Fix sqlite3 test (#32622)

tests/integration/api_issue_test.go

@@ -144,6 +144,18 @@ func TestAPICreateIssue(t *testing.T) {
 
 func TestAPICreateIssueParallel(t *testing.T) {
 	defer tests.PrepareTestEnv(t)()
+
+	// FIXME: There seems to be a bug in github.com/mattn/go-sqlite3 with sqlite_unlock_notify, when doing concurrent writes to the same database,
+	// some requests may get stuck in "go-sqlite3.(*SQLiteRows).Next", "go-sqlite3.(*SQLiteStmt).exec" and "go-sqlite3.unlock_notify_wait",
+	// because the "unlock_notify_wait" never returns and the internal lock never gets releases.
+	//
+	// The trigger is: a previous test created issues and made the real issue indexer queue start processing, then this test does concurrent writing.
+	// Adding this "Sleep" makes go-sqlite3 "finish" some internal operations before concurrent writes and then won't get stuck.
+	// To reproduce: make a new test run these 2 tests enough times:
+	// > func TestBug() { for i := 0; i < 100; i++ { testAPICreateIssue(t); testAPICreateIssueParallel(t) } }
+	// Usually the test gets stuck in fewer than 10 iterations without this "sleep".
+	time.Sleep(time.Second)
+
 	const body, title = "apiTestBody", "apiTestTitle"
 
 	repoBefore := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})