Add exception tests

test/dart_kollection_test.dart

@@ -9,10 +9,12 @@ import 'collection/map_mutable_extensions_test.dart' as map_mutable_extensions_t
 import 'collection/map_test.dart' as map_test;
 import 'collection/set_test.dart' as set_test;
 import 'collections_test.dart' as collections_test;
+import 'exceptions_test.dart' as exceptions_test;
 import 'tuples_test.dart' as tuples_test;
 
 main() {
   collections_test.main();
+  exceptions_test.main();
   tuples_test.main();
   iterable_extensions_test.main();
   list_mutable_extensions_test.main();

test/exceptions_test.dart

@@ -0,0 +1,28 @@
+import 'package:dart_kollection/dart_kollection.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group("IndexOutOfBoundsException", () {
+    test("toString with message", () {
+      final e = IndexOutOfBoundsException("orange juice");
+      expect(e.toString(), "IndexOutOfBoundsException: orange juice");
+    });
+
+    test("toString without message", () {
+      final e = IndexOutOfBoundsException();
+      expect(e.toString(), "IndexOutOfBoundsException");
+    });
+  });
+
+  group("NoSuchElementException", () {
+    test("toString with message", () {
+      final e = NoSuchElementException("orange juice");
+      expect(e.toString(), "NoSuchElementException: orange juice");
+    });
+
+    test("toString without message", () {
+      final e = NoSuchElementException();
+      expect(e.toString(), "NoSuchElementException");
+    });
+  });
+}