Fix test with Python 3.10 (#108)

Author: jspricke

test/plugins/test_pyflakes_lint.py

@@ -1,6 +1,8 @@
 # Copyright 2017-2020 Palantir Technologies, Inc.
 # Copyright 2021- Python Language Server Contributors.
 
+import sys
+
 from pylsp import lsp, uris
 from pylsp.workspace import Document
 from pylsp.plugins import pyflakes_lint
@@ -42,7 +44,10 @@ def test_syntax_error_pyflakes(workspace):
     doc = Document(DOC_URI, workspace, DOC_SYNTAX_ERR)
     diag = pyflakes_lint.pylsp_lint(doc)[0]
 
-    assert diag['message'] == 'invalid syntax'
+    if sys.version_info[:2] >= (3, 10):
+        assert diag['message'] == "expected ':'"
+    else:
+        assert diag['message'] == 'invalid syntax'
     assert diag['range']['start'] == {'line': 0, 'character': 12}
     assert diag['severity'] == lsp.DiagnosticSeverity.Error