diff --git a/gentest.py b/gentest.py
new file mode 100644
index 0000000..118fae8
--- /dev/null
+++ b/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()
diff --git a/tests.bqn b/tests.bqn
index d50906b..d5c953c 100644
--- a/tests.bqn
+++ b/tests.bqn
@@ -1,11 +1,5 @@
 ⟨SaveNpy,LoadNpy⟩←•Import"npy.bqn"
 
-a←3‿4‿5•rand.Range 0
-"testbqn.npy"SaveNpy a
-b←LoadNpy"testbqn.npy"
-! a≡○≢b
-! a≡b
-
 floatArr←2‿3•rand.Range 0
 intArr←50-˜2‿3•rand.Range 100
 uintArr←2‿3•rand.Range 100
@@ -14,6 +8,23 @@ uintArr←2‿3•rand.Range 100
 "test_int.npy"SaveNpy intArr
 "test_uint.npy"SaveNpy uintArr
 
-floatArr≡LoadNpy"test_float.npy"
-intArr≡LoadNpy"test_int.npy"
-uintArr≡LoadNpy"test_uint.npy"
+! floatArr≡LoadNpy"test_float.npy"
+! intArr≡LoadNpy"test_int.npy"
+! uintArr≡LoadNpy"test_uint.npy"
+
+# Supported dtypes
+ref←2‿3‿4⥊0
+! ref≡LoadNpy"test<f8.npy"
+! ref≡LoadNpy"test<i4.npy"
+! ref≡LoadNpy"test<u4.npy"
+# Unsupported dtypes, should raise an error
+! LoadNpy⎊1"test<f4.npy"
+! LoadNpy⎊1"test<i8.npy"
+! LoadNpy⎊1"test<u8.npy"
+! LoadNpy⎊1"test>f4.npy"
+! LoadNpy⎊1"test>f8.npy"
+! LoadNpy⎊1"test>i4.npy"
+! LoadNpy⎊1"test>i8.npy"
+! LoadNpy⎊1"test>u4.npy"
+! LoadNpy⎊1"test>u8.npy"
+