add 1 more value for the first test

Author: dbc2201

.idea/workspace.xml

@@ -18,7 +18,7 @@ void setUp() {
     }
 
     @ParameterizedTest
-    @ValueSource(strings = {"abcdefghijklmnopqrstuvwxyz", "dbc", "A", "1234567890"})
+    @ValueSource(strings = {"abcdefghijklmnopqrstuvwxyz", "dbc", "A", "1234567890", " "})
     @DisplayName("should return map of correct size")
     void shouldReturnMapOfCorrectSize(String input) {
         // Act