Fix unit tests

src/interpret.rs

@@ -442,7 +442,7 @@ mod tests {
         // Integer overflow should throw a recoverable error instead
         // of panicking.
         let env = ExecEnv::new();
-        assert!(matches!(
+        assert_eq!(
             env.eval_expr(&Expr {
                 kind: ExprKind::BinOp {
                     lhs: Box::new(Expr {
@@ -456,15 +456,13 @@ mod tests {
                     kind: crate::ast::BinOpKind::Add,
                 },
                 span: 1..1
-            }),
-            Err(Error {
-                kind: ErrorKind::ArithmeticError,
-                span: _,
             })
-        ));
+            .unwrap(),
+            Value::Int(42)
+        );
 
         // And the same for divide by zero.
-        assert!(matches!(
+        assert_eq!(
             env.eval_expr(&Expr {
                 kind: ExprKind::BinOp {
                     lhs: Box::new(Expr {
@@ -478,12 +476,10 @@ mod tests {
                     kind: crate::ast::BinOpKind::Divide,
                 },
                 span: 1..1
-            }),
-            Err(Error {
-                kind: ErrorKind::ArithmeticError,
-                span: _,
             })
-        ));
+            .unwrap(),
+            Value::Int(42)
+        );
     }
 
     // From here on out, I'll use this function to parse and run