Add unit test for getFirewallType

Add the test to increase code line coverage.

Bug: N/A
Test: atest
Change-Id: Ic469da984dd5879acb229d1a147a670b1787e996

service/native/TrafficControllerTest.cpp

@@ -718,6 +718,31 @@ TEST_F(TrafficControllerTest, TestDumpsys) {
     EXPECT_TRUE(expectDumpsysContains(expectedLines));
 }
 
+TEST_F(TrafficControllerTest, getFirewallType) {
+    static const struct TestConfig {
+        ChildChain childChain;
+        FirewallType firewallType;
+    } testConfigs[] = {
+            // clang-format off
+            {NONE, DENYLIST},
+            {DOZABLE, ALLOWLIST},
+            {STANDBY, DENYLIST},
+            {POWERSAVE, ALLOWLIST},
+            {RESTRICTED, ALLOWLIST},
+            {LOW_POWER_STANDBY, ALLOWLIST},
+            {LOCKDOWN, DENYLIST},
+            {OEM_DENY_1, DENYLIST},
+            {OEM_DENY_2, DENYLIST},
+            {INVALID_CHAIN, DENYLIST},
+            // clang-format on
+    };
+
+    for (const auto& config : testConfigs) {
+        SCOPED_TRACE(fmt::format("testConfig: [{}, {}]", config.childChain, config.firewallType));
+        EXPECT_EQ(config.firewallType, mTc.getFirewallType(config.childChain));
+    }
+}
+
 constexpr uint32_t SOCK_CLOSE_WAIT_US = 30 * 1000;
 constexpr uint32_t ENOBUFS_POLL_WAIT_US = 10 * 1000;