chore: import upstream snapshot with attribution

tests/python/relax/conftest.py

@@ -0,0 +1,85 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+
+import pytest
+
+import tvm
+from tvm.relax.ir.instrument import WellFormedInstrument
+
+
+@pytest.fixture
+def unit_test_marks(request):
+    """Get all marks applied to a test
+
+    From https://stackoverflow.com/a/61379477.
+    """
+    marks = [m.name for m in request.node.iter_markers()]
+    if request.node.parent:
+        marks += [m.name for m in request.node.parent.iter_markers()]
+    yield marks
+
+
+def pytest_configure(config):
+    config.addinivalue_line(
+        "markers",
+        (
+            "skip_well_formed_check_before_transform: "
+            "Suppress the default well-formed check before a IRModule transform"
+        ),
+    )
+    config.addinivalue_line(
+        "markers",
+        (
+            "skip_well_formed_check_after_transform: "
+            "Suppress the default well-formed check after a IRModule transform"
+        ),
+    )
+
+
+# By default, apply the well-formed check before and after all
+# transforms.  Checking well-formed-ness after the transform ensures
+# that all transforms produce well-formed output.  Checking
+# well-formed-ness before the transform ensures that test cases
+# (usually hand-written) are providing well-formed inputs.
+#
+# This is provided as a test fixture so that it can be overridden for
+# specific tests.  If a test must provide ill-formed input to a
+# transform, it can be marked with
+# `@pytest.mark.skip_well_formed_check_before_transform`
+@pytest.fixture(autouse=True)
+def apply_instrument_well_formed(unit_test_marks):
+    validate_before_transform = "skip_well_formed_check_before_transform" not in unit_test_marks
+    validate_after_transform = "skip_well_formed_check_after_transform" not in unit_test_marks
+
+    current = tvm.transform.PassContext.current()
+    instruments = list(current.instruments)
+
+    if validate_before_transform or validate_after_transform:
+        instruments.append(
+            WellFormedInstrument(validate_before_transform=validate_before_transform)
+        )
+
+    override = tvm.transform.PassContext(
+        # With the new WellFormedInstrument appended
+        instruments=instruments,
+        # Forward all other parameters
+        opt_level=current.opt_level,
+        required_pass=current.required_pass,
+        disabled_pass=current.disabled_pass,
+        config=current.config,
+    )
+    with override:
+        yield