Running a test that outputs Observatory banner in non-debug mode connects to that URL #1449
Description
While running devtools tests (integration/logging) with the Run CodeLens link it was terminating early. Turned out that because we didn't get our own Observatory banner (since we ran without debugger) we were picking up the output from the tests (which spawn a process):
[10:20:11 GMT+0000 (GMT)] [PubTest] [Info] <== {"testID":4,"result":"success","skipped":false,"hidden":true,"type":"testDone","time":15431}
[10:20:11 GMT+0000 (GMT)] [PubTest] [Info] <== {"group":{"id":5,"suiteID":0,"parentID":3,"name":"integration logging","metadata":{"skip":false,"skipReason":null},"testCount":2,"line":32,"column":5,"url":"file:///Users/dantup/Dev/Google/devtools/packages/devtools/test/integration_tests/integration_test.dart"},"type":"group","time":15432}
[10:20:11 GMT+0000 (GMT)] [PubTest] [Info] <== {"test":{"id":6,"name":"integration logging displays log data","suiteID":0,"groupIDs":[2,3,5],"metadata":{"skip":false,"skipReason":null},"line":24,"column":3,"url":"file:///Users/dantup/Dev/Google/devtools/packages/devtools/test/integration_tests/logging.dart","root_line":32,"root_column":5,"root_url":"file:///Users/dantup/Dev/Google/devtools/packages/devtools/test/integration_tests/integration_test.dart"},"type":"testStart","time":15433}
[10:20:11 GMT+0000 (GMT)] [PubTest] [Info] <== {"testID":6,"messageType":"print","message":"PID = 16331","type":"print","time":15444}
[10:20:11 GMT+0000 (GMT)] [PubTest] [Info] <== {"testID":6,"messageType":"print","message":"16331: Got line: Observatory listening on http://127.0.0.1:52442/","type":"print","time":15521}
[10:20:11 GMT+0000 (GMT)] [Observatory] [Info] Observatory connection closed: 1006 ()
[10:20:11 GMT+0000 (GMT)] [PubTest] [Info] <== {"testID":6,"messageType":"print","message":"16331: Got line: starting logging app","type":"print","time":15783}
[10:20:12 GMT+0000 (GMT)] [Observatory] [Info] Disconnect requested!
[10:20:12 GMT+0000 (GMT)] [Observatory] [Info] TERM: Going to terminate with SIGINT...
[10:20:12 GMT+0000 (GMT)] [Observatory] [Info] TERM: Terminating related process 16285 with SIGINT...
[10:20:12 GMT+0000 (GMT)] [Observatory] [Info] TERM: Terminating main process with SIGINT...
[10:20:12 GMT+0000 (GMT)] [Observatory] [Info] TERM: Removing all stored data...
[10:20:12 GMT+0000 (GMT)] [Observatory] [Info] TERM: Waiting for process to finish...
We should be a bit more picky about what output we can read this from - we shouldn't be reading it from Pub Test JSON like this.