Move unit tests into separate file.

src/tests.rs

@@ -0,0 +1,39 @@
+//! Module containing unit tests.
+#![cfg(test)]
+
+/// This test is to make sure no code changes increase the sizes of critical data structures.
+#[test]
+fn check_struct_sizes() {
+    use crate::*;
+    use std::mem::size_of;
+
+    const PACKED: bool = cfg!(all(
+        target_pointer_width = "32",
+        feature = "only_i32",
+        feature = "no_float"
+    ));
+
+    assert_eq!(size_of::<Dynamic>(), if PACKED { 8 } else { 16 });
+    assert_eq!(size_of::<Option<Dynamic>>(), if PACKED { 8 } else { 16 });
+    #[cfg(not(feature = "no_position"))]
+    assert_eq!(size_of::<Position>(), 4);
+    assert_eq!(size_of::<ast::Expr>(), 16);
+    assert_eq!(size_of::<Option<ast::Expr>>(), 16);
+    assert_eq!(size_of::<ast::Stmt>(), 32);
+    assert_eq!(size_of::<Option<ast::Stmt>>(), 32);
+    assert_eq!(
+        size_of::<FnPtr>(),
+        if cfg!(feature = "no_smartstring") {
+            80
+        } else {
+            96
+        }
+    );
+    assert_eq!(size_of::<Scope>(), 464);
+    assert_eq!(size_of::<LexError>(), 56);
+    assert_eq!(
+        size_of::<ParseError>(),
+        if cfg!(feature = "no_position") { 8 } else { 16 }
+    );
+    assert_eq!(size_of::<EvalAltResult>(), 72);
+}