diff --git a/tests/Cargo.toml b/tests/Cargo.toml
index e74bbb37ba..55c99f956a 100644
--- a/tests/Cargo.toml
+++ b/tests/Cargo.toml
@@ -9,6 +9,7 @@ convert_osm = { path = "../convert_osm" }
 dimensioned = { git = "https://github.com/paholg/dimensioned", rev = "0e1076ebfa5128d1ee544bdc9754c948987b6fe3", features = ["serde"] }
 gag = "0.1.10"
 geom = { path = "../geom" }
+log = "0.4.5"
 map_model = { path = "../map_model" }
 sim = { path = "../sim" }
 structopt = "0.2"
diff --git a/tests/src/main.rs b/tests/src/main.rs
index a52e84001e..d5a3603620 100644
--- a/tests/src/main.rs
+++ b/tests/src/main.rs
@@ -3,6 +3,7 @@ extern crate convert_osm;
 extern crate dimensioned;
 extern crate gag;
 extern crate geom;
+extern crate log;
 extern crate map_model;
 extern crate sim;
 extern crate structopt;
@@ -18,7 +19,12 @@ mod transit;
 
 use structopt::StructOpt;
 
+static LOG_ADAPTER: abstutil::LogAdapter = abstutil::LogAdapter;
+
 fn main() {
+    log::set_max_level(log::LevelFilter::Debug);
+    log::set_logger(&LOG_ADAPTER).unwrap();
+
     let mut t = runner::TestRunner::new(runner::Flags::from_args());
 
     map_conversion::run(t.suite("map_conversion"));