diff --git a/src/test/java/com/github/wahyd4/creditcard/service/FraudCheckerTest.java b/src/test/java/com/github/wahyd4/creditcard/service/FraudCheckerTest.java
index c00f3ec..60e7a42 100644
--- a/src/test/java/com/github/wahyd4/creditcard/service/FraudCheckerTest.java
+++ b/src/test/java/com/github/wahyd4/creditcard/service/FraudCheckerTest.java
@@ -33,6 +33,31 @@ public class FraudCheckerTest {
         assertEquals(Arrays.asList("10d7ce2f43e35fa57d1bbf8b1e2"), strings);
     }
 
+    @Test
+    public void shouldReturnFraudulentCreditCardWhenThereIsOnlyOneEntryButOverTheThreshold() {
+        FraudChecker fraudChecker = new FraudChecker(parser);
+        List<String> entries = Arrays.asList(
+                "10d7ce2f43e35fa57d1bbf8b1e2, 2014-04-29T16:15:54, 80.00"
+        );
+        BigDecimal threshold = BigDecimal.valueOf(40.00);
+        List<String> strings = fraudChecker.fraudulentCreditCards(entries, threshold);
+        assertEquals(Arrays.asList("10d7ce2f43e35fa57d1bbf8b1e2"), strings);
+    }
+
+    @Test
+    public void shouldReturnFraudulentCreditCardWhenMultipleSlidingTimeRangesOverTheThreshold() {
+        FraudChecker fraudChecker = new FraudChecker(parser);
+        List<String> entries = Arrays.asList(
+                "10d7ce2f43e35fa57d1bbf8b1e2, 2014-04-29T10:15:54, 20.00",
+                "10d7ce2f43e35fa57d1bbf8b1e2, 2014-04-29T20:15:54, 30.00",
+                "10d7ce2f43e35fa57d1bbf8b1e2, 2015-01-20T16:15:54, 10.00",
+                "10d7ce2f43e35fa57d1bbf8b1e2, 2015-01-20T19:15:54, 35.00"
+        );
+        BigDecimal threshold = BigDecimal.valueOf(40.00);
+        List<String> strings = fraudChecker.fraudulentCreditCards(entries, threshold);
+        assertEquals(Arrays.asList("10d7ce2f43e35fa57d1bbf8b1e2"), strings);
+    }
+
     @Test
     public void shouldIgnoreTheCardWhenTheTotalIsEqualToTheThreshold() {
         FraudChecker fraudChecker = new FraudChecker(parser);