move tests for tasks not implemented

src/test/java/oving7/abstractaccount/CreditAccountTest.java.unimplemented

@@ -0,0 +1,79 @@
+package oving7.abstractaccount;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+public class CreditAccountTest {
+
+	private static final double epsilon = 0.0005;
+
+	private CreditAccount sub;
+
+	@BeforeEach
+	public void setUp() {
+		sub = new CreditAccount(10_000.0);
+	}
+
+	@Test
+	@DisplayName("Check that deposits work as expected")
+	public void testDeposit() {
+		assertEquals(0.0, sub.getBalance(), epsilon, "The account balance was incorrect");
+
+		sub.deposit(10_000.0);
+		assertEquals(10_000.0, sub.getBalance(), epsilon, "The account balance was incorrect");
+
+		assertThrows(IllegalArgumentException.class, () -> {
+			sub.deposit(-10_000.0);
+		}, "Negative deposit should have triggered an IllegalArgumentException!");
+
+		assertEquals(10_000.0, sub.getBalance(), epsilon, "The account balance was incorrect");
+	}
+
+	@Test
+	@DisplayName("Check that withdrawals work as expected")
+	public void testWithdraw() {
+		sub.deposit(20_000.0);
+		sub.withdraw(5000.0);
+		assertEquals(15_000.0, sub.getBalance(), epsilon, "The account balance was incorrect");
+
+		assertThrows(IllegalArgumentException.class, () -> {
+			sub.withdraw(-10_000.0);
+		}, "Negative withdrawal should have triggered an IllegalArgumentException!");
+
+		assertEquals(15_000.0, sub.getBalance(), epsilon, "The account balance was incorrect");
+
+		sub.withdraw(20_000.0);
+		assertEquals(-5000.0, sub.getBalance(), epsilon, "The account balance was incorrect");
+
+		assertThrows(IllegalArgumentException.class, () -> {
+			sub.withdraw(20_000.0);
+		}, "Withdrawal exceeding the credit limit should have triggered an IllegalArgumentException");
+	}
+
+	@Test
+	@DisplayName("Check that the credit limit works as expected")
+	public void testCreditLine() {
+		assertEquals(10_000.0, sub.getCreditLine(), epsilon, "The credit limit was incorrect");
+
+		sub.setCreditLine(5000.0);
+		assertEquals(5000.0, sub.getCreditLine(), epsilon, "The credit limit was incorrect");
+
+		assertThrows(IllegalArgumentException.class, () -> {
+			sub.setCreditLine(-5000.0);
+		}, "Cannot have a negative credit limit");
+
+		assertEquals(5000.0, sub.getCreditLine(), epsilon, "The credit limit was incorrect");
+
+		sub.withdraw(4000.0);
+
+		assertThrows(IllegalStateException.class, () -> {
+			sub.setCreditLine(3000.0);
+		}, "Cannot set a credit limit that would result in an invalid balance");
+
+		assertEquals(-4000.0, sub.getBalance(), epsilon, "The balance was incorrect");
+		assertEquals(5000.0, sub.getCreditLine(), epsilon, "The credit limit was incorrect");
+	}
+}