# test_qwen.py

import unittest
from qwen_unified import QwenUnified # Assuming qwen_unified.py exists and contains the QwenUnified class

class TestQwenUnified(unittest.TestCase):

    def setUp(self):
        self.qwen = QwenUnified()

    def test_initialization(self):
        self.assertIsNotNone(self.qwen)

    def test_process_text_empty_input(self):
        result = self.qwen.process_text("")
        self.assertEqual(result, "", "Empty input should return empty output")

    def test_process_text_simple_input(self):
        result = self.qwen.process_text("Hello, world!")
        self.assertIsInstance(result, str, "Process text should return a string")
        self.assertNotEqual(result, "", "Process text should not return an empty string") #Assuming some processing occurs

    def test_process_text_with_numbers(self):
        result = self.qwen.process_text("12345")
        self.assertIsInstance(result, str)

    def test_process_text_with_special_characters(self):
        result = self.qwen.process_text("!@#$%^&*()")
        self.assertIsInstance(result, str)

    def test_process_text_long_input(self):
        long_text = "This is a very long string " * 100
        result = self.qwen.process_text(long_text)
        self.assertIsInstance(result, str)

    def test_train_model_valid_data(self):
        try:
            self.qwen.train_model([("input1", "output1"), ("input2", "output2")])
            self.assertTrue(True) #If it gets here, training did not raise an exception
        except Exception as e:
            self.fail(f"Training raised an exception: {e}")

    def test_train_model_empty_data(self):
        with self.assertRaises(ValueError):
            self.qwen.train_model([])

    def test_save_and_load_model(self):
        self.qwen.train_model([("input1", "output1")])
        self.qwen.save_model("test_model.pkl")
        loaded_qwen = QwenUnified()
        loaded_qwen.load_model("test_model.pkl")
        #Simple check to see if models are equivalent, assuming save/load functionality exists.
        self.assertIsNotNone(loaded_qwen.model)

    def tearDown(self):
        # Clean up any files created during testing
        import os
        if os.path.exists("test_model.pkl"):
            os.remove("test_model.pkl")

if __name__ == '__main__':
    unittest.main()