Add generic error handling for API Football

src/test/java/de/jeyp91/apifootball/APIFootballUpdaterTest.java

@@ -4,6 +4,18 @@ import org.junit.Test;
 
 public class APIFootballUpdaterTest {
 
+    @Test
+    public void checkErrorsTest() {
+        String exceededLimitDayError = "{\"api\":{\"results\":0,\"error\":\"You have reached the request limit for the day\"}}";
+        APIFootballUpdater updater = new APIFootballUpdater();
+        try {
+            updater.checkErrors("https://test.url/api", exceededLimitDayError);
+        } catch (Exception e) {
+            System.out.println(e.getMessage());
+            assert e.getMessage().equals("https://test.url/api returned error: 'You have reached the request limit for the day'");
+        }
+    }
+
     @Test
     public void updateFixturesTest() throws Exception {
         APIFootballUpdater updater = new APIFootballUpdater();