diff --git a/api/tests/convert/diffusion/test_textual_inversion.py b/api/tests/convert/diffusion/test_textual_inversion.py
new file mode 100644
index 00000000..246d53b4
--- /dev/null
+++ b/api/tests/convert/diffusion/test_textual_inversion.py
@@ -0,0 +1,227 @@
+import unittest
+
+import numpy as np
+import torch
+from onnx import GraphProto, ModelProto
+from onnx.numpy_helper import from_array, to_array
+
+from onnx_web.convert.diffusion.textual_inversion import (
+    blend_embedding_concept,
+    blend_embedding_embeddings,
+    blend_embedding_node,
+    blend_embedding_parameters,
+    blend_textual_inversions,
+    detect_embedding_format,
+)
+
+TEST_DIMS = (8, 8)
+TEST_DIMS_EMBEDS = (1, *TEST_DIMS)
+
+TEST_MODEL_EMBEDS = {
+      "string_to_token": {
+        "test": 1,
+      },
+      "string_to_param": {
+        "test": torch.from_numpy(np.ones(TEST_DIMS_EMBEDS)),
+      },
+}
+
+
+class DetectEmbeddingFormatTests(unittest.TestCase):
+  def test_concept(self):
+    embedding = {
+      "<test>": "test",
+    }
+    self.assertEqual(detect_embedding_format(embedding), "concept")
+
+  def test_parameters(self):
+    embedding = {
+      "emb_params": "test",
+    }
+    self.assertEqual(detect_embedding_format(embedding), "parameters")
+
+  def test_embeddings(self):
+    embedding = {
+      "string_to_token": "test",
+      "string_to_param": "test",
+    }
+    self.assertEqual(detect_embedding_format(embedding), "embeddings")
+
+  def test_unknown(self):
+    embedding = {
+      "what_is_this": "test",
+    }
+    self.assertEqual(detect_embedding_format(embedding), None)
+
+
+class BlendEmbeddingConceptTests(unittest.TestCase):
+  def test_existing_base_token(self):
+    embeds = {
+      "test": np.ones(TEST_DIMS),
+    }
+    blend_embedding_concept(embeds, {
+      "<test>": torch.from_numpy(np.ones(TEST_DIMS)),
+    }, np.float32, "test", 1.0)
+
+    self.assertIn("test", embeds)
+    self.assertEqual(embeds["test"].shape, TEST_DIMS)
+    self.assertEqual(embeds["test"].mean(), 2)
+
+  def test_missing_base_token(self):
+    embeds = {}
+    blend_embedding_concept(embeds, {
+      "<test>": torch.from_numpy(np.ones(TEST_DIMS)),
+    }, np.float32, "test", 1.0)
+
+    self.assertIn("test", embeds)
+    self.assertEqual(embeds["test"].shape, TEST_DIMS)
+
+  def test_existing_token(self):
+    embeds = {
+      "<test>": np.ones(TEST_DIMS),
+    }
+    blend_embedding_concept(embeds, {
+      "<test>": torch.from_numpy(np.ones(TEST_DIMS)),
+    }, np.float32, "test", 1.0)
+
+    keys = list(embeds.keys())
+    keys.sort()
+
+    self.assertIn("test", embeds)
+    self.assertEqual(keys, ["<test>", "test"])
+
+  def test_missing_token(self):
+    embeds = {}
+    blend_embedding_concept(embeds, {
+      "<test>": torch.from_numpy(np.ones(TEST_DIMS)),
+    }, np.float32, "test", 1.0)
+
+    keys = list(embeds.keys())
+    keys.sort()
+
+    self.assertIn("test", embeds)
+    self.assertEqual(keys, ["<test>", "test"])
+
+
+class BlendEmbeddingParametersTests(unittest.TestCase):
+  def test_existing_base_token(self):
+    embeds = {
+      "test": np.ones(TEST_DIMS),
+    }
+    blend_embedding_parameters(embeds, {
+      "emb_params": torch.from_numpy(np.ones(TEST_DIMS_EMBEDS)),
+    }, np.float32, "test", 1.0)
+
+    self.assertIn("test", embeds)
+    self.assertEqual(embeds["test"].shape, TEST_DIMS)
+    self.assertEqual(embeds["test"].mean(), 2)
+
+  def test_missing_base_token(self):
+    embeds = {}
+    blend_embedding_parameters(embeds, {
+      "emb_params": torch.from_numpy(np.ones(TEST_DIMS_EMBEDS)),
+    }, np.float32, "test", 1.0)
+
+    self.assertIn("test", embeds)
+    self.assertEqual(embeds["test"].shape, TEST_DIMS)
+
+  def test_existing_token(self):
+    embeds = {
+      "test": np.ones(TEST_DIMS_EMBEDS),
+    }
+    blend_embedding_parameters(embeds, {
+      "emb_params": torch.from_numpy(np.ones(TEST_DIMS_EMBEDS)),
+    }, np.float32, "test", 1.0)
+
+    keys = list(embeds.keys())
+    keys.sort()
+
+    self.assertIn("test", embeds)
+    self.assertEqual(keys, ["test", "test-0", "test-all"])
+
+  def test_missing_token(self):
+    embeds = {}
+    blend_embedding_parameters(embeds, {
+      "emb_params": torch.from_numpy(np.ones(TEST_DIMS_EMBEDS)),
+    }, np.float32, "test", 1.0)
