diff --git a/bin/ps-tree.js b/bin/ps-tree.js
new file mode 100644
index 0000000..1a008a4
--- /dev/null
+++ b/bin/ps-tree.js
@@ -0,0 +1,5 @@
+#!/usr/bin/env node
+'use strict';
+require('../')(process.argv[2] || 1, function (err, data) {
+  console.log(data)
+});
diff --git a/index.js b/index.js
index 3023de7..bb4a425 100755
--- a/index.js
+++ b/index.js
@@ -11,6 +11,9 @@ function childrenOfPid( pid, callback) {
   if('number' == typeof pid) {
     pid = pid.toString()
   }
+  else{
+    pid = parseInt(pid, 10).toString();
+  }
 
   es.connect(
     spawn('ps', ['-A', '-o', 'ppid,pid,stat,comm']).stdout,
@@ -28,7 +31,7 @@ function childrenOfPid( pid, callback) {
         }
         return cb(null, row)
       }
-      return cb()
+      return cb();
     }),
     es.writeArray(function (err, ps) {
       var parents = [pid], children = []
@@ -42,9 +45,3 @@ function childrenOfPid( pid, callback) {
     })
   ).on('error', callback)
 }
-
-if(!module.parent) {
-  childrenOfPid(process.argv[2] || 1, function (err, data) {
-  console.log(data)
-  })
-}
diff --git a/package.json b/package.json
index f7adee5..a1ab89a 100644
--- a/package.json
+++ b/package.json
@@ -30,6 +30,9 @@
 ,   "pre-commit": "0.0.9"
 ,   "tape": "^3.0.3"
   }
+, "pre-commit": [
+    "coverage"
+  ]
 , "engines": {
     "node": ">=0.10"
   }
diff --git a/test/direct.js b/test/direct.js
index 6a0a407..4263332 100644
--- a/test/direct.js
+++ b/test/direct.js
@@ -6,16 +6,15 @@ var cp = require('child_process');
 // var fs = require('fs');
 // fs.chmodSync('./index.js', 777);
 
-test(cyan('Directly Execute index.js without requiring the module'), function (t) {
+test(cyan('Directly Execute bin/ps-tree.js'), function (t) {
   var first = cp.exec("node -v", function(error, stdout, stderr) {
   })
-  var child = cp.exec("node ./index.js", function(error, data) {
-    console.log('data: ' + data.length);
+  var child = cp.exec("node ./bin/ps-tree.js", function(error, data) {
+    // console.log('data: ' + data.length);
     if (error !== null) {
         console.log(red('exec error: ' + error));
     }
   })
-  // console.log(first.pid)
-  t.true(child, green("✓ Called index.js directly. it worked."));
+  t.true(child.pid, green("✓ Called ./bin/ps-tree.js directly. worked as expected"));
   t.end();
 });
diff --git a/test/test.js b/test/test.js
index e130ce8..ccf8848 100644
--- a/test/test.js
+++ b/test/test.js
@@ -29,14 +29,14 @@ test(cyan('Spawn a Parent Process which has a Two Child Processes'), function (t
       t.equal(children.length, 0, green("✓ No more active child processes"));
       t.end();
     })
-  },200); // ensure the child process was both started and killed by psTree
+  },300); // ensure the child process was both started and killed by psTree
 });
 
-test(cyan('Attempt to call psTree without supplying a Callback'), function (t) {
+test(cyan('FORCE ERROR by calling psTree without supplying a Callback'), function (t) {
   var child = cp.exec("node ../index.js 12345", function(error, stdout, stderr) {
   })
   var errmsg = "Error: childrenOfPid(pid, callback) expects callback"
-  setTimeout(function(){
+  // setTimeout(function(){
     try {
       psTree(child.pid); // attempt to call psTree without a callback
     }
@@ -46,28 +46,20 @@ test(cyan('Attempt to call psTree without supplying a Callback'), function (t) {
     }
     t.end();
 
-  },100); // using setTimeout to ensure the child process gets started
+  // },100); // using setTimeout to ensure the child process gets started
 });
 
 
-test(cyan('Spawn a Child Process'), function (t) {
-  var first = cp.exec("node ./test/exec/child.js", function(error, stdout, stderr) {
-  })
-  var child = cp.exec("node ../index.js '"+first.pid +"'", function(error, stdout, stderr) {
+test(cyan('Spawn a Child Process and psTree with a String as pid'), function (t) {
+  var child = cp.exec("node ./test/exec/child.js", function(error, stdout, stderr) { });
+  psTree(child.pid.toString(), function (err, children) {
+    if(err){
+      console.log(err);
+    }
+    cp.spawn('kill', ['-9'].concat(children.map(function (p) { return p.PID })))
   })
   setTimeout(function(){
-    psTree(first.pid, function (err, children) {
-      if(err){
-        console.log(err);
-      }
-      // console.log("Children: ", children, '\n');
-      // t.equal(children.length, 2, green("✓ There are "+children.length+" active child processes"));
-      cp.spawn('kill', ['-9'].concat(children.map(function (p) { return p.PID })))
-    })
-  },100); // using setTimeout to ensure the child process gets started
-
-  setTimeout(function(){
-    psTree(child.pid, function (err, children) {
+    psTree(child.pid.toString(), function (err, children) {
       if(err){
         console.log(err);
       }
@@ -76,5 +68,5 @@ test(cyan('Spawn a Child Process'), function (t) {
       t.equal(children.length, 0, green("✓ No more active child processes"));
       t.end();
     })
-  },200); // ensure the child process was both started and killed by psTree
+  },300); // ensure the child process was both started and killed by psTree
 });