Add rust_test for aconfig

Test: atest aconfig.test.rust
Change-Id: Ic1b201d05fb216c8d881667461e7750949752b4a
diff --git a/tools/aconfig/Android.bp b/tools/aconfig/Android.bp
index a4ea7f4..2764d23 100644
--- a/tools/aconfig/Android.bp
+++ b/tools/aconfig/Android.bp
@@ -133,3 +133,19 @@
         "server_configurable_flags",
     ],
 }
+
+rust_aconfig_library {
+    name: "libaconfig_test_rust_library",
+    crate_name: "aconfig_test_rust_library",
+    aconfig_declarations: "aconfig.test.flags",
+}
+
+rust_test {
+    name: "aconfig.test.rust",
+    srcs: [
+        "tests/aconfig_test.rs"
+    ],
+    rustlibs: [
+        "libaconfig_test_rust_library",
+    ],
+}
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