fix digest binary + add test for it

bin/digest

@@ -3,7 +3,12 @@
 var omnivore = require('..');
 var path = require('path');
 
-var filepath = path.resolve(__dirname, process.argv[2]);
+if (!process.argv[2]) {
+    console.log('Please provide the path to geodata');
+    process.exit(1);
+}
+
+var filepath = process.argv[2];
 
 omnivore.digest(filepath, function(err, metadata) {
   if (err) throw err;

index.js

@@ -31,7 +31,7 @@ function digest(file, callback) {
  */
 function getMetadata(file, callback) {
     var metadata = {};
-    //Get filsize from fs.stats
+    //Get filesize from fs.stats
     fs.stat(file, function(err, stats) {
         if (err) return callback(invalid('Error getting stats from file. File might not exist.'));
         var filesize = stats['size'];

test/digest-bin.test.js

@@ -0,0 +1,27 @@
+var tape = require('tape'),
+    path = require('path'),
+    fs = require('fs'),
+    cp = require('child_process');
+    testData = path.dirname(require.resolve('mapnik-test-data')),
+    mapnik_omnivore = require('../index.js');
+
+var expectedMetadata_world_merc = JSON.parse(fs.readFileSync(path.resolve('test/fixtures/metadata_world_merc.json')));
+
+tape('[digest bin] should return expected metadata', function(assert) {
+    var file = path.join(testData,'data/shp/world_merc/world_merc.shp');
+    var command = path.join(__dirname,"../bin/digest");
+    command += " " + file;
+    cp.exec(command,{}, function(err,stdout,stderr) {
+        if (err) return done(err);
+        assert.ok(err === null);
+        try {
+            assert.deepEqual(JSON.parse(stdout), expectedMetadata_world_merc);
+        } catch (err) {
+            console.log(err);
+            console.log("Expected mapnik-omnivore metadata has changed. Writing new metadata to file.");
+            fs.writeFileSync(path.resolve('test/fixtures/metadata_world_merc.json'), JSON.stringify(metadata));
+        }
+        assert.end();
+    });
+});
+