Adding testing for slot generation

Bug: 129351223
Test: build, boot, libsurfaceflinger_unittest
Change-Id: Ieb4d16d11b287bbb66a364b6d4c633305555b518
diff --git a/services/surfaceflinger/tests/unittests/Android.bp b/services/surfaceflinger/tests/unittests/Android.bp
index 85e9ce5..f842d61 100644
--- a/services/surfaceflinger/tests/unittests/Android.bp
+++ b/services/surfaceflinger/tests/unittests/Android.bp
@@ -35,7 +35,8 @@
     srcs: [
         ":libsurfaceflinger_sources",
         "libsurfaceflinger_unittest_main.cpp",
-        "CompositionTest.cpp",
+        "CachingTest.cpp",
+	"CompositionTest.cpp",
         "DispSyncSourceTest.cpp",
         "DisplayIdentificationTest.cpp",
         "DisplayTransactionTest.cpp",