diff --git a/spec/fixtures/basic.glug b/spec/fixtures/basic.glug
new file mode 100644
index 0000000..983b8e0
--- /dev/null
+++ b/spec/fixtures/basic.glug
@@ -0,0 +1,13 @@
+version 8
+name 'My first stylesheet'
+source :shortbread, type: 'vector', url: 'https://vector.openstreetmap.org/shortbread_v1/tilejson.json'
+
+layer(:roads, zoom: 10..13, source: :shortbread) do
+  line_width 6
+  line_color match(highway,
+                   'motorway', :blue,
+                   'trunk', :green,
+                   'primary', :red,
+                   'secondary', :orange,
+                   0x888888)
+end
diff --git a/spec/fixtures/basic.json b/spec/fixtures/basic.json
new file mode 100644
index 0000000..b70b9fe
--- /dev/null
+++ b/spec/fixtures/basic.json
@@ -0,0 +1,36 @@
+{
+  "version":8,
+  "name":"My first stylesheet",
+  "sources":{
+    "shortbread":{
+      "type":"vector",
+      "url":"https://vector.openstreetmap.org/shortbread_v1/tilejson.json"
+    }
+  },
+  "layers":[
+    {
+      "paint":{
+        "line-width":6,
+        "line-color":[
+          "match",
+          ["get","highway"],
+          "motorway",
+          "blue",
+          "trunk",
+          "green",
+          "primary",
+          "red",
+          "secondary",
+          "orange",
+          8947848
+        ]
+      },
+      "source":"shortbread",
+      "id":"roads",
+      "source-layer":"roads",
+      "type":"line",
+      "minzoom":10,
+      "maxzoom":13
+    }
+  ]
+}
diff --git a/spec/fixtures/basic_with_include.glug b/spec/fixtures/basic_with_include.glug
new file mode 100644
index 0000000..057ab79
--- /dev/null
+++ b/spec/fixtures/basic_with_include.glug
@@ -0,0 +1,5 @@
+version 8
+name 'My first stylesheet'
+source :shortbread, type: 'vector', url: 'https://vector.openstreetmap.org/shortbread_v1/tilejson.json'
+
+include_file('basic_with_include_sub.glug')
diff --git a/spec/fixtures/basic_with_include.json b/spec/fixtures/basic_with_include.json
new file mode 100644
index 0000000..b70b9fe
--- /dev/null
+++ b/spec/fixtures/basic_with_include.json
@@ -0,0 +1,36 @@
+{
+  "version":8,
+  "name":"My first stylesheet",
+  "sources":{
+    "shortbread":{
+      "type":"vector",
+      "url":"https://vector.openstreetmap.org/shortbread_v1/tilejson.json"
+    }
+  },
+  "layers":[
+    {
+      "paint":{
+        "line-width":6,
+        "line-color":[
+          "match",
+          ["get","highway"],
+          "motorway",
+          "blue",
+          "trunk",
+          "green",
+          "primary",
+          "red",
+          "secondary",
+          "orange",
+          8947848
+        ]
+      },
+      "source":"shortbread",
+      "id":"roads",
+      "source-layer":"roads",
+      "type":"line",
+      "minzoom":10,
+      "maxzoom":13
+    }
+  ]
+}
diff --git a/spec/fixtures/basic_with_include_sub.glug b/spec/fixtures/basic_with_include_sub.glug
new file mode 100644
index 0000000..4132843
--- /dev/null
+++ b/spec/fixtures/basic_with_include_sub.glug
@@ -0,0 +1,9 @@
+layer(:roads, zoom: 10..13, source: :shortbread) do
+  line_width 6
+  line_color match(highway,
+                   'motorway', :blue,
+                   'trunk', :green,
+                   'primary', :red,
+                   'secondary', :orange,
+                   0x888888)
+end
diff --git a/spec/lib/glug/stylesheet_spec.rb b/spec/lib/glug/stylesheet_spec.rb
index 18e7a73..c3654fc 100644
--- a/spec/lib/glug/stylesheet_spec.rb
+++ b/spec/lib/glug/stylesheet_spec.rb
@@ -65,4 +65,26 @@
     DOC
     .strip)
   end
+
+  context 'with fixtures' do
+    let!(:fixture_dir) { File.join(File.dirname(__FILE__), '../../fixtures/') }
+
+    it 'reads a basic file' do
+      glug = File.read(File.join(fixture_dir, 'basic.glug'))
+      stylesheet = described_class.new(base_dir: fixture_dir) do
+        instance_eval(glug)
+      end
+      output = File.read(File.join(fixture_dir, 'basic.json'))
+      expect(stylesheet.to_json).to eql(output.strip)
+    end
+
+    it 'handles include_file method calls' do
+      glug = File.read(File.join(fixture_dir, 'basic_with_include.glug'))
+      stylesheet = described_class.new(base_dir: fixture_dir) do
+        instance_eval(glug)
+      end
+      output = File.read(File.join(fixture_dir, 'basic_with_include.json'))
+      expect(stylesheet.to_json).to eql(output.strip)
+    end
+  end
 end