androidbp: Test valueToString

Change-Id: I358cf4bb020fc4db14792e2cdffc18bc2f89f4d4
diff --git a/Android.bp b/Android.bp
index da0e55b..2a21d3d 100644
--- a/Android.bp
+++ b/Android.bp
@@ -194,6 +194,9 @@
         "androidbp/cmd/androidbp.go",
         "androidbp/cmd/soong.go",
     ],
+    testSrcs: [
+        "androidbp/cmd/androidbp_test.go",
+    ],
     deps: [
         "blueprint-parser",
     ],