diff --git a/tests/imputation/timemixer.py b/tests/imputation/timemixer.py
new file mode 100644
index 00000000..bf5c72cd
--- /dev/null
+++ b/tests/imputation/timemixer.py
@@ -0,0 +1,128 @@
+"""
+Test cases for TimeMixer imputation model.
+"""
+
+# Created by Wenjie Du <wenjay.du@gmail.com>
+# License: BSD-3-Clause
+
+
+import os.path
+import unittest
+
+import numpy as np
+import pytest
+
+from pypots.imputation import TimeMixer
+from pypots.optim import Adam
+from pypots.utils.logging import logger
+from pypots.utils.metrics import calc_mse
+from tests.global_test_config import (
+    DATA,
+    EPOCHS,
+    DEVICE,
+    TRAIN_SET,
+    VAL_SET,
+    TEST_SET,
+    GENERAL_H5_TRAIN_SET_PATH,
+    GENERAL_H5_VAL_SET_PATH,
+    GENERAL_H5_TEST_SET_PATH,
+    RESULT_SAVING_DIR_FOR_IMPUTATION,
+    check_tb_and_model_checkpoints_existence,
+)
+
+
+class TestTimeMixer(unittest.TestCase):
+    logger.info("Running tests for an imputation model TimeMixer...")
+
+    # set the log and model saving path
+    saving_path = os.path.join(RESULT_SAVING_DIR_FOR_IMPUTATION, "TimeMixer")
+    model_save_name = "saved_timemixer_model.pypots"
+
+    # initialize an Adam optimizer
+    optimizer = Adam(lr=0.001, weight_decay=1e-5)
+
+    # initialize a TimeMixer model
+    timemixer = TimeMixer(
+        DATA["n_steps"],
+        DATA["n_features"],
+        n_layers=2,
+        top_k=5,
+        d_model=512,
+        d_ffn=512,
+        dropout=0.1,
+        epochs=EPOCHS,
+        saving_path=saving_path,
+        optimizer=optimizer,
+        device=DEVICE,
+    )
+
+    @pytest.mark.xdist_group(name="imputation-timemixer")
+    def test_0_fit(self):
+        self.timemixer.fit(TRAIN_SET, VAL_SET)
+
+    @pytest.mark.xdist_group(name="imputation-timemixer")
+    def test_1_impute(self):
+        imputation_results = self.timemixer.predict(TEST_SET)
+        assert not np.isnan(
+            imputation_results["imputation"]
+        ).any(), "Output still has missing values after running impute()."
+
+        test_MSE = calc_mse(
+            imputation_results["imputation"],
+            DATA["test_X_ori"],
+            DATA["test_X_indicating_mask"],
+        )
+        logger.info(f"TimeMixer test_MSE: {test_MSE}")
+
+    @pytest.mark.xdist_group(name="imputation-timemixer")
+    def test_2_parameters(self):
+        assert hasattr(self.timemixer, "model") and self.timemixer.model is not None
+
+        assert (
+            hasattr(self.timemixer, "optimizer")
+            and self.timemixer.optimizer is not None
+        )
+
+        assert hasattr(self.timemixer, "best_loss")
+        self.assertNotEqual(self.timemixer.best_loss, float("inf"))
+
+        assert (
+            hasattr(self.timemixer, "best_model_dict")
+            and self.timemixer.best_model_dict is not None
+        )
+
+    @pytest.mark.xdist_group(name="imputation-timemixer")
+    def test_3_saving_path(self):
+        # whether the root saving dir exists, which should be created by save_log_into_tb_file
+        assert os.path.exists(
+            self.saving_path
+        ), f"file {self.saving_path} does not exist"
+
+        # check if the tensorboard file and model checkpoints exist
+        check_tb_and_model_checkpoints_existence(self.timemixer)
+
+        # save the trained model into file, and check if the path exists
+        saved_model_path = os.path.join(self.saving_path, self.model_save_name)
+        self.timemixer.save(saved_model_path)
+
+        # test loading the saved model, not necessary, but need to test
+        self.timemixer.load(saved_model_path)
+
+    @pytest.mark.xdist_group(name="imputation-timemixer")
+    def test_4_lazy_loading(self):
+        self.timemixer.fit(GENERAL_H5_TRAIN_SET_PATH, GENERAL_H5_VAL_SET_PATH)
+        imputation_results = self.timemixer.predict(GENERAL_H5_TEST_SET_PATH)
+        assert not np.isnan(
+            imputation_results["imputation"]
+        ).any(), "Output still has missing values after running impute()."
+
+        test_MSE = calc_mse(
+            imputation_results["imputation"],
+            DATA["test_X_ori"],
+            DATA["test_X_indicating_mask"],
+        )
+        logger.info(f"Lazy-loading TimeMixer test_MSE: {test_MSE}")
+
+
+if __name__ == "__main__":
+    unittest.main()