TEST_MAPPING: test dependers of this crate

Bug: 168167373
Test: TH
Change-Id: If727ee009351085bf7d28b3eca946ed9126d7c4d
diff --git a/TEST_MAPPING b/TEST_MAPPING
new file mode 100644
index 0000000..7d1919a
--- /dev/null
+++ b/TEST_MAPPING
@@ -0,0 +1,12 @@
+// Generated by cargo2android.py for tests in Android.bp
+{
+  "presubmit": [
+    {
+      "host": true,
+      "name": "futures-util_host_test_src_lib"
+    },
+    {
+      "name": "futures-util_device_test_src_lib"
+    }
+  ]
+}