refactor: create submodules for tests

src/nodes/eval.rs

@@ -192,12 +192,13 @@ impl Function {
 }
 
 #[cfg(test)]
-use super::PREC;
-#[cfg(test)]
+mod tests {
+    use super::super::PREC;
+    use super::*;
     use std::assert_matches;
 
     #[test]
-fn test() {
+    fn basic() {
         assert_eq!(
             Nodes(vec![
                 Node::Function(Function::Sine),
@@ -215,9 +216,10 @@ fn test() {
     }
 
     #[test]
-fn test_zerosized() {
+    fn zerosized() {
         assert_matches!(
             Nodes(vec![Node::ParenthesisStart, Node::ParenthesisEnd]).evaluate(),
             Err(Error::CollapseFailed(Nodes(v))) if v.is_empty()
         )
     }
+}

src/nodes/parse.rs

@@ -195,8 +195,12 @@ impl FromStr for Nodes {
     }
 }
 
+#[cfg(test)]
+mod tests {
+    use super::*;
+
     #[test]
-fn test() {
+    fn basic() {
         assert_eq!(
             Nodes::from_str("sin(2) + 1").unwrap().as_ref(),
             &[
@@ -209,8 +213,9 @@ fn test() {
             ],
         )
     }
+
     #[test]
-fn test_e() {
+    fn e_constant() {
         assert_eq!(
             Nodes::from_str("5e * 5").unwrap().as_ref(),
             &[
@@ -223,7 +228,7 @@ fn test_e() {
         )
     }
     #[test]
-fn test_unary_op() {
+    fn unary_op() {
         assert_eq!(
             Nodes::from_str("5(-5)").unwrap().as_ref(),
             &[
@@ -235,3 +240,4 @@ fn test_unary_op() {
             ],
         )
     }
+}