diff --git a/src/Builder.php b/src/Builder.php
new file mode 100644
index 0000000..094795d
--- /dev/null
+++ b/src/Builder.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace Opdavies\GmailFilterBuilder;
+
+class Builder
+{
+    private $filters = [];
+
+    public function __construct(array $filters) {
+        $this->filters = $filters;
+    }
+
+    public function build()
+    {
+    }
+}
diff --git a/tests/Unit/BuilderTest.php b/tests/Unit/BuilderTest.php
new file mode 100644
index 0000000..d8a83d0
--- /dev/null
+++ b/tests/Unit/BuilderTest.php
@@ -0,0 +1,39 @@
+<?php
+
+use Opdavies\GmailFilterBuilder\Builder;
+use Opdavies\GmailFilterBuilder\Filter;
+
+class BuilderTest extends \PHPUnit_Framework_TestCase
+{
+    public function testBuild()
+    {
+        $filterA = $this->getMockBuilder(Filter::class)
+            ->setMethods(['getProperties'])
+            ->getMock();
+
+        $filterB = $this->getMockBuilder(Filter::class)
+            ->setMethods(['getProperties'])
+            ->getMock();
+
+        $filterA->method('getProperties')
+            ->willReturn(
+                [
+                    ['from' => 'foo@example.com'],
+                    ['shouldStar' => true],
+                ]
+            );
+
+        $filterB->method('getProperties')
+            ->willReturn(
+                [
+                    ['to' => 'bar@example.com'],
+                ]
+            );
+
+        $builder = new Builder([
+            $filterA->getProperties(),
+            $filterB->getProperties(),
+        ]);
+        $builder->build();
+    }
+}
diff --git a/tests/Unit/FilterTest.php b/tests/Unit/FilterTest.php
index f9e9ee7..1dd3a1c 100644
--- a/tests/Unit/FilterTest.php
+++ b/tests/Unit/FilterTest.php
@@ -56,8 +56,7 @@ class FilterTest extends \PHPUnit_Framework_TestCase
         // Ensure that we can set multiple from addresses.
         $this->assertEquals(
             ['from' => ['foo@example.com', 'bar@example.com']],
-            $this->filter
-                ->from('foo@example.com', 'bar@example.com')
+            $this->filter->from('foo@example.com', 'bar@example.com')
                 ->getProperties()
         );
     }