Add tests

gentest.py

@@ -0,0 +1,12 @@
+import numpy as np
+
+def main():
+    for endianness in "<>":
+        for typ in "fiu":
+            for size in "48":
+                dtype=endianness + typ + size
+                arr = np.zeros((2,3,4), dtype=dtype)
+                np.save(f"test{dtype}.npy", arr)
+
+if __name__ == '__main__':
+    main()