Fix deleting temp directories

utils/src/main/java/org/robolectric/util/TempDirectory.java

@@ -1,5 +1,7 @@
 package org.robolectric.util;
 
+import static java.util.concurrent.TimeUnit.SECONDS;
+
 import java.io.IOException;
 import java.io.Writer;
 import java.nio.file.FileAlreadyExistsException;
@@ -50,14 +52,21 @@ public TempDirectory(String name) {
     }
   }
 
-  private static void clearAllDirectories() {
+  static void clearAllDirectories() {
     ExecutorService deletionExecutorService = Executors.newFixedThreadPool(DELETE_THREAD_POOL_SIZE);
     synchronized (tempDirectoriesToDelete) {
       for (TempDirectory undeletedDirectory : tempDirectoriesToDelete) {
         deletionExecutorService.execute(undeletedDirectory::destroy);
       }
     }
     deletionExecutorService.shutdown();
+    try {
+      deletionExecutorService.awaitTermination(5, SECONDS);
+    } catch (InterruptedException e) {
+      deletionExecutorService.shutdownNow();
+      // Preserve interrupt status
+      Thread.currentThread().interrupt();
+    }
   }
 
   public Path createFile(String name, String contents) {

utils/src/test/java/org/robolectric/util/TempDirectoryTest.java

@@ -18,4 +18,15 @@ public void createsDirsWithSameParent() throws IOException {
     Path path2 = tempDir.create("dir2");
     assertThat(path.getParent().toString()).isEqualTo(path2.getParent().toString());
   }
+
+  @Test
+  public void clearAllDirectories_removesDirectories() {
+    TempDirectory tempDir = new TempDirectory("temp_dir");
+    Path dir = tempDir.create("dir1");
+    Path file = tempDir.create("file1");
+    TempDirectory.clearAllDirectories();
+    assertThat(dir.toFile().exists()).isFalse();
+    assertThat(file.toFile().exists()).isFalse();
+    assertThat(dir.getParent().toFile().exists()).isFalse();
+  }
 }