RR User Interface Improvements, including Premium notices (#992)

* RR UX Improvements, including Premium notices

* Fixing Error handling bug in LoginDialog

src/test/java/io/github/dsheirer/service/radioreference/RadioReferenceTest.java

@@ -0,0 +1,54 @@
+package io.github.dsheirer.service.radioreference;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.text.SimpleDateFormat;
+import java.util.Calendar;
+import java.util.Date;
+
+import static io.github.dsheirer.service.radioreference.RadioReference.CheckExpDate;
+import static org.junit.Assert.*;
+
+public class RadioReferenceTest
+{
+
+    /**
+     * Tests the handling of Radio Reference's Premium Expiration date to Account Statuses
+     * Necessary because DateTime math gets easy to do incorrectly, and we don't want to
+     * lock a user out of access due to an off-by-one Date issue.
+     */
+    @Test
+    void checkExpDate()
+    {
+        SimpleDateFormat RRDateFormatter = new SimpleDateFormat("MM-dd-yyyy");
+        Date now = new Date();
+
+        Calendar c = Calendar.getInstance();
+        c.setTime(now);
+
+        // Never had premium (expired)
+        Assertions.assertEquals(RadioReference.LoginStatus.EXPIRED_PREMIUM, CheckExpDate("12-31-1969"));
+
+        // Expiring today (valid)
+        Assertions.assertEquals(RadioReference.LoginStatus.VALID_PREMIUM, CheckExpDate(RRDateFormatter.format(c.getTime())));
+
+        // Expiring next week (valid)
+        c.add(Calendar.DAY_OF_MONTH, 7);
+        Assertions.assertEquals(RadioReference.LoginStatus.VALID_PREMIUM, CheckExpDate(RRDateFormatter.format(c.getTime())));
+
+        // Expired yesterday (valid)
+        c.setTime(now);
+        c.add(Calendar.DAY_OF_MONTH, -1);
+        Assertions.assertEquals(RadioReference.LoginStatus.VALID_PREMIUM, CheckExpDate(RRDateFormatter.format(c.getTime())));
+
+        // Expired last week (expired)
+        c.setTime(now);
+        c.add(Calendar.DAY_OF_MONTH, -7);
+        Assertions.assertEquals(RadioReference.LoginStatus.EXPIRED_PREMIUM, CheckExpDate(RRDateFormatter.format(c.getTime())));
+
+        // Broadcastify user? Admin? Any string that's not a Date is considered valid (valid)
+        Assertions.assertEquals(RadioReference.LoginStatus.VALID_PREMIUM, CheckExpDate("Not a date"));
+
+    }
+}