add unit tests for pcm_* functions
diff --git a/WORKSPACE b/WORKSPACE
new file mode 100644
index 0000000..02b57bf
--- /dev/null
+++ b/WORKSPACE
@@ -0,0 +1,7 @@
+load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")
+
+git_repository(
+    name = "googletest",
+    remote = "https://github.com/google/googletest",
+    branch = "master",
+)