Add unit tests for improve the coverage.

Makefile

@@ -8,6 +8,7 @@ lint:
 publish:
 	webpack ./
 	uglifyjs dist/markdown-it-imsize.js > dist/markdown-it-imsize.min.js
+	bower register markdown-it-imsize https://github.com/tatsy/markdown-it-imsize.git
 
 test: lint
 	mocha

bower.json

@@ -18,6 +18,6 @@
     "test",
     "helpers",
     "Makefile",
-    "index*"
+    "lib"
   ]
 }

lib/imsize/index.js

@@ -28,7 +28,7 @@ function lookup(buffer, filepath) {
 }
 
 function asyncFileToBuffer(filepath, callback) {
-  fs.oepn(filepath, 'r', function(err0, descriptor) {
+  fs.open(filepath, 'r', function(err0, descriptor) {
     if (err0) {
       return callback(err0);
     }

package.json

@@ -29,6 +29,7 @@
     "markdown-it": "^3.0.4",
     "markdown-it-testgen": "^0.1.4",
     "mocha": "^2.1.0",
+    "should": "^5.0.0",
     "uglify-js": "^2.4.16",
     "webpack": "^1.5.3"
   }

test/test.js

@@ -3,6 +3,7 @@
 var assert = require('assert');
 var path = require('path');
 var generate = require('markdown-it-testgen');
+var should = require('should');
 
 describe('markdown-it-imsize', function() {
   var md = require('markdown-it')({
@@ -23,9 +24,10 @@ describe('markdown-it-imsize (autofill)', function() {
 });
 
 describe('image size detector', function() {
-  it('image size detector', function(done) {
   var imsize = require('../lib/imsize');
   var types = require('../lib/imsize/types');
+
+  it('image size detector', function(done) {
     types.forEach(function(type) {
       var dim = imsize('./test/img/lena.' + type);
       assert.equal(dim.width, 128);
@@ -33,4 +35,18 @@ describe('image size detector', function() {
     });
     done();
   });
+
+  it('imsize detector anync', function() {
+    types.forEach(function(type) {
+      imsize('./test/img/lena.' + type, function(err, dim) {
+        assert.equal(dim.width, 128);
+        assert.equal(dim.height, 128);
+      });
+    });
+  });
+
+  it('invalid operation', function(done) {
+    (function() { imsize('./test/img/lena.svg') }).should.throw();
+    done();
+  });
 });