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tessera-npy: add data access tests
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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tessera-npy/test/test_npy.ml
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tessera-npy/test/test_npy.ml
···
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| Ok _ -> Alcotest.fail "should have failed"
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| Error _ -> ()
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let test_int8_data () =
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let data = String.init 6 (fun i ->
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Char.chr ([| 1; 255; 127; 128; 0; 42 |].(i))
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) in
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let npy = make_npy_v1 ~descr:"|i1" ~fortran_order:false ~shape:[2; 3] data in
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match Npy.of_string npy with
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| Error e -> Alcotest.fail e
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| Ok t ->
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(match Npy.data_int8 t with
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| None -> Alcotest.fail "expected Some for data_int8"
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| Some ba ->
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Alcotest.(check int) "elem 0" 1 (Bigarray.Array1.get ba 0);
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Alcotest.(check int) "elem 1" (-1) (Bigarray.Array1.get ba 1);
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Alcotest.(check int) "elem 2" 127 (Bigarray.Array1.get ba 2);
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Alcotest.(check int) "elem 3" (-128) (Bigarray.Array1.get ba 3);
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Alcotest.(check int) "elem 4" 0 (Bigarray.Array1.get ba 4);
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Alcotest.(check int) "elem 5" 42 (Bigarray.Array1.get ba 5))
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let test_float32_data () =
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let bits = Int32.bits_of_float 3.14 in
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let data = String.init 4 (fun i ->
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Char.chr (Int32.to_int (Int32.logand (Int32.shift_right_logical bits (i * 8)) 0xffl))
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) in
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let npy = make_npy_v1 ~descr:"<f4" ~fortran_order:false ~shape:[1] data in
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match Npy.of_string npy with
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| Error e -> Alcotest.fail e
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| Ok t ->
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(match Npy.data_float32 t with
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| None -> Alcotest.fail "expected Some for data_float32"
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| Some ba ->
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let v = Bigarray.Array1.get ba 0 in
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if Float.abs (v -. 3.14) > 0.001 then
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Alcotest.failf "expected ~3.14, got %f" v)
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let test_wrong_dtype_returns_none () =
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let data = String.init 6 (fun i ->
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Char.chr ([| 1; 255; 127; 128; 0; 42 |].(i))
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) in
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let npy = make_npy_v1 ~descr:"|i1" ~fortran_order:false ~shape:[2; 3] data in
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match Npy.of_string npy with
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| Error e -> Alcotest.fail e
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| Ok t ->
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Alcotest.(check bool) "data_float32 is None" true (Option.is_none (Npy.data_float32 t));
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Alcotest.(check bool) "data_int8 is Some" true (Option.is_some (Npy.data_int8 t))
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let () =
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Alcotest.run "tessera-npy"
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[
···
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Alcotest.test_case "float32 header" `Quick test_parse_float32_header;
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Alcotest.test_case "3d shape" `Quick test_parse_3d_shape;
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Alcotest.test_case "bad magic" `Quick test_bad_magic;
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] );
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( "data",
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[
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Alcotest.test_case "int8 data" `Quick test_int8_data;
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Alcotest.test_case "float32 data" `Quick test_float32_data;
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Alcotest.test_case "wrong dtype returns none" `Quick test_wrong_dtype_returns_none;
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] );
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]