card expiry validator

Author: mikelis135

raveandroid/src/main/java/com/flutterwave/raveandroid/validators/CardExpiryValidator.java

@@ -1,8 +1,10 @@
 package com.flutterwave.raveandroid.validators;
 
+import java.util.regex.Pattern;
+
 public class CardExpiryValidator {
 
     public boolean isCardExpiryValid(String cardExpiry){
-        return cardExpiry.length() == 5;
+        return Pattern.matches("\\d\\d/\\d\\d", cardExpiry);
     }
 }

raveandroid/src/test/java/com/flutterwave/raveandroid/validators/CardExpiryValidatorTest.java

@@ -0,0 +1,34 @@
+package com.flutterwave.raveandroid.validators;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.*;
+
+public class CardExpiryValidatorTest {
+
+    private CardExpiryValidator SUT;
+
+    @Before
+    public void setUp() throws Exception {
+        SUT = new CardExpiryValidator();
+    }
+
+    @Test
+    public void isValidCardExpiry_IsCorrectCardExpiryPassed_returnsTrue(){
+        String cardExpiry = "12/11";
+        boolean isCardExpiryValid = SUT.isCardExpiryValid(cardExpiry);
+        assertThat(true, is(isCardExpiryValid));
+    }
+
+    @Test
+    public void isValidCardExpiry_IsNumbersCardExpiryPassed_returnsTrue(){
+        String cardExpiry = "as/11";
+        boolean isCardExpiryValid = SUT.isCardExpiryValid(cardExpiry);
+        assertThat(false, is(isCardExpiryValid));
+    }
+
+
+
+}