1  # SPDX-FileCopyrightText: 2022-present deepset GmbH <info@deepset.ai>
 2  #
 3  # SPDX-License-Identifier: Apache-2.0
 4  
 5  from haystack.components.joiners.string_joiner import StringJoiner
 6  from haystack.core.serialization import component_from_dict, component_to_dict
 7  
 8  
 9  class TestStringJoiner:
10      def test_init(self):
11          joiner = StringJoiner()
12          assert isinstance(joiner, StringJoiner)
13  
14      def test_to_dict(self):
15          joiner = StringJoiner()
16          data = component_to_dict(joiner, name="string_joiner")
17          assert data == {"type": "haystack.components.joiners.string_joiner.StringJoiner", "init_parameters": {}}
18  
19      def test_from_dict(self):
20          data = {"type": "haystack.components.joiners.string_joiner.StringJoiner", "init_parameters": {}}
21          string_joiner = component_from_dict(StringJoiner, data=data, name="string_joiner")
22          assert isinstance(string_joiner, StringJoiner)
23  
24      def test_empty_list(self):
25          joiner = StringJoiner()
26          result = joiner.run([])
27          assert result == {"strings": []}
28  
29      def test_single_string(self):
30          joiner = StringJoiner()
31          result = joiner.run("a")
32          assert result == {"strings": ["a"]}
33  
34      def test_two_strings(self):
35          joiner = StringJoiner()
36          result = joiner.run(["a", "b"])
37          assert result == {"strings": ["a", "b"]}