diff --git a/src/chart/types/preview_chart.rs b/src/chart/types/preview_chart.rs
index a6105314..5a48fca6 100644
--- a/src/chart/types/preview_chart.rs
+++ b/src/chart/types/preview_chart.rs
@@ -135,72 +135,3 @@ fn build_chart<DB: DrawingBackend>(
         let _ = chart.draw_series(area_series).log_err(location!());
     }
 }
-
-#[cfg(test)]
-mod tests {
-    use splines::{Interpolation, Key, Spline};
-
-    use crate::chart::types::chart_series::sample_spline;
-
-    #[test]
-    fn test_spline_samples() {
-        let vec = vec![
-            (0, -500),
-            (1, -1000),
-            (2, -1000),
-            (3, -1000),
-            (4, -1000),
-            (5, -1000),
-            (6, -1000),
-            (7, -1000),
-            (8, -1000),
-            (9, -1000),
-            (10, -1000),
-            (11, -1000),
-            (12, -1000),
-            (13, -1000),
-            (14, -1000),
-            (15, -1000),
-            (16, -1000),
-            (17, -1000),
-            (18, -1000),
-            (19, -1000),
-            (20, -1000),
-            (21, -1000),
-            (22, -1000),
-            (23, -1000),
-            (24, -1000),
-            (25, -1000),
-            (26, -1000),
-            (27, -1000),
-            (28, -1000),
-        ];
-        let spline = Spline::from_vec(
-            vec.iter()
-                .map(|&(x, y)| Key::new(x as f32, y as f32, Interpolation::Cosine))
-                .collect::<Vec<Key<f32, f32>>>(),
-        );
-
-        let eps = 0.001;
-
-        let pts = spline.len() * 10;
-        let samples = sample_spline(&spline, 1.0);
-        assert_eq!(samples.len(), pts);
-
-        let delta = samples[1].0 - samples[0].0;
-
-        assert_eq!(samples[0].0, 0.0);
-        assert_eq!(samples[0].1, -500.0);
-        for i in 0..pts - 1 {
-            assert_eq!(
-                (samples[i + 1].0 * 10_000.0 - samples[i].0 * 10_000.0).round() / 10_000.0,
-                (delta * 10_000.0).round() / 10_000.0
-            );
-            assert!(samples[i].1 <= -500.0);
-            assert!(samples[i].1 >= -1000.0 - eps);
-            assert!(samples[i + 1].1 < samples[i].1 + eps);
-        }
-        assert_eq!(samples[pts - 1].0, 28.0);
-        assert_eq!(samples[pts - 1].1, -1000.0);
-    }
-}