x/tools/gopls/internal/cmd: new test TestMCPVulncheckCommand fails on Plan 9

[millerresearch]

CL 702376 introduced a new test TestMCPVulncheckCommand which always fails on Plan 9, for example here:

--- FAIL: TestMCPVulncheckCommand (13.41s)
    mcp_test.go:340: calling "initialize": EOF
FAIL
FAIL	golang.org/x/tools/gopls/internal/cmd	491.900s

The error message "EOF" does not have a huge amount of diagnostic value, but the initialisation in this test follows the pattern of the other failing tests in mcp_test.go reported in issue #74580, and therefore I believe the test should be skipped on platforms where fsnotify is not supported.

[gabyhelp]

Related Issues

• x/tools/gopls/internal/cmd: TestMCP* tests fail on Plan 9 #74580 (closed)
• x/tools/gopls/internal/cmd: TestMCPVulncheckCommand failures [consistent failure] #75445 (closed)
• cmd/go: TestGoEnv failing on Plan 9 #18013 (closed)
• os/exec: TestLookPath fails on plan9 after CL 685755 #74892 (closed)

_{(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)}

[gopherbot]

Change https://go.dev/cl/706695 mentions this issue: gopls/internal/cmd: skip TestMCPVulncheckCommand when fsnotify not supported