2 files changed, 61 insertions, 1 deletions
diff --git a/lib/modifiers/summary/__tests__/insertPart.js b/lib/modifiers/summary/__tests__/insertPart.js
new file mode 100644
index 0000000..11c2cbc
--- /dev/null
+++ b/lib/modifiers/summary/__tests__/insertPart.js
@@ -0,0 +1,60 @@
+var Summary = require('../../../models/summary');
+var SummaryPart = require('../../../models/summaryPart');
+
+var File = require('../../../models/file');
+
+describe('insertPart', function() {
+    var insertPart = require('../insertPart');
+    var summary = Summary.createFromParts(File(), [
+        {
+            articles: [
+                {
+                    title: '1.1',
+                    path: '1.1'
+                }
+            ]
+        },
+        {
+            title: 'Part I',
+            articles: [
+                {
+                    title: '2.1',
+                    path: '2.1',
+                    articles: []
+                },
+                {
+                    title: '2.2',
+                    path: '2.2'
+                }
+            ]
+        }
+    ]);
+
+    it('should insert an part at a given level', function() {
+        var part = SummaryPart.create({
+            title: 'Inserted'
+        }, 'meaningless.level');
+
+        var newSummary = insertPart(summary, part, 1);
+
+        var inserted = newSummary.getPart(1);
+        expect(inserted.getTitle()).toBe('Inserted');
+        expect(newSummary.getParts().count()).toBe(3);
+
+        var otherArticle = newSummary.getByLevel('3.1');
+        expect(otherArticle.getTitle()).toBe('2.1');
+        expect(otherArticle.getLevel()).toBe('3.1');
+    });
+
+    it('should insert an part in last position', function() {
+        var part = SummaryPart.create({
+            title: 'Inserted'
+        }, 'meaningless.level');
+
+        var newSummary = insertPart(summary, part, 2);
+
+        var inserted = newSummary.getPart(2);
+        expect(inserted.getTitle()).toBe('Inserted');
+        expect(newSummary.getParts().count()).toBe(3);
+    });
+});
diff --git a/lib/parse/lookupStructureFile.js b/lib/parse/lookupStructureFile.js
index d4a8f02..36b37f8 100644
--- a/lib/parse/lookupStructureFile.js
+++ b/lib/parse/lookupStructureFile.js
@@ -6,7 +6,7 @@ var findParsableFile = require('./findParsableFile');
 
     @param {Book} book
     @param {String} type: one of ["glossary", "readme", "summary", "langs"]
-    @return {Promise<File>} The path of the file found, relative
+    @return {Promise<File | Undefined>} The path of the file found, relative
     to the book content root.
 */
 function lookupStructureFile(book, type) {