State Pattern + Singleton Implementation Test

Design Patterns/src/state/atm/with/singleton/tests/ATMMachineTest.java

@@ -0,0 +1,43 @@
+package state.atm.with.singleton.tests;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import state.atm.with.singleton.*;
+
+import static org.junit.jupiter.api.Assertions.assertAll;
+import static org.junit.jupiter.api.Assertions.assertSame;
+
+class ATMMachineTest {
+
+    private static ATMMachine atmMachine;
+
+    @BeforeAll
+    static void setup() {
+        atmMachine = new ATMMachine();
+    }
+
+    @Test
+    void testATMMachineStartsInReadyState() {
+        assertSame(atmMachine.getAtmState(), NoCard.getInstance(atmMachine));
+    }
+
+    @Test
+    void testATMMachinesStatesAreSingletons() {
+        ATMState noCard = NoCard.getInstance(atmMachine);
+        ATMState hasCard = HasCard.getInstance(atmMachine);
+        ATMState hasPin = HasPin.getInstance(atmMachine);
+        ATMState noCash = NoCash.getInstance(atmMachine);
+
+        ATMState noCardv2 = NoCard.getInstance(atmMachine);
+        ATMState hasCardv2 = HasCard.getInstance(atmMachine);
+        ATMState hasPinv2 = HasPin.getInstance(atmMachine);
+        ATMState noCashv2 = NoCash.getInstance(atmMachine);
+
+        assertAll("All ATMStates Should Be Singletons",
+                () -> assertSame(noCard, noCardv2),
+                () -> assertSame(hasCard, hasCardv2),
+                () -> assertSame(hasPin, hasPinv2),
+                () -> assertSame(noCash, noCashv2)
+        );
+    }
+}