diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f3343a6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+vendor
+*debug*
\ No newline at end of file
diff --git a/EquilibriumIndex.php b/EquilibriumIndex.php
index 020dd2b..f883801 100644
--- a/EquilibriumIndex.php
+++ b/EquilibriumIndex.php
@@ -1,9 +1,41 @@
 <?php
+/*
+ * Find all equilibrium indices if any. Try to avoid nested loops if possible.
+ * It could be done with nested loops by adding up each left and right sum at
+ * each step through the array, but that yields a big-O of O(N^2). We can do
+ * better than that. Unnested, we stay at 2n or O(N).
+ *
+ * @param array $arr
+ * @return array Array of equilibrium indices
+ */
+function getEquilibriums(array $arr)
+{
+    $output = [];
+    $rightSum = 0;
+    $leftSum = 0;
 
-# Put a valid docblock here!
-function getEquilibriums($arr) {
-	$output = array();
-	# Logic goes here!
-	return $output;
-}
- 
+    // count them all up.
+    foreach ($arr as $val) {
+        $rightSum += $val;
+    }
+
+    // now move them over and compare.
+    foreach ($arr as $i => $val) {
+        // moving the pile here.
+        $rightSum -= $val;
+
+        // now compare the piles. Note we don't add to the left sum yet b/c we
+        // are standing on our index. Think of it as our viewing point. While
+        // we're standing on it, we can only survey those values on either side
+        // of us.
+        if ($rightSum == $leftSum) {
+            $output[] = $i;
+        }
+
+        // step off the viewing point and move it to the other side in prep for
+        // our next iteration.
+        $leftSum += $val;
+    }
+
+    return $output;
+}
\ No newline at end of file
diff --git a/README.md b/README.md
index c88ac00..5eb9b25 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,4 @@
-# Booj Code Test
-
-## Fun times with equilibrium indexes on an array.
+# Equilibrium Indices 
 
 ## What is an equilibrium index?
 An equilibrium index of a sequence is an index into the sequence such that the sum of elements at lower indices is equal to the sum of elements at higher indices.
@@ -8,7 +6,11 @@ An equilibrium index of a sequence is an index into the sequence such that the s
 ## Instructions
 Write a function that, given a sequence, returns its equilibrium indices (if any). Assume that the sequence may be very long. Feel free to Google for hints, but give lots of comments about what your thoughts are and your process for devising an algorithm.
 
-## Running the Test
-```
-phpunit EquilibriumIndexTest.php
-```
+## Set Up
+*NOTE:* The version of phpunit that is used here is only compatible with php 5.6 and higher. If you're on a Mac, head on over [here](http://aerendir.me/2015/08/01/how-to-upgrade-php-built-in-your-mac-osx/) for a good step-by-step guide to upgrade.
+
+Otherwise, install dependencies via composer: `Composer Install`.
+Don't have composer installed? Head on over to https://getcomposer.org to get it.
+
+## Running Your Tests
+`npm run phpunit --silent`
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..b45ea7d
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,5 @@
+{
+    "require": {
+        "phpunit/phpunit": "^5.7"
+    }
+}
\ No newline at end of file
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..63d2bb3
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,1326 @@
+{
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+        "This file is @generated automatically"
+    ],
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+                "ext-phar": "*",
+                "phpunit/phpunit": "~4.0",
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+            },
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+                    "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
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+                    "email": "ocramius@gmail.com",
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+                    "email": "sb@sebastian-bergmann.de",
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+            "source": {
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+                "url": "https://github.com/symfony/yaml.git",
+                "reference": "a7095af4b97a0955f85c8989106c249fa649011f"
+            },
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+                "reference": "a7095af4b97a0955f85c8989106c249fa649011f",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.5.9"
+            },
+            "require-dev": {
+                "symfony/console": "~2.8|~3.0"
+            },
+            "suggest": {
+                "symfony/console": "For validating YAML files using the lint command"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.2-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\Yaml\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony Yaml Component",
+            "homepage": "https://symfony.com",
+            "time": "2016-12-10T10:07:06+00:00"
+        },
+        {
+            "name": "webmozart/assert",
+            "version": "1.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozart/assert.git",
+                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f"
+            },
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+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/2db61e59ff05fe5126d152bd0655c9ea113e550f",
+                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.3 || ^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.6",
+                "sebastian/version": "^1.0.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.3-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Webmozart\\Assert\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Assertions to validate method input/output with nice error messages.",
+            "keywords": [
+                "assert",
+                "check",
+                "validate"
+            ],
+            "time": "2016-11-23T20:04:58+00:00"
+        }
+    ],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": [],
+    "platform-dev": []
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..8c1e700
--- /dev/null
+++ b/package.json
@@ -0,0 +1,12 @@
+{
+  "name": "codetest",
+  "version": "0.1.0",
+  "author": "Josh Badger",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/joshbadger/equilibrium.git"
+  },
+  "scripts": {
+    "phpunit": "vendor/phpunit/phpunit/phpunit EquilibriumIndexTest.php"
+  }
+}
\ No newline at end of file