Simplified the import hook tests

test/import_hook_tester.py

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+# Copyright (c) 2022 Google LLC
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy of
+# this software and associated documentation files (the "Software"), to deal in
+# the Software without restriction, including without limitation the rights to
+# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+# the Software, and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+import dataclasses
+
+import equinox as eqx
+import jax.numpy as jnp
+import pytest
+from helpers import ParamError, ReturnError
+
+import jaxtyping
+from jaxtyping import Float32
+
+
+# Test that functions get checked
+
+
+def g(x: Float32[jnp.ndarray, " b"]):
+    pass
+
+
+g(jnp.array([1.0]))
+with pytest.raises(ParamError):
+    g(jnp.array(1))
+
+# Test that Equinox modules get checked
+
+
+class M(eqx.Module):
+    foo: int
+    bar: Float32[jnp.ndarray, " a"]
+
+
+M(1, jnp.array([1.0]))
+with pytest.raises(ParamError):
+    M(1.0, jnp.array([1.0]))
+with pytest.raises(ParamError):
+    M(1, jnp.array(1.0))
+
+# Test that dataclasses get checked
+
+
+@dataclasses.dataclass
+class D:
+    foo: int
+    bar: Float32[jnp.ndarray, " a"]
+
+
+D(1, jnp.array([1.0]))
+with pytest.raises(ParamError):
+    D(1.0, jnp.array([1.0]))
+with pytest.raises(ParamError):
+    D(1, jnp.array(1.0))
+
+# Test that methods get checked
+
+
+class N(eqx.Module):
+    a: jnp.ndarray
+
+    def __init__(self, foo: str):
+        self.a = jnp.array(1)
+
+    def foo(self, x: jnp.ndarray):
+        pass
+
+    def bar(self) -> jnp.ndarray:
+        return self.a
+
+
+n = N("hi")
+with pytest.raises(ParamError):
+    N(123)
+with pytest.raises(ParamError):
+    n.foo("not_an_array_either")
+bad_n = eqx.tree_at(lambda x: x.a, n, "not_an_array")
+with pytest.raises(ReturnError):
+    bad_n.bar()
+
+# Test that converters work
+
+
+class BadConverter(eqx.Module):
+    a: jnp.ndarray = eqx.field(converter=lambda x: x)
+
+
+with pytest.raises(ParamError):
+    BadConverter(1)
+with pytest.raises(ParamError):
+    BadConverter("asdf")
+
+# Record that we've finished our checks successfully
+
+jaxtyping._test_import_hook_counter += 1