diff --git a/pandoc-lua-engine/test/lua/module/pandoc-mediabag.lua b/pandoc-lua-engine/test/lua/module/pandoc-mediabag.lua
index 5ff65ee44..f001bf8db 100644
--- a/pandoc-lua-engine/test/lua/module/pandoc-mediabag.lua
+++ b/pandoc-lua-engine/test/lua/module/pandoc-mediabag.lua
@@ -49,6 +49,30 @@ return {
     end),
   },
 
+  group 'fetch' {
+    test('populates media bag', function ()
+      local filename = 'lua/module/sample.svg'
+      local mime, contents = mediabag.fetch(filename)
+      assert.are_equal(mime, 'image/svg+xml')
+      assert.are_equal(contents:sub(1,5), '<?xml')
+      mediabag.empty() -- clean up
+    end),
+  },
+
+  group 'fill' {
+    test('populates media bag', function ()
+      local filename = 'lua/module/sample.svg'
+      local doc = pandoc.Pandoc {
+        pandoc.Image('testing', filename)
+      }
+      mediabag.fill(doc)
+      local mime, contents = mediabag.lookup(filename)
+      assert.are_equal(mime, 'image/svg+xml')
+      assert.are_equal(contents:sub(1,5), '<?xml')
+      mediabag.empty() -- clean up
+    end),
+  },
+
   group 'items' {
     test('iterates over all items', function ()
       local input_items = {
@@ -68,5 +92,16 @@ return {
       assert.are_same(seen_items, input_items)
       mediabag.empty() -- clean up
     end)
-  }
+  },
+
+  group 'lookup' {
+    test('returns MIME type and contents', function ()
+      mediabag.insert('test.html', 'text/html', '<aside>Who cares?</aside>')
+      local mime, contents = mediabag.lookup('test.html')
+      assert.are_equal(mime, 'text/html')
+      assert.are_equal(contents, '<aside>Who cares?</aside>')
+      mediabag.empty() -- clean up
+    end),
+  },
+
 }
diff --git a/pandoc-lua-engine/test/lua/module/sample.svg b/pandoc-lua-engine/test/lua/module/sample.svg
new file mode 100644
index 000000000..f1b427c43
--- /dev/null
+++ b/pandoc-lua-engine/test/lua/module/sample.svg
@@ -0,0 +1,37 @@
+<?xml version="1.0"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     viewBox="-35 -35 70 70">
+  <title>Single-Source-Publishing Logo</title>
+  <defs>
+    <g id="doc">
+      <!-- document shape -->
+      <polygon points="-10,-31.53 -10,-3.25 0,0 10,-3.25 10,-23.53 2,-31.53" />
+      <!-- the "fold" triangle -->
+      <polygon points="2,-23.53 2,-31.53 10,-23.53" fill-opacity="90%" />
+    </g>
+  </defs>
+
+  <g transform="rotate(30)">
+    <!-- colored docs -->
+    <g fill-opacity="75%">
+      <use href="#doc" fill="#ffce54" transform="rotate(000)" />
+      <use href="#doc" fill="#ed5564" transform="rotate(072)" />
+      <use href="#doc" fill="#ac92eb" transform="rotate(144)" />
+      <use href="#doc" fill="#4fc1e8" transform="rotate(216)" />
+      <use href="#doc" fill="#a0d568" transform="rotate(288)" />
+    </g>
+
+    <!-- Add blackish border -->
+    <g stroke="#555555"
+       stroke-width="0.5"
+       stroke-linejoin="round"
+       fill="none">
+      <use href="#doc" transform="rotate(000)" />
+      <use href="#doc" transform="rotate(072)" />
+      <use href="#doc" transform="rotate(144)" />
+      <use href="#doc" transform="rotate(216)" />
+      <use href="#doc" transform="rotate(288)" />
+    </g>
+  </g>
+</svg>