[Test] Move example test from unit test to examples (#5290)

* move example test from unit test to examples

* oops

* oops

* ok

tests/pytorch/sparse/test_example.py → tests/examples/test_sparse_examples.py

@@ -6,7 +6,6 @@ EXAMPLE_ROOT = os.path.join(
     os.path.dirname(os.path.relpath(__file__)),
     "..",
     "..",
-    "..",
     "examples",
     "sparse",
 )

tests/scripts/task_example_test.bat

@@ -22,6 +22,8 @@ SET DGL_LIBRARY_PATH=!CD!\build
 SET PYTHONPATH=!CD!\python;!PYTHONPATH!
 SET DGL_DOWNLOAD_DIR=!CD!
 
+python -m pytest -v --junitxml=pytest_backend.xml --durations=100 tests\examples || GOTO :FAIL
+
 PUSHD !GCN_EXAMPLE_DIR!
 python pagerank.py || GOTO :FAIL
 python gcn\train.py --dataset cora || GOTO :FAIL

tests/scripts/task_example_test.sh

@@ -36,6 +36,8 @@ export DGL_DOWNLOAD_DIR=${PWD}
 
 # test
 
+python3 -m pytest -v --junitxml=pytest_backend.xml --durations=100 tests/examples || fail "sparse examples on $1"
+
 pushd $GCN_EXAMPLE_DIR> /dev/null
 
 python3 pagerank.py || fail "run pagerank.py on $1"