Add an annotation for ignoring tests by dev SDK am: 4c0e46b3 am: b16efe32...

/*

 * 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.testutils

import android.os.Build

import org.junit.Assume.assumeTrue

import org.junit.rules.TestRule

import org.junit.runner.Description

import org.junit.runners.model.Statement

/**

 * A test rule to ignore tests based on the development SDK level.

 *

 * If the device is not using a release SDK, the development SDK is considered to be higher than

 * [Build.VERSION.SDK_INT].

 */

class DevSdkIgnoreRule : TestRule {

    override fun apply(base: Statement, description: Description): Statement {

        return IgnoreBySdkStatement(base, description)

    }

    /**

     * Ignore the test for any development SDK that is strictly after [value].

     *

     * If the device is not using a release SDK, the development SDK is considered to be higher

     * than [Build.VERSION.SDK_INT].

     */

    annotation class IgnoreAfter(val value: Int)

    /**

     * Ignore the test for any development SDK that lower than or equal to [value].

     *

     * If the device is not using a release SDK, the development SDK is considered to be higher

     * than [Build.VERSION.SDK_INT].

     */

    annotation class IgnoreUpTo(val value: Int)

    private class IgnoreBySdkStatement(

        private val base: Statement,

        private val description: Description

    ) : Statement() {

        override fun evaluate() {

            val ignoreAfter = description.getAnnotation(IgnoreAfter::class.java)

            val ignoreUpTo = description.getAnnotation(IgnoreUpTo::class.java)

            // In-development API n+1 will have SDK_INT == n and CODENAME != REL.

            // Stable API n has SDK_INT == n and CODENAME == REL.

            val release = "REL" == Build.VERSION.CODENAME

            val sdkInt = Build.VERSION.SDK_INT

            val devApiLevel = sdkInt + if (release) 0 else 1

            val message = "Skipping test for ${if (!release) "non-" else ""}release SDK $sdkInt"

            assumeTrue(message, ignoreAfter == null || devApiLevel <= ignoreAfter.value)

            assumeTrue(message, ignoreUpTo == null || devApiLevel > ignoreUpTo.value)

            base.evaluate()

        }

    }

}

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