diff --git a/lib/covershot.js b/lib/covershot.js
index 16c56ea..cb03e91 100644
--- a/lib/covershot.js
+++ b/lib/covershot.js
@@ -51,11 +51,8 @@ exports.replace = function (regex, replacement) {
   replacements.push({ regex: regex, replacement: replacement });
 };
 
-process.on('SIGTERM', onExit);
-process.on('exit', onExit);
-
 var coverageWritten = false;
-function onExit() {
+var writeCoverage = exports.writeCoverage = function () {
   if (coverageWritten) {
     return;
   }
@@ -81,4 +78,6 @@ function onExit() {
 
   var json = JSON.stringify(mapper.map(coverage));
   fs.writeFileSync(filename, json);
-}
+};
+
+process.on('exit', writeCoverage);