- Use spawn in stead of fork so that any jvm will not exist in any child processes and block them from stopping.

- Use poetry for install.

tests/test_single.py

@@ -0,0 +1,11 @@
+import numpy as np
+from tiffwrite import IJTiffFile
+from itertools import product
+
+
+def test_single(tmp_path):
+    path = tmp_path / 'test.tif'
+    with IJTiffFile(path, (3, 4, 5)) as tif:
+        for c, z, t in product(range(3), range(4), range(5)):
+            tif.save(np.random.randint(0, 255, (64, 64)), c, z, t)
+    assert path.exists()