added preliminary unit tests, not working yet, because the vimperator object cannot be found in this context.

mozunit.js

@@ -0,0 +1,19 @@
+var TestCase = mozlab.mozunit.TestCase;
+var assert = mozlab.mozunit.assertions;
+
+var tc = new TestCase('vimperator testcase description here');
+
+//var vimperator = new Vimperator();
+
+tc.tests = {
+    'First test is successful': function() {
+        assert.isTrue(true);
+    },
+
+	'Checking a working echo()': function() {
+		assert.isTrue(vimperator.echo("test"));
+	},
+	'Checking the non working ex.echo()': function() {
+		assert.isTrue(vimperator.ex.echo("test"));
+	}
+}