start a util unittest

Bug: None
Test: `make check` passes
Change-Id: I9a39bf72649f040b95be68a4fa8f799b6e7ead65
diff --git a/Android.bp b/Android.bp
index 03b0530..9dd17ea 100644
--- a/Android.bp
+++ b/Android.bp
@@ -236,6 +236,34 @@
     },
 }
 
+// Utility functionality unit tests using gtest.
+//
+// For a device, run with:
+// adb shell /data/nativetest/util_unittest_gtest/util_unittest_gtest
+//
+// For host, run with:
+// out/host/linux-x86/nativetest(64)/util_unittest_gtest/util_unittest_gtest
+// =========================================================
+cc_test {
+    name: "util_unittest_gtest",
+    defaults: ["libminijail_flags"],
+    host_supported: true,
+
+    srcs: [
+        "util.c",
+        "util_unittest.cc",
+    ] + unittestSrcFiles,
+
+    static_libs: ["libminijail_generated"],
+    shared_libs: minijailCommonLibraries,
+
+    target: {
+        android: {
+            test_suites: ["device-tests"],
+        },
+    },
+}
+
 // libminijail_test executable for brillo_Minijail test.
 // =========================================================
 cc_test {