expectedFields: map[string]struct{}{
				`connection_string="host=localhost port=2832"`: {},
				`comment="really long comment"`:                {},
			},
		},
		// Incorrect delimiter, expected fields should be empty.
		{
			input:          `comment:"really long comment" connection_string:"host=localhost port=2832"`,
			keys:           []string{"connection_string", "comment"},
			expectedFields: map[string]struct{}{},
		},

	testCases := []struct {
		data      []byte
		expectErr bool
	}{
		{dataCase1, false},
		{dataCase2, false},
		{dataCase3, false},
		{dataCase4, true},
		// make sure we don't fail when queue is empty.
		{dataCase5, false},
	}

	for i, testCase := range testCases {
		err := xml.Unmarshal(testCase.data, &Config{})
		expectErr := (err != nil)

		if expectErr != testCase.expectErr {