diff --git a/lib/process/processLauncher.js b/lib/process/processLauncher.js
index 7086d696..e58db305 100644
--- a/lib/process/processLauncher.js
+++ b/lib/process/processLauncher.js
@@ -111,7 +111,7 @@ class ProcessLauncher {
    */
   subscribeTo(key, value, callback) {
     if (this.subscriptions[key]) {
-      this.subscriptions[key].push(value);
+      this.subscriptions[key].push({value, callback});
       return;
     }
     this.subscriptions[key] = [{value, callback}];
@@ -131,7 +131,7 @@ class ProcessLauncher {
     if (this.subscriptions[key]) {
       this.subscriptions[key].filter((val, index) => {
         if (val.value === value) {
-          this.subscriptions[key] = this.subscriptions[key].splice(index, 1);
+          this.subscriptions[key].splice(index, 1);
         }
       });
     }
@@ -141,7 +141,7 @@ class ProcessLauncher {
    * Unsubscribes from all subscriptions
    * @return {void}
    */
-  unsubsribeToAll() {
+  unsubscribeToAll() {
     this.subscriptions = {};
   }
 
diff --git a/test/processLauncher.js b/test/processLauncher.js
new file mode 100644
index 00000000..e75d2b4e
--- /dev/null
+++ b/test/processLauncher.js
@@ -0,0 +1,139 @@
+/*global describe, it, before, beforeEach*/
+const assert = require('assert');
+const sinon = require('sinon');
+const TestLogger = require('../lib/tests/test_logger.js');
+const ProcessLauncher = require('../lib/process/processLauncher');
+
+describe('ProcessWrapper', () => {
+  let processLauncher;
+
+  before(() => {
+    sinon.stub(ProcessLauncher.prototype, '_subscribeToMessages');
+    processLauncher = new ProcessLauncher({
+      logger: new TestLogger({})
+    });
+  });
+
+  describe('subscribeTo', () => {
+
+    beforeEach(() => {
+      processLauncher.subscriptions = {};
+    });
+
+    it('should create an array for the key value', function () {
+      processLauncher.subscribeTo('test', 'value', 'myCallback');
+      assert.deepEqual(processLauncher.subscriptions, {
+        "test": [
+          {
+            "callback": "myCallback",
+            "value": "value"
+          }
+        ]
+      });
+    });
+
+    it('should add another value to the key', () => {
+      processLauncher.subscribeTo('test', 'value', 'myCallback');
+      processLauncher.subscribeTo('test', 'value2', 'myCallback2');
+      assert.deepEqual(processLauncher.subscriptions, {
+        "test": [
+          {
+            "callback": "myCallback",
+            "value": "value"
+          },
+          {
+            "callback": "myCallback2",
+            "value": "value2"
+          }
+        ]
+      });
+    });
+  });
+
+  describe('unsubscribeTo', () => {
+    it('should remove the value for the key', () => {
+      processLauncher.subscriptions = {
+        "test": [
+          {
+            "callback": "myCallback",
+            "value": "value"
+          },
+          {
+            "callback": "myCallback2",
+            "value": "value2"
+          }
+        ]
+      };
+
+      processLauncher.unsubscribeTo('test', 'value2');
+      assert.deepEqual(processLauncher.subscriptions, {
+        "test": [
+          {
+            "callback": "myCallback",
+            "value": "value"
+          }
+        ]
+      });
+    });
+
+    it('should remove the whole key', () => {
+      processLauncher.subscriptions = {
+        "test": [
+          {
+            "callback": "myCallback",
+            "value": "value"
+          }
+        ]
+      };
+
+      processLauncher.unsubscribeTo('test');
+      assert.deepEqual(processLauncher.subscriptions, {test: []});
+    });
+  });
+
+  describe('unsubscribeToAll', () => {
+    it('clears every subscriptions', () => {
+      processLauncher.subscriptions = {
+        "test": [
+          {
+            "callback": "myCallback",
+            "value": "value"
+          }
+        ]
+      };
+
+      processLauncher.unsubscribeToAll();
+      assert.deepEqual(processLauncher.subscriptions, {});
+    });
+  });
+
+  describe('_checkSubscriptions', function () {
+    it('should not do anything if not in subscription', function () {
+      const callback = sinon.stub();
+      processLauncher.subscriptions = {
+        "test": [
+          {
+            "callback": callback,
+            "value": "value"
+          }
+        ]
+      };
+      processLauncher._checkSubscriptions({does: 'nothing', for: 'real'});
+      assert.strictEqual(callback.callCount, 0);
+    });
+
+    it('should call the callback', function () {
+      const callback = sinon.stub();
+      processLauncher.subscriptions = {
+        "test": [
+          {
+            "callback": callback,
+            "value": "value"
+          }
+        ]
+      };
+      processLauncher._checkSubscriptions({test: 'value'});
+      assert.strictEqual(callback.callCount, 1);
+    });
+  });
+});