diff --git a/src/pattern/circle.rs b/src/pattern/circle.rs
index c5abcbb..8db31aa 100644
--- a/src/pattern/circle.rs
+++ b/src/pattern/circle.rs
@@ -40,7 +40,7 @@ mod test {
             size: Vector::new(10.0, 20.0),
             step: 0.0,
         };
-        let pattern = Circle::new(&config);
+        let pattern = CircleFactory::default().create(&config);
 
         assert_abs_diff_eq!(1.0, pattern.sample(Vector::new(0.0, 0.0)), epsilon = 0.1);
         assert_abs_diff_eq!(0.0, pattern.sample(Vector::new(5.0, 10.0)), epsilon = 0.1);
diff --git a/src/pattern/line.rs b/src/pattern/line.rs
index 409faeb..c9d30d9 100644
--- a/src/pattern/line.rs
+++ b/src/pattern/line.rs
@@ -38,7 +38,7 @@ mod test {
             size: Vector::new(20.0, 0.0),
             step: 0.0,
         };
-        let pattern = Line::new(&config);
+        let pattern = LineFactory::default().create(&config);
 
         assert_abs_diff_eq!(0.0, pattern.sample(Vector::new(0.0, 4.0)), epsilon = 0.1);
         assert_abs_diff_eq!(0.4, pattern.sample(Vector::new(8.0, 8.0)), epsilon = 0.1);
diff --git a/src/pattern/mod.rs b/src/pattern/mod.rs
index 96b1b77..6ea9489 100644
--- a/src/pattern/mod.rs
+++ b/src/pattern/mod.rs
@@ -73,6 +73,7 @@ impl Sampler for SamplerImpl {
 #[cfg(test)]
 mod test {
     use super::*;
+    use approx::*;
     use mockall::predicate::eq;
 
     #[test]
@@ -86,7 +87,7 @@ mod test {
 
         let sampler = SamplerImpl::new(Box::new(char), Box::new(color));
 
-        assert_eq!(2.5, sampler.char(Vector::new(2.0, 5.0)));
+        assert_abs_diff_eq!(2.5, sampler.char(Vector::new(2.0, 5.0)));
     }
 
     #[test]
@@ -101,6 +102,37 @@ mod test {
 
         let sampler = SamplerImpl::new(Box::new(char), Box::new(color));
 
-        assert_eq!(3.2, sampler.color(Vector::new(4.0, 2.0)));
+        assert_abs_diff_eq!(3.2, sampler.color(Vector::new(4.0, 2.0)));
+    }
+
+    #[test]
+    fn factory() {
+        let mut char = MockPatternFactory::new();
+        let mut color = MockPatternFactory::new();
+        let config = Config {
+            size: Vector::new(2.0, 3.0),
+            step: 0.6,
+        };
+
+        char.expect_create().with(eq(config)).once().returning(|_| {
+            let mut sampler = MockPattern::new();
+            sampler.expect_sample().return_const(3.0);
+            Box::new(sampler)
+        });
+        color
+            .expect_create()
+            .with(eq(config))
+            .once()
+            .returning(|_| {
+                let mut sampler = MockPattern::new();
+                sampler.expect_sample().return_const(5.0);
+                Box::new(sampler)
+            });
+
+        let factory = SamplerFactoryImpl::new(Box::new(char), Box::new(color));
+        let sampler = factory.create(&config);
+
+        assert_abs_diff_eq!(3.0, sampler.char(Vector::default()));
+        assert_abs_diff_eq!(5.0, sampler.color(Vector::default()));
     }
 }
diff --git a/src/pattern/rhombus.rs b/src/pattern/rhombus.rs
index aaa019e..4a79f59 100644
--- a/src/pattern/rhombus.rs
+++ b/src/pattern/rhombus.rs
@@ -40,7 +40,7 @@ mod test {
             size: Vector::new(10.0, 5.0),
             step: 0.0,
         };
-        let pattern = Rhombus::new(&config);
+        let pattern = RhombusFactory::default().create(&config);
 
         assert_abs_diff_eq!(1.0, pattern.sample(Vector::new(0.0, 0.0)), epsilon = 0.1);
         assert_abs_diff_eq!(1.0, pattern.sample(Vector::new(10.0, 5.0)), epsilon = 0.1);
diff --git a/src/pattern/wheel.rs b/src/pattern/wheel.rs
index b205276..c211d18 100644
--- a/src/pattern/wheel.rs
+++ b/src/pattern/wheel.rs
@@ -39,7 +39,7 @@ mod test {
             size: Vector::new(10.0, 20.0),
             step: 0.0,
         };
-        let pattern = Wheel::new(&config);
+        let pattern = WheelFactory::default().create(&config);
 
         assert_abs_diff_eq!(0.0, pattern.sample(Vector::new(0.0, 9.0)), epsilon = 0.1);
         assert_abs_diff_eq!(1.0, pattern.sample(Vector::new(0.0, 10.0)), epsilon = 0.1);