Function assertProjectUnchanged

backend/tests/collision_helper_test.go:643–690

assertProjectUnchanged fails if any row in the `before` snapshot went missing or got mutated in `after`. Keyed by resource name (unique per project by construction) so comparison is order-insensitive. Issue.UpdateTime is deliberately NOT compared — the approval runner actively updates open issues i

(
	t *testing.T,
	before, after *projectSnapshot,
	label string,
)

// behavior, not a cross-project leak. Title and Status are the fields a
// cross-project corruption would mutate.
func assertProjectUnchanged(
	t *testing.T,
	before, after *projectSnapshot,
	label string,
) {
	t.Helper()
	a := require.New(t)

	assertNoChange(t, before.Plans, after.Plans,
		func(p *v1pb.Plan) string { return p.Name },
		func(b, af *v1pb.Plan) {
			a.True(proto.Equal(b.UpdateTime, af.UpdateTime), "%s: plan %s update_time changed", label, b.Name)
		},
		label, "plan")

	assertNoChange(t, before.Issues, after.Issues,
		func(i *v1pb.Issue) string { return i.Name },
		func(b, af *v1pb.Issue) {
			a.Equal(b.Title, af.Title, "%s: issue %s title changed", label, b.Name)
			a.Equal(b.Status, af.Status, "%s: issue %s status changed", label, b.Name)
		},
		label, "issue")

	assertNoChange(t, before.TaskRuns, after.TaskRuns,
		func(tr *v1pb.TaskRun) string { return tr.Name },
		func(b, af *v1pb.TaskRun) {
			a.Equal(b.Status, af.Status, "%s: task_run %s status changed from %v to %v", label, b.Name, b.Status, af.Status)
			a.True(proto.Equal(b.UpdateTime, af.UpdateTime), "%s: task_run %s update_time changed", label, b.Name)
		},
		label, "task_run")

	assertNoChange(t, before.PlanCheckRuns, after.PlanCheckRuns,
		func(p *v1pb.PlanCheckRun) string { return p.Name },
		func(b, af *v1pb.PlanCheckRun) {
			a.Equal(b.Status, af.Status, "%s: plan_check_run %s status changed from %v to %v", label, b.Name, b.Status, af.Status)
		},
		label, "plan_check_run")

	// issue_comment is keyed by composite (project, id); a cross-project
	// emission would surface here as either a new row in `after` or a
	// disappeared row.
	assertNoChange(t, before.IssueComments, after.IssueComments,
		func(c *v1pb.IssueComment) string { return c.Name },
		func(b, af *v1pb.IssueComment) {
			a.Equal(b.Comment, af.Comment, "%s: issue_comment %s comment changed", label, b.Name)
		},
		label, "issue_comment")
}

// assertNoChange compares two row slices keyed by name, fails if any
// row disappeared, appeared, or duplicated. Per-row equality beyond