diff --git a/tests/posix.rs b/tests/posix.rs
index c7f9e8a3..4b440fe5 100644
--- a/tests/posix.rs
+++ b/tests/posix.rs
@@ -141,3 +141,8 @@ fn background_command() {
     // TODO: How to test the output with a PID in it?
     // assert_posix!("sleep 1 & echo 1", "1\n", "[1]\t(\d*)\n");
 }
+
+#[test]
+fn equal_sign() {
+    assert_posix!("echo =", "=\n");
+}