Add tests for NumPy language context and fix import path

thunder/numpy/__init__.py

@@ -1,7 +1,7 @@
 from numbers import Number
 from collections.abc import Callable
 
-from thunder.core.langctx import langctx, Languages
+from thunder.core.langctxs import langctx, Languages
 from thunder.numpy.langctx import register_method
 
 from thunder.core.proxies import TensorProxy

thunder/tests/test_numpy_langctx.py

@@ -0,0 +1,24 @@
+from thunder.numpy import size as np_size
+from thunder.core.langctxs import langctx, Languages, resolve_language
+from thunder.core.proxies import TensorProxy
+from thunder.core.trace import detached_trace
+from thunder.core.devices import cpu
+from thunder.core.dtypes import float32
+
+
+def test_numpy_langctx_registration_and_len_size():
+    with detached_trace():
+        t = TensorProxy(shape=(2, 3), device=cpu, dtype=float32)
+
+    with langctx(Languages.NUMPY):
+        assert len(t) == 2  # axis 0 length
+        assert t.size() == 6  # total elements
+        assert np_size(t) == 6
+
+
+def test_numpy_langctx_resolve_language():
+    numpy_ctx_by_enum = resolve_language(Languages.NUMPY)
+    numpy_ctx_by_name = resolve_language("numpy")
+
+    assert numpy_ctx_by_enum is numpy_ctx_by_name
+    assert numpy_ctx_by_enum.name == "numpy"