Could not run tests with Observatory enabled. Try setting a different port with --port option.

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Issue

Could not run tests with Observatory enabled. Try setting a different port with --port option.

Error Log

Bad state: Could not run tests with Observatory enabled. Try setting a different port with --port option. #0 runTestsAndCollect (package:test_coverage/src/functions.dart:107:5) #1 main (file:///Users/QXZ12DI/project/test_coverage-0.4.1/bin/test_coverage.dart:51:9) #2 _startIsolate. (dart:isolate-patch/isolate_patch.dart:299:32) #3 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)

Details

QXZ12DI@LSCN886414 test_coverage-0.4.1 % flutter pub get
Running "flutter pub get" in test_coverage-0.4.1...                 2.0s
QXZ12DI@LSCN886414 test_coverage-0.4.1 % pub run test_coverage . false
Found 3 test files.
Generated test-all script in test/.test_coverage.dart. Please make sure it is added to .gitignore.
Unhandled exception:
Bad state: Could not run tests with Observatory enabled. Try setting a different port with --port option.
#0      runTestsAndCollect (package:test_coverage/src/functions.dart:107:5)
<asynchronous suspension>
#1      main (file:///Users/QXZ12DI/project/test_coverage-0.4.1/bin/test_coverage.dart:51:9)
#2      _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:299:32)
#3      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)
QXZ12DI@LSCN886414 test_coverage-0.4.1 % code .
QXZ12DI@LSCN886414 test_coverage-0.4.1 % dart --version
Dart SDK version: 2.10.3 (stable) (Tue Oct 27 14:44:30 2020 +0100) on "macos_x64"
QXZ12DI@LSCN886414 test_coverage-0.4.1 % flutter doctor --version
Flutter 1.22.3 • channel unknown • unknown source
Framework • revision 8874f21e79 (5 weeks ago) • 2020-10-29 14:14:35 -0700
Engine • revision a1440ca392
Tools • Dart 2.10.3
QXZ12DI@LSCN886414 test_coverage-0.4.1 %