feat: use postgres

integration/internal/harness/mailservice.go

@@ -0,0 +1,51 @@
+package harness
+
+import (
+	"context"
+	"testing"
+)
+
+// MailServicePersistence captures the per-test persistence dependencies of
+// the Mail Service binary: a PostgreSQL container hosting the `mail` schema
+// owned by the `mailservice` role, and the Redis credentials that point the
+// service at the caller-supplied master address.
+type MailServicePersistence struct {
+	// Postgres exposes the started container so tests that need direct SQL
+	// access to the mail schema (verifying side effects, seeding fixtures)
+	// can read or write through it.
+	Postgres *PostgresRuntime
+
+	// Env carries the environment entries that must be passed to the
+	// mail-service process. It is safe to merge into the caller's existing env
+	// map, or to use as-is and append further MAIL_* knobs in place.
+	Env map[string]string
+}
+
+// StartMailServicePersistence brings up one isolated PostgreSQL container,
+// provisions the `mail` schema with the `mailservice` role, and returns the
+// environment entries that wire the mail-service binary at that container plus
+// the supplied Redis master address.
+//
+// The returned password (`integration`) matches the architectural rule that
+// Redis traffic is password-protected; miniredis accepts arbitrary password
+// values when its own RequireAuth is not engaged, so the same value works
+// against both miniredis and the real `tcredis` runtime.
+//
+// Cleanup of the container is handled by the underlying StartPostgresContainer
+// through `t.Cleanup`; callers do not need to defer anything.
+func StartMailServicePersistence(t testing.TB, redisMasterAddr string) MailServicePersistence {
+	t.Helper()
+
+	rt := StartPostgresContainer(t)
+	if err := rt.EnsureRoleAndSchema(context.Background(), "mail", "mailservice", "mailservice"); err != nil {
+		t.Fatalf("ensure mail schema/role: %v", err)
+	}
+
+	env := WithPostgres(rt, "MAIL", "mail", "mailservice")
+	env["MAIL_REDIS_MASTER_ADDR"] = redisMasterAddr
+	env["MAIL_REDIS_PASSWORD"] = "integration"
+	return MailServicePersistence{
+		Postgres: rt,
+		Env:      env,
+	}
+}