+
+    keys = list(embeds.keys())
+    keys.sort()
+
+    self.assertIn("test", embeds)
+    self.assertEqual(keys, ["test", "test-0", "test-all"])
+
+
+class BlendEmbeddingEmbeddingsTests(unittest.TestCase):
+  def test_existing_base_token(self):
+    embeds = {
+      "test": np.ones(TEST_DIMS),
+    }
+    blend_embedding_embeddings(embeds, TEST_MODEL_EMBEDS, np.float32, "test", 1.0)
+
+    self.assertIn("test", embeds)
+    self.assertEqual(embeds["test"].shape, TEST_DIMS)
+    self.assertEqual(embeds["test"].mean(), 2)
+
+  def test_missing_base_token(self):
+    embeds = {}
+    blend_embedding_embeddings(embeds, TEST_MODEL_EMBEDS, np.float32, "test", 1.0)
+
+    self.assertIn("test", embeds)
+    self.assertEqual(embeds["test"].shape, TEST_DIMS)
+
+  def test_existing_token(self):
+    embeds = {
+      "test": np.ones(TEST_DIMS),
+    }
+    blend_embedding_embeddings(embeds, TEST_MODEL_EMBEDS, np.float32, "test", 1.0)
+
+    keys = list(embeds.keys())
+    keys.sort()
+
+    self.assertIn("test", embeds)
+    self.assertEqual(keys, ["test", "test-0", "test-all"])
+
+  def test_missing_token(self):
+    embeds = {}
+    blend_embedding_embeddings(embeds, TEST_MODEL_EMBEDS, np.float32, "test", 1.0)
+
+    keys = list(embeds.keys())
+    keys.sort()
+
+    self.assertIn("test", embeds)
+    self.assertEqual(keys, ["test", "test-0", "test-all"])
+
+
+class BlendEmbeddingNodeTests(unittest.TestCase):
+  def test_expand_weights(self):
+    weights = from_array(np.ones(TEST_DIMS))
+    weights.name = "text_model.embeddings.token_embedding.weight"
+
+    model = ModelProto(graph=GraphProto(initializer=[
+      weights,
+    ]))
+
+    embeds = {}
+    blend_embedding_node(model, {
+      'convert_tokens_to_ids': lambda t: t,
+    }, embeds, 2)
+
+    result = to_array(model.graph.initializer[0])
+
+    self.assertEqual(len(model.graph.initializer), 1)
+    self.assertEqual(result.shape, (10, 8)) # (8 + 2, 8)
+
+
+class BlendTextualInversionsTests(unittest.TestCase):
+  def test_blend_multi_concept(self):
+    pass
+
+  def test_blend_multi_parameters(self):
+    pass
+
+  def test_blend_multi_embeddings(self):
+    pass
+
+  def test_blend_multi_mixed(self):
+    pass
diff --git a/api/tests/image/test_utils.py b/api/tests/image/test_utils.py
new file mode 100644
index 00000000..f3b10fd5
--- /dev/null
+++ b/api/tests/image/test_utils.py
@@ -0,0 +1,24 @@
+import unittest
+
+from PIL import Image
+
+from onnx_web.image.utils import expand_image
+from onnx_web.params import Border
+
+
+class ExpandImageTests(unittest.TestCase):
+  def test_expand(self):
+    result = expand_image(
+      Image.new("RGB", (8, 8)),
+      Image.new("RGB", (8, 8), "white"),
+      Border.even(4),
+    )
+    self.assertEqual(result[0].size, (16, 16))
+
+  def test_masked(self):
+    result = expand_image(
+      Image.new("RGB", (8, 8), "red"),
+      Image.new("RGB", (8, 8), "white"),
+      Border.even(4),
+    )
+    self.assertEqual(result[0].getpixel((8, 8)), (255, 0, 0))
diff --git a/api/tests/worker/test_worker.py b/api/tests/worker/test_worker.py
new file mode 100644
index 00000000..06c0822d
--- /dev/null
+++ b/api/tests/worker/test_worker.py
@@ -0,0 +1,42 @@
+import unittest
+from multiprocessing import Queue, Value
+
+from onnx_web.server.context import ServerContext
+from onnx_web.worker.context import WorkerContext
+from onnx_web.worker.worker import EXIT_INTERRUPT, worker_main
+from tests.helpers import test_device
+
+
+class WorkerMainTests(unittest.TestCase):
+  def test_pending_exception_empty(self):
+    pass
+
+  def test_pending_exception_interrupt(self):
+    status = None
+
+    def exit(exit_status):
+      status = exit_status
+
+    cancel = Value("L", False)
+    logs = Queue()
+    pending = Queue()
+    progress = Queue()
+    pid = Value("L", False)
+    idle = Value("L", False)
+
+    pending.close()
+    # worker_main(WorkerContext("test", test_device(), cancel, logs, pending, progress, pid, idle, 0, 0.0), ServerContext(), exit=exit)
+
+    self.assertEqual(status, EXIT_INTERRUPT)
+
+  def test_pending_exception_retry(self):
+    pass
+
+  def test_pending_exception_value(self):
+    pass
+
+  def test_pending_exception_other_memory(self):
+    pass
+
+  def test_pending_exception_other_unknown(self):
+    pass