Add test for #999

test/books/structure/glossary.md

@@ -0,0 +1,5 @@
+# Glossary
+
+### Hello
+
+Hello world

test/structure.js

@@ -1,8 +1,20 @@
 describe('Structure', function () {
-    it('should prioritize structure defined in book.json', function() {
+    var book;
+
+    before(function() {
         return books.parse('structure')
-            .then(function(book) {
-                book.readmeFile.should.equal('README.adoc');
+            .then(function(_book) {
+                book = _book;
             });
     });
+
+
+    it('should prioritize structure defined in book.json', function() {
+        book.readmeFile.should.equal('README.adoc');
+    });
+
+    it('should be case incensitive', function() {
+        book.glossaryFile.should.equal('glossary.md');
+        book.glossary.should.have.lengthOf(1);
+    });
 });