tools/android/webgpu/src/androidTest/java/androidx/webgpu/ErrorTest.kt

/*
 * Copyright 2025 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 androidx.webgpu

import androidx.test.ext.junit.runners.AndroidJUnit4
import androidx.test.filters.SmallTest
import androidx.webgpu.ValidationException
import androidx.webgpu.helper.createWebGpu
import java.util.concurrent.Executors
import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.ExecutorCoroutineDispatcher
import kotlinx.coroutines.asCoroutineDispatcher
import kotlinx.coroutines.cancel
import kotlinx.coroutines.launch
import kotlinx.coroutines.runBlocking
import org.junit.Assert.assertThrows
import org.junit.Test
import org.junit.runner.RunWith

@RunWith(AndroidJUnit4::class)
@SmallTest
class ErrorTest {
  private val dispatcher: CoroutineDispatcher = Executors.newSingleThreadExecutor { runnable ->
    Thread(runnable, "Test-WebGPU-Thread")
  }.asCoroutineDispatcher()
  private val testScope = CoroutineScope(dispatcher)

  @Test
    /**
     * Test that an invalid parameter raises an error that is converted to a Kotlin exception by
     * the adapter in DawnTestLauncher.
     */
  fun errorTest() {
    runBlocking {
      val webGpu = createWebGpu(dispatcher)
      val device = webGpu.device
      testScope.launch {
        webGpu.processEventsLoop()
      }
      try {
        val unused = webGpu.execute {
          assertThrows(ValidationException::class.java) {
            device.createTexture(
              GPUTextureDescriptor(
                usage = TextureUsage.None,
                size = GPUExtent3D(0)
              )
            )
          }
        }
      } finally {
        webGpu.close()
        testScope.cancel()
        (dispatcher as? ExecutorCoroutineDispatcher)?.close()
      }
    }
  }

  @Test
  fun testRecurringUncapturedErrorCallbackDoesNotDoubleFree() {
    runBlocking {
      val webGpu = createWebGpu(dispatcher)
      val device = webGpu.device
      testScope.launch {
        webGpu.processEventsLoop()
      }
      try {
        val unused = webGpu.execute {
          // 1st uncaptured error -> invokes uncapturedErrorCallback (without fix, deletes userData1)
          assertThrows(ValidationException::class.java) {
            device.createTexture(
              GPUTextureDescriptor(
                usage = TextureUsage.None,
                size = GPUExtent3D(0)
              )
            )
          }

          // 2nd uncaptured error -> invokes uncapturedErrorCallback again.
          assertThrows(ValidationException::class.java) {
            device.createTexture(
              GPUTextureDescriptor(
                usage = TextureUsage.None,
                size = GPUExtent3D(0)
              )
            )
          }
        }
      } finally {
        webGpu.close()
        testScope.cancel()
        (dispatcher as? ExecutorCoroutineDispatcher)?.close()
      }
    }
  }
}