1 /*
2  * Copyright 2022 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package platform.test.screenshot
18 
19 import java.util.TimeZone
20 import org.junit.rules.TestRule
21 import org.junit.runner.Description
22 import org.junit.runners.model.Statement
23 
24 /**
25  * A rule to change the system colors using the given [seedColorHex].
26  *
27  * This is especially useful to change the colors before starting an activity using an
28  * [ActivityScenarioRule] or any other rule.
29  */
30 class TimeZoneRule(private val tz: String = "GMT") : TestRule {
applynull31     override fun apply(base: Statement, description: Description): Statement {
32         return object : Statement() {
33             override fun evaluate() {
34                 lateinit var previousTZ: TimeZone
35                 try {
36                     // Save the current value of tz, to be restored later
37                     previousTZ = TimeZone.getDefault()
38                     TimeZone.setDefault(TimeZone.getTimeZone(tz))
39                     base.evaluate()
40                 } finally {
41                     // Restore the previous timezone.
42                     TimeZone.setDefault(previousTZ)
43                 }
44             }
45         }
46     }
47 }
48