Fix golangci-lint findings

Fix findings by golangci-lint run.

Author: HeavyWombat

term_test.go

@@ -61,7 +61,8 @@ func CaptureStdout(f func()) string {
 	w.Close()
 
 	var buf bytes.Buffer
-	io.Copy(&buf, r)
+	_, err = io.Copy(&buf, r)
+	Expect(err).ToNot(HaveOccurred())
 
 	return buf.String()
 }