From 81446c51d4d14dce8ec4bf241513f91f10b6c46e Mon Sep 17 00:00:00 2001
From: jsmarr <jsmarr@gmail.com>
Date: Wed, 12 May 2021 14:58:20 -0700
Subject: [PATCH 1/3] Throw if timezone database isn't initialized

---
 lib/src/location_database.dart | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/src/location_database.dart b/lib/src/location_database.dart
index 812564e..d3c0151 100644
--- a/lib/src/location_database.dart
+++ b/lib/src/location_database.dart
@@ -28,6 +28,13 @@ class LocationDatabase {
 
   /// Finds [Location] by its name.
   Location get(String name) {
+    if (!isInitialized) {
+      // Before you can get a location, you need to manually initialize the
+      // timezone location database by calling initializeDatabase or similar.
+      throw LocationNotFoundException(
+          'Tried to get location before initializing timezone database');
+    }
+
     final loc = _locations[name];
     if (loc == null) {
       throw LocationNotFoundException(

From e9299795ccd0309d5df71630ea2c8295102dfe6b Mon Sep 17 00:00:00 2001
From: jsmarr <jsmarr@gmail.com>
Date: Wed, 12 May 2021 14:59:21 -0700
Subject: [PATCH 2/3] Test for initialization exception

---
 test/datetime_test_no_database.dart | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/test/datetime_test_no_database.dart b/test/datetime_test_no_database.dart
index a2bb837..4323083 100644
--- a/test/datetime_test_no_database.dart
+++ b/test/datetime_test_no_database.dart
@@ -1,11 +1,21 @@
 @TestOn('vm')
 import 'package:test/test.dart';
 import 'package:timezone/standalone.dart';
+import 'package:timezone/timezone.dart';
 
 void main() {
   group('Without initializing timezone database', () {
     test('Can still construct TZDateTime.utc', () {
       TZDateTime.utc(2019);
     });
+
+    test(
+        'getLocation throws $LocationNotFoundException with message about the database not being initialized',
+        () {
+      expect(
+          () => getLocation('America/New_York'),
+          throwsA(TypeMatcher<LocationNotFoundException>()
+              .having((e) => e.msg, 'msg', contains('database'))));
+    });
   });
 }

From e3363e9d1afa7c5f5d18c66bedb1a7d2905a5db0 Mon Sep 17 00:00:00 2001
From: jsmarr <jsmarr@gmail.com>
Date: Wed, 12 May 2021 15:00:31 -0700
Subject: [PATCH 3/3] Test for unrecognized timezone

---
 test/datetime_test.dart | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/test/datetime_test.dart b/test/datetime_test.dart
index 032b29d..d705282 100644
--- a/test/datetime_test.dart
+++ b/test/datetime_test.dart
@@ -154,5 +154,14 @@ Future<void> main() async {
         });
       });
     });
+  });  
+  
+  group('Timezones', () {
+    test(
+        'getLocation throws $LocationNotFoundException for unrecognized timezone',
+        () {
+      expect(() => getLocation('non-existent-location'),
+          throwsA(TypeMatcher<LocationNotFoundException>()));
+    });
   });
 }