fix precise note length, add test

src/compiler.rs

@@ -5,13 +5,20 @@ use std::{
     str::FromStr,
 };
 
+use cfg_if::cfg_if;
 use derive_new::new;
 use derive_wrapper::{AsRef, From};
 use fasteval::{Compiler as _, EvalNamespace, Evaler, Instruction, Slab};
 use lazy_static::lazy_static;
 use thiserror::Error;
 
-const SAMPLE_RATE: u16 = 48000;
+cfg_if! {
+    if #[cfg(test)] {
+        const SAMPLE_RATE: u16 = 10;
+    } else {
+        const SAMPLE_RATE: u16 = 48000;
+    }
+}
 
 #[derive(From, AsRef, Default)]
 #[cfg_attr(test, derive(Debug))]
@@ -383,19 +390,15 @@ impl Context {
         let curr_t = *self.get('t')?;
         if let Some(note) = n {
             let mut result = Vec::new();
-            while (self.current_length()? * SAMPLE_RATE as f64) > *self.get('t')? - curr_t {
-                {
-                    result.push(self.eval_with(&self.instrument, &mut {
             let mut map = self.namespace_generator();
             map.insert('n'.to_string(), note as f64);
-                        map
-                    })?);
-                }
+            while self.current_length()? > *self.get('t')? - curr_t + (1f64 / SAMPLE_RATE as f64) {
+                result.push(self.eval_with(&self.instrument, &mut map)?);
                 self.tick()?;
             }
             Ok(result)
         } else {
-            while (self.current_length()?) > *self.get('t')? - curr_t {
+            while self.current_length()? > *self.get('t')? - curr_t {
                 self.tick()?;
             }
             Ok(vec![
@@ -452,7 +455,6 @@ mod tests {
             [
                 ('a', 5.0),
                 ('t', 0.0),
-                ('n', 0.0),
                 ('N', 12.0),
                 ('L', 0.0),
                 ('l', 4.0),
@@ -501,4 +503,21 @@ mod tests {
         );
         Ok(())
     }
+
+    #[test]
+    fn reproducible_note() -> Result<(), CompilerError> {
+        let note = Note(3);
+        let mut compiler = Compiler::from(context_generator());
+
+        compiler = compiler.step(note)?;
+        let first = compiler.0.result.clone();
+
+        *compiler.0.get_mut('t')? = 0.0;
+        compiler.0.result.clear();
+        compiler = compiler.step(note)?;
+        let second = compiler.0.result.clone();
+
+        assert_eq!(first, second);
+        Ok(())
+    }
 }