Fix a regression in how required properties are collected.

+ Enable app standby mode before running the tests.

Fixes: 147459100
Fixes: 117169751
Test: atest hostsidetests/net/src/com/android/cts/net/HostsideRestrictBackgroundNetworkTests.java
Test: cts-tradefed run singleCommand cts-on-gsi --skip-device-info \
      --skip-preconditions -m CtsHostsideNetworkTests \
      -t com.android.cts.net.HostsideRestrictBackgroundNetworkTests

Change-Id: I782f8a06922622d28f9a9d5c9f2afa2b12f8aa80
Merged-In: I782f8a06922622d28f9a9d5c9f2afa2b12f8aa80

tests/cts/hostside/AndroidTest.xml

@@ -21,6 +21,7 @@
     <option name="config-descriptor:metadata" key="parameter" value="secondary_user" />
 
     <target_preparer class="com.android.cts.net.NetPolicyTestsPreparer" />
+    <target_preparer class="com.android.cts.net.NetworkPolicyTestsPreparer" />
 
     <target_preparer class="com.android.tradefed.targetprep.RunCommandTargetPreparer">
         <option name="teardown-command" value="cmd power set-mode 0" />

tests/cts/hostside/app/src/com/android/cts/net/hostside/RequiredPropertiesRule.java

@@ -59,12 +59,12 @@ public class RequiredPropertiesRule extends BeforeAfterRule {
             }
             for (Property requiredProperty : requiredProperties.value()) {
                 for (Property p : Property.values()) {
-                    if (p.getValue() == ~requiredProperty.getValue()) {
-                        if (!allRequiredProperties.contains(p)) {
-                            allRequiredProperties.add(requiredProperty);
-                        }
+                    if (p.getValue() == ~requiredProperty.getValue()
+                            && allRequiredProperties.contains(p)) {
+                        continue;
                     }
                 }
+                allRequiredProperties.add(requiredProperty);
             }
         }
         return allRequiredProperties;

tests/cts/hostside/src/com/android/cts/net/NetworkPolicyTestsPreparer.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.cts.net;
+
+import com.android.tradefed.device.DeviceNotAvailableException;
+import com.android.tradefed.device.ITestDevice;
+import com.android.tradefed.invoker.TestInformation;
+import com.android.tradefed.log.LogUtil;
+import com.android.tradefed.targetprep.ITargetPreparer;
+
+public class NetworkPolicyTestsPreparer implements ITargetPreparer {
+    private ITestDevice mDevice;
+    private String mOriginalAppStandbyEnabled;
+
+    @Override
+    public void setUp(TestInformation testInformation) throws DeviceNotAvailableException {
+        mDevice = testInformation.getDevice();
+        mOriginalAppStandbyEnabled = getAppStandbyEnabled();
+        setAppStandbyEnabled("1");
+        LogUtil.CLog.d("Original app_standby_enabled: " + mOriginalAppStandbyEnabled);
+    }
+
+    @Override
+    public void tearDown(TestInformation testInformation, Throwable e)
+            throws DeviceNotAvailableException {
+        setAppStandbyEnabled(mOriginalAppStandbyEnabled);
+    }
+
+    private void setAppStandbyEnabled(String appStandbyEnabled) throws DeviceNotAvailableException {
+        if ("null".equals(appStandbyEnabled)) {
+            executeCmd("settings delete global app_standby_enabled");
+        } else {
+            executeCmd("settings put global app_standby_enabled " + appStandbyEnabled);
+        }
+    }
+
+    private String getAppStandbyEnabled() throws DeviceNotAvailableException {
+        return executeCmd("settings get global app_standby_enabled").trim();
+    }
+
+    private String executeCmd(String cmd) throws DeviceNotAvailableException {
+        final String output = mDevice.executeShellCommand(cmd).trim();
+        LogUtil.CLog.d("Output for '%s': %s", cmd, output);
+        return output;
+    }
+}