diff --git a/.vscode/settings.json b/.vscode/settings.json
index fbb6b85..5b8bd0b 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -17,7 +17,6 @@
   "files.autoSave": "afterDelay",
   "screencastMode.onlyKeyboardShortcuts": true,
   "terminal.integrated.fontSize": 18,
-  "workbench.activityBar.visible": true,
   "workbench.colorTheme": "Visual Studio Dark",
   "workbench.fontAliasing": "antialiased",
  "workbench.statusBar.visible": true,
diff --git a/src/main/java/DateChecker.java b/src/main/java/DateChecker.java
index 59c0e06..80eeae6 100644
--- a/src/main/java/DateChecker.java
+++ b/src/main/java/DateChecker.java
@@ -17,8 +17,18 @@ enum Month {
         DECEMBER
     }
 
+    private Month[] m31Days = {Month.JANUARY, Month.MARCH, Month.MAY, Month.JULY, Month.AUGUST, Month.OCTOBER, Month.DECEMBER};
+
+    public Month[] get31Days() {
+        return m31Days;
+    }
+
     public boolean has31Days(Month month) {
-        return false;
+        if(Arrays.asList(m31Days).contains(month)) {
+            return true;
+        } else {
+            return false;
+        }
     }
 
     
diff --git a/src/test/java/DateCheckerTest.java b/src/test/java/DateCheckerTest.java
index f4f5652..15864fc 100644
--- a/src/test/java/DateCheckerTest.java
+++ b/src/test/java/DateCheckerTest.java
@@ -1,17 +1,27 @@
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.EnumSource;
 
 import static org.junit.jupiter.api.Assertions.*;
 
+import java.time.Month;
+
 class DateCheckerTest {
 
+    DateChecker dateChecker = new DateChecker();
 
-    @Test
-    public void testHas31Days() {
+    @ParameterizedTest
+    @EnumSource(value = DateChecker.Month.class, names = { "JANUARY", "MARCH", "MAY", "JULY", "AUGUST", "OCTOBER",
+            "DECEMBER" })
+    public void testHas31Days(DateChecker.Month month) {
+        assertTrue(dateChecker.has31Days(month));
 
     }
 
-    @Test
-    public void testDoesNotHave31Days() {
+    @ParameterizedTest
+    @EnumSource(value = DateChecker.Month.class, names = { "FEBRUARY", "APRIL", "JUNE", "SEPTEMBER", "NOVEMBER" })
+    public void testDoesNotHave31Days(DateChecker.Month month) {
+        assertFalse(dateChecker.has31Days(month));
 
     }