test: try to get new URI tests to pass on windows

Author: flavorjones

test/test_database_uri.rb

@@ -6,15 +6,19 @@ module SQLite3
   class TestDatabaseURI < SQLite3::TestCase
     def test_open_absolute_file_uri
       Tempfile.open "test.db" do |file|
-        assert SQLite3::Database.new("file:#{file.path}")
+        db = SQLite3::Database.new("file:#{file.path}")
+        assert db
+        db.close
       end
     end
 
     def test_open_relative_file_uri
       Dir.mktmpdir do |dir|
         Dir.chdir dir do
-          assert SQLite3::Database.new("file:test.db")
+          db = SQLite3::Database.new("file:test.db")
+          assert db
           assert_path_exists "test.db"
+          db.close
         end
       end
     end
@@ -26,6 +30,8 @@ def test_open_file_uri_readonly
         assert_raise(SQLite3::ReadOnlyException) do
           db.execute("CREATE TABLE foos (id integer)")
         end
+
+        db.close
       end
     end
   end