diff --git a/tests/test_cat.rs b/tests/test_cat.rs
index d6afe047c..73f55f5a0 100644
--- a/tests/test_cat.rs
+++ b/tests/test_cat.rs
@@ -24,6 +24,7 @@ where
 
     let mut cmd = wrk.command("cat");
     modify_cmd(cmd.arg(which).arg("in1.csv").arg("in2.csv"));
+    wrk.assert_success(&mut cmd);
     wrk.read_stdout(&mut cmd)
 }
 
diff --git a/tests/test_snappy.rs b/tests/test_snappy.rs
index 0ad175053..a30f25718 100644
--- a/tests/test_snappy.rs
+++ b/tests/test_snappy.rs
@@ -164,6 +164,8 @@ fn snappy_automatic_decompression() {
     let mut cmd = wrk.command("count");
     cmd.arg(test_file);
 
+    wrk.assert_success(&mut cmd);
+
     let got: String = wrk.stdout(&mut cmd);
     let expected = "100";
     assert_eq!(got, expected);