Move serve and asyncio tests to bazel (#6979)

python/ray/experimental/serve/BUILD

@@ -0,0 +1,28 @@
+# This is a dummy test dependency that causes the above tests to be
+# re-run if any of these files changes.
+py_library(
+    name = "serve_lib",
+    srcs = glob(["**/*.py"], exclude=["tests/*.py"]),
+)
+
+# This test aggregates all serve tests and run them in a single session
+# similar to `pytest .`
+# Serve tests need to run in a single session because starting and stopping
+# serve cluster take a large chunk of time. All serve tests use a shared
+# cluster.
+py_test(
+    name = "test_serve",
+    size = "medium",
+    srcs = glob(["tests/*.py"]),
+    tags = ["exclusive"],
+    deps = [":serve_lib"],
+)
+
+# Make sure the example showing in doc is tested
+py_test(
+    name = "echo_full",
+    size = "small",
+    srcs = glob(["examples/*.py"]),
+    tags = ["exclusive"],
+    deps = [":serve_lib"]
+)

python/ray/experimental/serve/tests/test_serve.py

@@ -0,0 +1,15 @@
+import pytest
+from pathlib import Path
+import sys
+
+if __name__ == "__main__":
+    curr_dir = Path(__file__).parent
+    test_paths = curr_dir.rglob("test_*.py")
+    sorted_path = sorted(map(lambda path: str(path.absolute()), test_paths))
+    serve_tests_files = list(sorted_path)
+
+    print("Testing the following files")
+    for test_file in serve_tests_files:
+        print("->", test_file.split("/")[-1])
+
+    sys.exit(pytest.main(["-v", "-s"] + serve_tests_files))