diff --git a/testdata/rt_fm errors.txt b/testdata/rt_fm errors.txt
new file mode 100644
index 0000000..582a19b
--- /dev/null
+++ b/testdata/rt_fm errors.txt	
@@ -0,0 +1,7 @@
+Error Messages from RTL_FM
+
+fprintf(stderr, "Signal caught, exiting!\n");
+fprintf(stderr, "Failed to open rtlsdr device #%d.\n", dongle.dev_index);
+fprintf(stderr, "Failed to open %s\n", output.filename);
+fprintf(stderr, "\nUser cancel, exiting...\n");
+fprintf(stderr, "\nLibrary error %d, exiting...\n", r);
\ No newline at end of file