diff --git a/crates/fj-kernel/src/algorithms/sweep/face.rs b/crates/fj-kernel/src/algorithms/sweep/face.rs
index 638df01ae..1c44e542f 100644
--- a/crates/fj-kernel/src/algorithms/sweep/face.rs
+++ b/crates/fj-kernel/src/algorithms/sweep/face.rs
@@ -75,3 +75,87 @@ fn create_top_face(
 
     face
 }
+
+#[cfg(test)]
+mod tests {
+    use fj_interop::mesh::Color;
+
+    use crate::{
+        algorithms::{reverse::Reverse, transform::TransformObject},
+        objects::{Face, HalfEdge, Sketch, Surface},
+    };
+
+    use super::Sweep;
+
+    const TRIANGLE: [[f64; 2]; 3] = [[0., 0.], [1., 0.], [0., 1.]];
+
+    const UP: [f64; 3] = [0., 0., 1.];
+    const DOWN: [f64; 3] = [0., 0., -1.];
+
+    #[test]
+    fn sweep_up() {
+        let surface = Surface::xy_plane();
+        let solid = Sketch::build(surface)
+            .polygon_from_points(TRIANGLE)
+            .sweep(UP);
+
+        let bottom = Face::build(surface)
+            .polygon_from_points(TRIANGLE)
+            .into_face()
+            .reverse();
+        let top = Face::build(surface.translate(UP))
+            .polygon_from_points(TRIANGLE)
+            .into_face();
+
+        assert!(solid.find_face(&bottom).is_some());
+        assert!(solid.find_face(&top).is_some());
+
+        let mut side_faces = TRIANGLE.windows(2).map(|window| {
+            // Can't panic, as we passed `2` to `windows`.
+            //
+            // Can be cleaned up, once `array_windows` is stable:
+            // https://doc.rust-lang.org/std/primitive.slice.html#method.array_windows
+            let [a, b] = [window[0], window[1]];
+
+            let half_edge = HalfEdge::build(Surface::xy_plane())
+                .line_segment_from_points([a, b]);
+            (half_edge, Color::default()).sweep(UP)
+        });
+
+        assert!(side_faces.all(|face| solid.find_face(&face).is_some()));
+    }
+
+    #[test]
+    fn sweep_down() {
+        let surface = Surface::xy_plane();
+        let solid = Sketch::build(surface)
+            .polygon_from_points(TRIANGLE)
+            .sweep(DOWN);
+
+        let bottom = Face::build(surface.translate(DOWN))
+            .polygon_from_points(TRIANGLE)
+            .into_face()
+            .reverse();
+        let top = Face::build(surface)
+            .polygon_from_points(TRIANGLE)
+            .into_face();
+
+        assert!(solid.find_face(&bottom).is_some());
+        assert!(solid.find_face(&top).is_some());
+
+        let mut side_faces = TRIANGLE.windows(2).map(|window| {
+            // Can't panic, as we passed `2` to `windows`.
+            //
+            // Can be cleaned up, once `array_windows` is stable:
+            // https://doc.rust-lang.org/std/primitive.slice.html#method.array_windows
+            let [a, b] = [window[0], window[1]];
+
+            let half_edge = HalfEdge::build(Surface::xy_plane())
+                .line_segment_from_points([a, b])
+                .reverse();
+            (half_edge, Color::default()).sweep(DOWN)
+        });
+
+        assert!(side_faces.all(|face| solid.find_face(&face).is_some()));
+    }
+}
diff --git a/crates/fj-kernel/src/algorithms/sweep/sketch.rs b/crates/fj-kernel/src/algorithms/sweep/sketch.rs
index 6c32798ed..143f2baf3 100644
--- a/crates/fj-kernel/src/algorithms/sweep/sketch.rs
+++ b/crates/fj-kernel/src/algorithms/sweep/sketch.rs
@@ -19,153 +19,3 @@ impl Sweep for Sketch {
         Solid::new().with_shells(shells)
     }
 }
-
-#[cfg(test)]
-mod tests {
-    use fj_math::{Point, Vector};
-
-    use crate::{
-        iter::ObjectIters,
-        objects::{Face, Sketch, Surface},
-    };
-
-    use super::Sweep;
-
-    // This test currently fails, even though the code it tests works correctly.
-    // Fixing this would require this whole test suite to be refactored.
-    //
-    // Since other tests have already been disabled before, diminishing the
-    // value of this test suite significantly, it's not a big loss to disable
-    // this rather simple test too, and fix the whole test suite at a later
-    // date.
