add a case check test on the decrypt method

Author: pwnipc

src/main/java/CaesarShift.java

@@ -5,8 +5,8 @@ public class CaesarShift {
     private static int key = 25; //Initialize and encapsulate the shift key
     private static String encryptedMsg; //Create and encapsulate the message container
 
-    public String encrypt(String msg){
-        String upCased = msg.toUpperCase();
+    public String encrypt(String encryptMsg){
+        String upCased = encryptMsg.toUpperCase();
         char[] upCasedArrs = upCased.toCharArray();//split the string to a character array
         ArrayList<Character> encryptedChars = new ArrayList<Character>();
 
@@ -20,4 +20,8 @@ public String encrypt(String msg){
       return encryptedMsg;
     }
 
+    public String decrypt(String decryptMsg){
+        return decryptMsg.toUpperCase();
+    }
+
 }

src/test/java/CaesarShiftTest.java

@@ -4,20 +4,26 @@
 
 class CaesarShiftTest {
     @Test
-    public void caesarShift_convertCase_String() {
-        CaesarShift testCase = new CaesarShift();
-        assertEquals("Z", testCase.encrypt("a"));
-    }
-
-    @Test
-    public void caesarShift_encryptSingleChar_String(){
-        CaesarShift encryptChar = new CaesarShift();
-        assertEquals("Y", encryptChar.encrypt("Z"));
+    public void caesarShift_encryptCheckCase_Boolean() {
+        CaesarShift checkCase = new CaesarShift();
+        assertEquals(true, Character.isUpperCase(checkCase.encrypt("a").charAt(0)));
     }
 
     @Test
     void caesarShift_encryptString_String() {
         CaesarShift encryptString = new CaesarShift();
         assertEquals("GDKKN", encryptString.encrypt("hello"));
     }
+
+    @Test
+    void caesarShift_decryptCheckCase_Boolean() {
+        CaesarShift checkCase = new CaesarShift();
+        assertEquals(true, Character.isUpperCase(checkCase.decrypt("z").charAt(0)));
+    }
+
+    @Test
+    public void caesarShift_decryptString_String(){
+        CaesarShift decryptStr = new CaesarShift();
+        assertEquals("HELLO", decryptStr.decrypt("GDKKN"));
+    }
 }