diff --git a/sim/src/testlog.rs b/sim/src/testlog.rs
new file mode 100644
index 0000000..c62e007
--- /dev/null
+++ b/sim/src/testlog.rs
@@ -0,0 +1,19 @@
+//! Logging support for the test framework.
+//!
+//! https://stackoverflow.com/questions/30177845/how-to-initialize-the-logger-for-integration-tests
+//!
+//! The test framework runs the tests, possibly simultaneously, and in various orders.  This helper
+//! function, which should be called at the beginning of each test, will setup logging for all of
+//! the tests.
+
+use env_logger;
+use std::sync::{Once, ONCE_INIT};
+
+static INIT: Once = ONCE_INIT;
+
+/// Setup the logging system.  Intended to be called at the beginning of each test.
+pub fn setup() {
+    INIT.call_once(|| {
+        env_logger::init().unwrap();
+    });
+}