Don't allow expired blobs to be accessed.

Bug: 147722548
Test: atest --test-mapping apex/blobstore
Change-Id: I7294124ba5ce3dcf42a0e7e9858311b1604ae185
diff --git a/tests/BlobStoreTestUtils/Android.bp b/tests/BlobStoreTestUtils/Android.bp
index 5c7c68b..53d3638 100644
--- a/tests/BlobStoreTestUtils/Android.bp
+++ b/tests/BlobStoreTestUtils/Android.bp
@@ -18,6 +18,7 @@
   static_libs: [
     "truth-prebuilt",
     "androidx.test.uiautomator_uiautomator",
+    "androidx.test.ext.junit",
   ],
   sdk_version: "test_current",
 }
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