Credentials Test

test/java/CredentialsTest.java

 class CredentialsTest {
 
     @Test
-    void valid() {
+    void existingCheck() {
+        Credentials cred = new Credentials("apple", "windows");
+        assertNotNull(cred);
     }
+
+    @Test
+    void validData() {
+        Credentials cred = new Credentials("hofmannol", "GERONIMO");
+        assertTrue(cred.valid());
+    }
+
 }