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net/netcheck: add addReportHistoryAndSetPreferredDERP() test case (#13989)

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Add an explicit case for exercising preferred DERP hysteresis around
the branch that compares latencies on a percentage basis.

Updates #cleanup

Signed-off-by: Jordan Whited <jordan@tailscale.com>
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Jordan Whited 2024-10-31 19:25:00 -07:00 committed by GitHub
parent 84c8860472
commit 49de23cf1b
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1 changed files with 9 additions and 0 deletions
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9
net/netcheck/netcheck_test.go
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@ -357,6 +357,15 @@ type step struct {
wantPrevLen: 3,
wantDERP: 2, // moved to d2 since d1 is gone
},
{
name: "preferred_derp_hysteresis_no_switch_pct",
steps: []step{
{0 * time.Second, report("d1", 34*time.Millisecond, "d2", 35*time.Millisecond)},
{1 * time.Second, report("d1", 34*time.Millisecond, "d2", 23*time.Millisecond)},
},
wantPrevLen: 2,
wantDERP: 1, // diff is 11ms, but d2 is greater than 2/3s of d1
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {