cmd/testwrapper: move from corp; mark magicsock test as flaky

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: Ibab5860f5797b3db151d3c27855333e43a9088a4

cmd/testwrapper/flakytest/flakytest_test.go

@@ -0,0 +1,27 @@
+// Copyright (c) 2023 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package flakytest
+
+import "testing"
+
+func TestIssueFormat(t *testing.T) {
+	testCases := []struct {
+		issue string
+		want  bool
+	}{
+		{"https://github.com/tailscale/cOrp/issues/1234", true},
+		{"https://github.com/otherproject/corp/issues/1234", false},
+		{"https://github.com/tailscale/corp/issues/", false},
+	}
+	for _, testCase := range testCases {
+		if issueRegexp.MatchString(testCase.issue) != testCase.want {
+			ss := ""
+			if !testCase.want {
+				ss = " not"
+			}
+			t.Errorf("expected issueRegexp to%s match %q", ss, testCase.issue)
+		}
+	}
+}