diff --git a/api/tests/test_diffusers/test_utils.py b/api/tests/test_diffusers/test_utils.py
index 5377f24c..b3f8d8ce 100644
--- a/api/tests/test_diffusers/test_utils.py
+++ b/api/tests/test_diffusers/test_utils.py
@@ -9,7 +9,10 @@ from onnx_web.diffusers.utils import (
     get_latents_from_seed,
     get_loras_from_prompt,
     get_scaled_latents,
+    get_tile_latents,
     get_tokens_from_prompt,
+    pop_random,
+    slice_prompt,
 )
 from onnx_web.params import Size
 
@@ -64,10 +67,19 @@ class TestLatentsFromSeed(unittest.TestCase):
 
 class TestTileLatents(unittest.TestCase):
   def test_full_tile(self):
-    pass
+    partial = np.zeros((1, 1, 64, 64))
+    full = get_tile_latents(partial, 1, (64, 64), (0, 0, 64))
+    self.assertEqual(full.shape, (1, 1, 8, 8))
 
-  def test_partial_tile(self):
-    pass
+  def test_contract_tile(self):
+    partial = np.zeros((1, 1, 64, 64))
+    full = get_tile_latents(partial, 1, (32, 32), (0, 0, 32))
+    self.assertEqual(full.shape, (1, 1, 4, 4))
+
+  def test_expand_tile(self):
+    partial = np.zeros((1, 1, 32, 32))
+    full = get_tile_latents(partial, 1, (64, 64), (0, 0, 64))
+    self.assertEqual(full.shape, (1, 1, 8, 8))
 
 class TestScaledLatents(unittest.TestCase):
   def test_scale_up(self):
@@ -84,3 +96,32 @@ class TestScaledLatents(unittest.TestCase):
       latents[0, 0, 1, 0] +
       latents[0, 0, 1, 1]
     ) / 4, scaled[0, 0, 0, 0])
+
+class TestReplaceWildcards(unittest.TestCase):
+  pass
+
+class TestPopRandom(unittest.TestCase):
+  def test_pop(self):
+    items = ["1", "2", "3"]
+    pop_random(items)
+    self.assertEqual(len(items), 2)
+
+class TestRepairNaN(unittest.TestCase):
+  def test_unchanged(self):
+    pass
+
+  def test_missing(self):
+    pass
+
+class TestSlicePrompt(unittest.TestCase):
+  def test_slice_no_delimiter(self):
+    slice = slice_prompt("foo", 1)
+    self.assertEqual(slice, "foo")
+
+  def test_slice_within_range(self):
+    slice = slice_prompt("foo || bar", 1)
+    self.assertEqual(slice, " bar")
+
+  def test_slice_outside_range(self):
+    slice = slice_prompt("foo || bar", 9)
+    self.assertEqual(slice, " bar")
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