sb.toString()).isEqualTo("+1*27");
 
     sb = new StringBuilder();
     expressionTree.infixTypeExpression(sb);
     assertThat(sb.toString()).isEqualTo("1+2*7");
 
     sb = new StringBuilder();
     expressionTree.postfixTypeExpression(sb);
-    assertThat(sb.toString()).isEqualTo("12+7*");
+    assertThat(sb.toString()).isEqualTo("127*+");
   }
 }