libsnapshot: add library for test helpers

Add libsnapshot_test_helpers for update engine tests
to properly set up depended modules.

Test: update_engine_unittests
Test: libsnapshot_test
Change-Id: Idd90a74cd6fb489f6ae14f44493b2288205c4a94

fs_mgr/libsnapshot/Android.bp

@@ -121,6 +121,34 @@ cc_library_static {
     ],
 }
 
+cc_library_static {
+    name: "libsnapshot_test_helpers",
+    defaults: ["libsnapshot_defaults"],
+    export_include_dirs: [
+        "include_test",
+    ],
+    srcs: [
+        "test_helpers.cpp",
+    ],
+    shared_libs: [
+        "android.hardware.boot@1.1",
+        "libcrypto",
+    ],
+    export_shared_lib_headers: [
+        "android.hardware.boot@1.1",
+    ],
+    header_libs: [
+        "libstorage_literals_headers",
+    ],
+    export_header_lib_headers: [
+        "libstorage_literals_headers",
+    ],
+    static_libs: [
+        "libgtest",
+        "libgmock",
+    ],
+}
+
 cc_test {
     name: "libsnapshot_test",
     defaults: ["libsnapshot_defaults"],
@@ -144,6 +172,7 @@ cc_test {
         "libgmock",
         "liblp",
         "libsnapshot",
+        "libsnapshot_test_helpers",
         "libsparse",
         "libz",
     ],

fs_mgr/libsnapshot/partition_cow_creator_test.cpp

@@ -18,9 +18,10 @@
 #include <liblp/builder.h>
 #include <liblp/property_fetcher.h>
 
+#include <libsnapshot/test_helpers.h>
+
 #include "dm_snapshot_internals.h"
 #include "partition_cow_creator.h"
-#include "test_helpers.h"
 #include "utility.h"
 
 using namespace android::fs_mgr;

fs_mgr/libsnapshot/snapshot_metadata_updater_test.cpp

@@ -24,7 +24,7 @@
 #include <liblp/builder.h>
 #include <storage_literals/storage_literals.h>
 
-#include "test_helpers.h"
+#include <libsnapshot/test_helpers.h>
 
 using namespace android::storage_literals;
 using android::fs_mgr::LpMetadata;

fs_mgr/libsnapshot/snapshot_test.cpp

@@ -38,7 +38,7 @@
 #include <storage_literals/storage_literals.h>
 
 #include <android/snapshot/snapshot.pb.h>
-#include "test_helpers.h"
+#include <libsnapshot/test_helpers.h>
 #include "utility.h"
 
 namespace android {

fs_mgr/libsnapshot/test_helpers.cpp

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "test_helpers.h"
+#include <libsnapshot/test_helpers.h>
 
 #include <android-base/file.h>
 #include <android-base/logging.h>