diff --git a/test/env.cpp b/test/env.cpp
new file mode 100644
index 0000000..934b9a0
--- /dev/null
+++ b/test/env.cpp
@@ -0,0 +1,31 @@
+#include "env_mock.hpp"
+
+// Set this before each test that hits a call to getEnv().
+EnvInterface* envIntf = nullptr;
+
+namespace env
+{
+
+std::string getEnv(const char* key)
+{
+    return (envIntf) ? envIntf->getEnv(key) : "";
+}
+
+std::string getEnv(const char* prefix, const SensorSet::key_type& sensor)
+{
+    return (envIntf) ? envIntf->getEnv(prefix, sensor) : "";
+}
+
+std::string getEnv(const char* prefix, const std::string& type,
+                   const std::string& id)
+{
+    return (envIntf) ? envIntf->getEnv(prefix, type, id) : "";
+}
+
+std::string getIndirectID(std::string path, const std::string& fileSuffix,
+                          const SensorSet::key_type& sensor)
+{
+    return (envIntf) ? envIntf->getIndirectID(path, fileSuffix, sensor) : "";
+}
+
+} // namespace env