diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..f1ccb8b
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,23 @@
+on: [pull_request]
+
+name: CI
+
+jobs:
+  build_and_test:
+    name: Rust project
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+
+      - uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --release --all-features
+
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
\ No newline at end of file
diff --git a/src/geometry/basics/Plane.rs b/src/geometry/basics/Plane.rs
index 89708e4..212f2fb 100644
--- a/src/geometry/basics/Plane.rs
+++ b/src/geometry/basics/Plane.rs
@@ -65,7 +65,26 @@ impl PartialEq for Plane {
 
 #[cfg(test)]
 mod tests {
+    use super::*;
+
+    #[test]
+    fn is_valid()
+    {
+        // Invalids
+        assert!(!Plane::UNSET.is_valid());
+        assert!(!Plane::new(Point3d::INFINITY, Vector3d::INFINITY, Vector3d::INFINITY).is_valid());
+
+        // Valids
+        assert!(Plane::WORLDXY.is_valid());
+        assert!(Plane::WORLDYZ.is_valid());
+        assert!(Plane::WORLDZX.is_valid());
+    }
 
-
+    #[test]
+    fn cross_product()
+    {
+        let z = Plane::cross_product(Vector3d::XAXIS, Vector3d::YAXIS);
+        assert_eq!(z, Vector3d::ZAXIS);
+    }
 
 }
\ No newline at end of file
diff --git a/src/geometry/basics/Point3d.rs b/src/geometry/basics/Point3d.rs
index 1fdc020..ce53dd3 100644
--- a/src/geometry/basics/Point3d.rs
+++ b/src/geometry/basics/Point3d.rs
@@ -4,7 +4,7 @@ use std::ops;
 use crate::IsValid::IsValid;
 
 /// A Point in three-dimensional space
-#[derive(Copy, Clone)]
+#[derive(Copy, Clone, Debug)]
 pub struct Point3d
 {
     /// The X coordinate
diff --git a/src/geometry/basics/Vector3d.rs b/src/geometry/basics/Vector3d.rs
index e861bc5..0c0edd0 100644
--- a/src/geometry/basics/Vector3d.rs
+++ b/src/geometry/basics/Vector3d.rs
@@ -3,6 +3,7 @@ use std::ops;
 use crate::IsValid::IsValid;
 
 /// A Point in three-dimensional space
+#[derive(Copy, Clone, Debug)]
 pub struct Vector3d
 {
     /// The X coordinate
@@ -145,11 +146,6 @@ impl  IsValid for Vector3d {
     }
 }
 
-impl Clone for Vector3d {
-    fn clone(&self) -> Vector3d {
-        Vector3d::new(self.x, self.y, self.z)
-    }
-}
 
 impl PartialEq for Vector3d {
     fn eq(&self, other: &Self) -> bool {