Moddy the Tube test

src/bin/flat/tube/metric.rs

@@ -49,6 +49,12 @@ impl Metric for Tube {
 	}
 }
 
+#[cfg(test)]
+mod test {
+	use glam::{Vec2, vec2};
+	use crate::riemann::{Decomp2, Metric};
+	use super::Tube;
+
 	#[test]
 	fn test_tube_metric_derivs() {
 		struct Approx(Tube);
@@ -75,3 +81,4 @@ fn test_tube_metric_derivs() {
 			}
 		}
 	}
+}