Add cow_api_test to presubmit.

These are unit tests for important VAB functionality. They are very
quick to run and should be included in presubmit testing.

Bug: N/A
Test: th green
Change-Id: I02e24c76df365e9fb2d68f904e930dce60b9bdaf
diff --git a/fs_mgr/TEST_MAPPING b/fs_mgr/TEST_MAPPING
index a349408..84709b6 100644
--- a/fs_mgr/TEST_MAPPING
+++ b/fs_mgr/TEST_MAPPING
@@ -17,6 +17,9 @@
     },
     {
       "name": "libsnapshot_fuzzer_test"
+    },
+    {
+      "name": "cow_api_test"
     }
   ]
 }
diff --git a/fs_mgr/libsnapshot/Android.bp b/fs_mgr/libsnapshot/Android.bp
index adfb56c..104484d 100644
--- a/fs_mgr/libsnapshot/Android.bp
+++ b/fs_mgr/libsnapshot/Android.bp
@@ -479,6 +479,9 @@
         "libgtest",
         "libsnapshot_cow",
     ],
+    test_suites: [
+        "device-tests"
+    ],
     test_min_api_level: 30,
     auto_gen_config: true,
     require_root: false,