diff --git a/src/sampler/char.rs b/src/convert/char.rs
similarity index 97%
rename from src/sampler/char.rs
rename to src/convert/char.rs
index 05de15b..3f2fbfe 100644
--- a/src/sampler/char.rs
+++ b/src/convert/char.rs
@@ -1,3 +1,4 @@
+#[cfg_attr(test, mockall::automock)]
 pub trait CharConverter {
     fn convert(&self, level: f32) -> char;
 }
diff --git a/src/sampler/color.rs b/src/convert/color.rs
similarity index 97%
rename from src/sampler/color.rs
rename to src/convert/color.rs
index 30d064e..94c5cbf 100644
--- a/src/sampler/color.rs
+++ b/src/convert/color.rs
@@ -1,5 +1,6 @@
 use crossterm::style::Color;
 
+#[cfg_attr(test, mockall::automock)]
 pub trait ColorConverter {
     fn convert(&self, level: f32) -> Color;
 }
diff --git a/src/sampler/level.rs b/src/convert/level.rs
similarity index 94%
rename from src/sampler/level.rs
rename to src/convert/level.rs
index d833903..72f5bca 100644
--- a/src/sampler/level.rs
+++ b/src/convert/level.rs
@@ -1,9 +1,11 @@
+#[derive(Copy, Clone, PartialEq, Debug)]
 pub enum Level {
     Keep,
     Draw(f32),
     Clear,
 }
 
+#[cfg_attr(test, mockall::automock)]
 pub trait LevelConverter {
     fn convert(&self, level: f32) -> Level;
 }
diff --git a/src/convert/mod.rs b/src/convert/mod.rs
new file mode 100644
index 0000000..87d0616
--- /dev/null
+++ b/src/convert/mod.rs
@@ -0,0 +1,96 @@
+use crate::convert::char::CharConverter;
+use crate::convert::color::ColorConverter;
+use crate::convert::level::{Level, LevelConverter};
+use crossterm::style::Color;
+
+mod char;
+mod color;
+mod level;
+
+pub trait Converter {
+    fn char(&self, level: f32) -> char;
+    fn color(&self, level: f32) -> Color;
+    fn level(&self, level: f32) -> Level;
+}
+
+pub struct ConverterImpl<T1, T2, T3> {
+    char: T1,
+    color: T2,
+    level: T3,
+}
+
+impl<T1, T2, T3> ConverterImpl<T1, T2, T3> {
+    pub fn new(char: T1, color: T2, level: T3) -> Self {
+        Self { char, color, level }
+    }
+}
+
+impl<T1: CharConverter, T2: ColorConverter, T3: LevelConverter> Converter
+    for ConverterImpl<T1, T2, T3>
+{
+    fn char(&self, level: f32) -> char {
+        self.char.convert(level)
+    }
+
+    fn color(&self, level: f32) -> Color {
+        self.color.convert(level)
+    }
+
+    fn level(&self, level: f32) -> Level {
+        self.level.convert(level)
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::convert::char::MockCharConverter;
+    use crate::convert::color::MockColorConverter;
+    use crate::convert::level::MockLevelConverter;
+    use mockall::predicate::eq;
+
+    #[test]
+    fn char() {
+        let mut char = MockCharConverter::new();
+        let color = MockColorConverter::new();
+        let level = MockLevelConverter::new();
+
+        char.expect_convert().with(eq(4.0)).return_const('M');
+
+        let converter = ConverterImpl::new(char, color, level);
+
+        assert_eq!('M', converter.char(4.0));
+    }
+
+    #[test]
+    fn color() {
+        let char = MockCharConverter::new();
+        let mut color = MockColorConverter::new();
+        let level = MockLevelConverter::new();
+
+        color
+            .expect_convert()
+            .with(eq(2.0))
+            .return_const(Color::Yellow);
+
+        let converter = ConverterImpl::new(char, color, level);
+
+        assert_eq!(Color::Yellow, converter.color(2.0));
+    }
+
+    #[test]
+    fn level() {
+        let char = MockCharConverter::new();
+        let color = MockColorConverter::new();
+        let mut level = MockLevelConverter::new();
+
+        level
+            .expect_convert()
+            .with(eq(3.0))
+            .return_const(Level::Draw(2.0));
+
+        let converter = ConverterImpl::new(char, color, level);
+
+        assert_eq!(Level::Draw(2.0), converter.level(3.0));
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 10a4973..d1ae43b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,7 @@
 pub mod error;
 pub mod pattern;
 pub mod printer;
-pub mod sampler;
+pub mod convert;
 pub mod term;
 mod vec;
 
diff --git a/src/sampler/mod.rs b/src/sampler/mod.rs
deleted file mode 100644
index a521828..0000000
--- a/src/sampler/mod.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-mod color;
-mod level;
-mod char;