Add test for Ray outputs (#9231)

python/ray/tests/BUILD

@@ -464,3 +464,11 @@ py_test(
     tags = ["exclusive", "manual"],
     deps = ["//:ray_lib"],
 )
+
+py_test(
+    name = "test_output",
+    size = "medium",
+    srcs = SRCS + ["test_output.py"],
+    tags = ["exclusive"],
+    deps = ["//:ray_lib"],
+)

python/ray/tests/test_output.py

@@ -0,0 +1,30 @@
+import re
+import subprocess
+import sys
+import pytest
+import ray
+
+
+def test_output():
+    outputs = subprocess.check_output(
+        [sys.executable, __file__, "_ray_instance"],
+        stderr=subprocess.STDOUT).decode()
+    lines = outputs.split("\n")
+    assert len(lines) == 3
+    logging_header = r"\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2},\d{3}\sINFO\s"
+    assert re.match(
+        logging_header + r"resource_spec.py:\d+ -- Starting Ray with [0-9\.]+ "
+        r"GiB memory available for workers and up to [0-9\.]+ GiB "
+        r"for objects. You can adjust these settings with .*?.", lines[0])
+    assert re.match(
+        logging_header +
+        r"services.py:\d+ -- View the Ray dashboard at .*?localhost:\d+?.*",
+        lines[1])
+
+
+if __name__ == "__main__":
+    if len(sys.argv) > 1 and sys.argv[1] == "_ray_instance":
+        ray.init()
+        ray.shutdown()
+    else:
+        sys.exit(pytest.main(["-v", __file__]))