-    #[test]
-    #[ignore]
-    fn bottom_positive() -> anyhow::Result<()> {
-        test_bottom_top(
-            [0., 0., 1.],
-            [[0., 0., 0.], [1., 0., 0.], [0., -1., 0.]],
-            [[0., 0.], [1., 0.], [0., -1.]],
-        )
-    }
-
-    #[test]
-    fn bottom_negative() -> anyhow::Result<()> {
-        test_bottom_top(
-            [0., 0., -1.],
-            [[0., 0., 0.], [1., 0., 0.], [0., 1., 0.]],
-            [[0., 0.], [1., 0.], [0., 1.]],
-        )
-    }
-
-    #[test]
-    fn top_positive() -> anyhow::Result<()> {
-        test_bottom_top(
-            [0., 0., 1.],
-            [[0., 0., 1.], [1., 0., 1.], [0., 1., 1.]],
-            [[0., 0.], [1., 0.], [0., 1.]],
-        )
-    }
-
-    // This test currently fails, even though the code it tests works correctly.
-    // Fixing this would require this whole test suite to be refactored.
-    //
-    // Since other tests have already been disabled before, diminishing the
-    // value of this test suite significantly, it's not a big loss to disable
-    // this rather simple test too, and fix the whole test suite at a later
-    // date.
-    #[test]
-    #[ignore]
-    fn top_negative() -> anyhow::Result<()> {
-        test_bottom_top(
-            [0., 0., -1.],
-            [[0., 0., -1.], [1., 0., -1.], [0., -1., -1.]],
-            [[0., 0.], [1., 0.], [0., -1.]],
-        )
-    }
-
-    // This test currently fails, even though the code it tests works correctly.
-    // At the time this test was disabled, fixing it would have been
-    // impractical. This has changed since then, thanks to some simplifications.
-    #[test]
-    #[ignore]
-    fn side_positive() -> anyhow::Result<()> {
-        test_side(
-            [0., 0., 1.],
-            [
-                [[0., 0., 0.], [1., 0., 0.], [0., 0., 1.]],
-                [[1., 0., 0.], [0., 1., 0.], [1., 0., 1.]],
-                [[0., 1., 0.], [0., 0., 0.], [0., 1., 1.]],
-            ],
-        )
-    }
-
-    // This test currently fails, even though the code it tests works correctly.
-    // At the time this test was disabled, fixing it would have been
-    // impractical. This has changed since then, thanks to some simplifications.
-    #[test]
-    #[ignore]
-    fn side_negative() -> anyhow::Result<()> {
-        test_side(
-            [0., 0., -1.],
-            [
-                [[0., 0., 0.], [0., 1., 0.], [0., 0., -1.]],
-                [[0., 1., 0.], [1., 0., 0.], [0., 1., -1.]],
-                [[1., 0., 0.], [0., 0., 0.], [1., 0., -1.]],
-            ],
-        )
-    }
-
-    fn test_side(
-        direction: impl Into<Vector<3>>,
-        expected_surfaces: [[impl Into<Point<3>>; 3]; 3],
-    ) -> anyhow::Result<()> {
-        test(
-            direction,
-            expected_surfaces,
-            [[0., 0.], [1., 0.], [1., 1.], [0., 1.]],
-        )
-    }
-
-    fn test_bottom_top(
-        direction: impl Into<Vector<3>>,
-        expected_surface: [impl Into<Point<3>>; 3],
-        expected_vertices: [impl Into<Point<2>>; 3],
-    ) -> anyhow::Result<()> {
-        test(direction, [expected_surface], expected_vertices)
-    }
-
-    fn test(
-        direction: impl Into<Vector<3>>,
-        expected_surfaces: impl IntoIterator<Item = [impl Into<Point<3>>; 3]>,
-        expected_vertices: impl IntoIterator<Item = impl Into<Point<2>>>,
-    ) -> anyhow::Result<()> {
-        let surface = Surface::xy_plane();
-        let face = Face::build(surface).polygon_from_points([
-            [0., 0.],
-            [1., 0.],
-            [0., 1.],
-        ]);
-        let sketch = Sketch::new().with_faces([face]);
-
-        let solid = sketch.sweep(direction);
-
-        let expected_vertices: Vec<_> = expected_vertices
-            .into_iter()
-            .map(|vertex| vertex.into())
-            .collect();
-
-        let faces = expected_surfaces.into_iter().map(|surface| {
-            let surface = Surface::plane_from_points(surface);
-
-            Face::build(surface)
-                .polygon_from_points(expected_vertices.clone())
-                .into_face()
-        });
-
-        for face in faces {
-            assert!(solid.face_iter().any(|f| f == &face));
-        }
-
-        Ok(())
-    }
-}