diff --git a/position/src/lib.rs b/position/src/lib.rs
index 5776e05..d313231 100644
--- a/position/src/lib.rs
+++ b/position/src/lib.rs
@@ -13,7 +13,7 @@ mod sight;
 mod macros;
 
 #[macro_use]
-mod tests;
+mod testing;
 
 pub use position::{MoveBuilder as MakeMoveBuilder, Position, PositionBuilder};
 pub use r#move::{Castle, MakeMoveError, Move, MoveBuilder};
diff --git a/position/src/testing.rs b/position/src/testing.rs
new file mode 100644
index 0000000..ba4bd69
--- /dev/null
+++ b/position/src/testing.rs
@@ -0,0 +1,58 @@
+// Eryn Wells <eryn@erynwells.me>
+
+use crate::MakeMoveError;
+use chessfriend_moves::{BuildMoveError, BuildMoveResult, Move};
+
+#[macro_export]
+macro_rules! assert_move_list {
+    ($generated:expr, $expected:expr, $position:expr) => {
+        assert_eq!(
+            $generated,
+            $expected,
+            "\n\tMatching: {:?}\n\tGenerated, not expected: {:?}\n\tExpected, not generated: {:?}",
+            $generated
+                .intersection(&$expected)
+                .map(|mv| format!("{}", mv))
+                .collect::<Vec<String>>(),
+            $generated
+                .difference(&$expected)
+                .map(|mv| format!("{}", mv))
+                .collect::<Vec<String>>(),
+            $expected
+                .difference(&$generated)
+                .map(|mv| format!("{}", mv))
+                .collect::<Vec<String>>(),
+        )
+    };
+}
+
+#[macro_export]
+macro_rules! formatted_move_list {
+    ($move_list:expr, $position:expr) => {
+        $move_list
+            .iter()
+            .map(|mv| format!("{}", mv))
+            .collect::<Vec<String>>()
+    };
+}
+
+pub type TestResult = Result<(), TestError>;
+
+#[derive(Debug, Eq, PartialEq)]
+pub enum TestError {
+    BuildMove(BuildMoveError),
+    MakeMove(MakeMoveError),
+    NoLegalMoves,
+}
+
+impl From<BuildMoveError> for TestError {
+    fn from(value: BuildMoveError) -> Self {
+        TestError::BuildMove(value)
+    }
+}
+
+impl From<MakeMoveError> for TestError {
+    fn from(value: MakeMoveError) -> Self {
+        TestError::MakeMove(value)
+    }
+}
diff --git a/position/src/tests.rs b/position/src/tests.rs
deleted file mode 100644
index 962b9bc..0000000
--- a/position/src/tests.rs
+++ /dev/null
@@ -1,34 +0,0 @@
-// Eryn Wells <eryn@erynwells.me>
-
-#[macro_export]
-macro_rules! assert_move_list {
-    ($generated:expr, $expected:expr, $position:expr) => {
-        assert_eq!(
-            $generated,
-            $expected,
-            "Difference: {:?}",
-            $generated
-                .symmetric_difference(&$expected)
-                .map(|mv| format!(
-                    "{}",
-                    $crate::r#move::AlgebraicMoveFormatter::new(mv, &$position)
-                ))
-                .collect::<Vec<String>>()
-        )
-    };
-}
-
-#[macro_export]
-macro_rules! formatted_move_list {
-    ($move_list:expr, $position:expr) => {
-        $move_list
-            .iter()
-            .map(|mv| {
-                format!(
-                    "{}",
-                    $crate::r#move::AlgebraicMoveFormatter::new(mv, &$position)
-                )
-            })
-            .collect::<Vec<String>>()
-    };
-}