Added unit tests for formatter classes.

src/test/java/com/github/prominence/carrepair/formatter/CustomDateTimeFormatterUnitTest.java

@@ -0,0 +1,43 @@
+package com.github.prominence.carrepair.formatter;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.time.LocalDateTime;
+import java.time.format.DateTimeParseException;
+
+import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
+
+@RunWith(SpringRunner.class)
+public class CustomDateTimeFormatterUnitTest {
+
+    private CustomDateTimeFormatter customDateTimeFormatter = new CustomDateTimeFormatter();
+
+    @Test
+    public void whenParseNull_thenReturnNull() {
+        assertThat(customDateTimeFormatter.parse(null, null)).isNull();
+    }
+
+    @Test
+    public void whenPrintNull_thenReturnNUll() {
+        assertThat(customDateTimeFormatter.print(null, null)).isNull();
+    }
+
+    @Test
+    public void whenParseCorrectValue_thenReturnLocalDateTime() {
+        LocalDateTime expectedLocalDateTime = LocalDateTime.of(1996, 2, 7, 14, 12, 12);
+        assertThat(customDateTimeFormatter.parse("1996-02-07 14:12:12", null)).isEqualTo(expectedLocalDateTime);
+    }
+
+    @Test(expected = DateTimeParseException.class)
+    public void whenParseIncorrectValue_thenThrowAnException() {
+        // expected exception
+        customDateTimeFormatter.parse("qwerty", null);
+    }
+
+    @Test
+    public void whenPrintCorrectValue_thenReturnCorrectString() {
+        assertThat(customDateTimeFormatter.print(LocalDateTime.of(1996, 2, 7, 14, 12, 12), null)).isEqualTo("1996-02-07 14:12:12");
+    }
+}

src/test/java/com/github/prominence/carrepair/formatter/OrderStatusFormatterUnitTest.java

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+package com.github.prominence.carrepair.formatter;
+
+import com.github.prominence.carrepair.enums.OrderStatus;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
+
+@RunWith(SpringRunner.class)
+public class OrderStatusFormatterUnitTest {
+
+    private OrderStatusFormatter orderStatusFormatter = new OrderStatusFormatter();
+
+    @Test
+    public void whenParseNull_thenReturnNull() {
+        assertThat(orderStatusFormatter.parse(null, null)).isNull();
+    }
+
+    @Test
+    public void whenPrintNull_thenReturnNUll() {
+        assertThat(orderStatusFormatter.print(null, null)).isNull();
+    }
+
+    @Test
+    public void whenParseCorrectValue_thenReturnOrderStatus() {
+        assertThat(orderStatusFormatter.parse("Done", null)).isEqualTo(OrderStatus.DONE);
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void whenParseIncorrectValue_thenThrowAnException() {
+        // expected exception
+        orderStatusFormatter.parse("Incorrect", null);
+    }
+
+    @Test
+    public void whenPrintCorrectValue_thenReturnCorrectString() {
+        assertThat(orderStatusFormatter.print(OrderStatus.SCHEDULED, null)).isEqualTo("Scheduled");
+    }
+}