Add variation tests.

src/mfvi.rs

@@ -194,3 +194,83 @@ pub fn select_variant<'i>(input: &'i str, var: &'i Variant) -> String {
 
     output
 }
+
+#[cfg(test)]
+mod test {
+    use super::SfxMode;
+
+    const INPUT: &'static str = "
+#VARIANT ~
+#VARIANT _ tr
+#SFXV ` *
+
+#WAVE 0x20 0x62 violins
+#WAVE 0x21 0x63 violas
+#WAVE 0x22 ~0x01~ _0x09_ piano high
+#WAVE 0x23 0x02 piano mid
+#WAVE 0x24 0x07 piano lo-mid
+#WAVE 0x25 0x04 piano low
+##WAVE 0x26 0x06 piano x-high
+#WAVE 0x27 0x75 vox
+#WAVE 0x28 0x7E horn
+#WAVE 0x29 0x92 oboe
+";
+
+    #[test]
+    fn default_variant() {
+        let vlist = super::get_variants(INPUT, SfxMode::Off);
+        let def = vlist
+            .get("_default_")
+            .expect("_default_ variant always exists");
+
+        let variation = super::select_variant(INPUT, def);
+        assert_eq!(
+            variation,
+            "
+#VARIANT 
+#VARIANT _ tr
+#SFXV ` *
+
+#WAVE 0x20 0x62 violins
+#WAVE 0x21 0x63 violas
+#WAVE 0x22 0x01  piano high
+#WAVE 0x23 0x02 piano mid
+#WAVE 0x24 0x07 piano lo-mid
+#WAVE 0x25 0x04 piano low
+##WAVE 0x26 0x06 piano x-high
+#WAVE 0x27 0x75 vox
+#WAVE 0x28 0x7E horn
+#WAVE 0x29 0x92 oboe
+"
+        );
+    }
+
+    #[test]
+    fn tr_variant() {
+        let vlist = super::get_variants(INPUT, SfxMode::Off);
+        let tr = vlist
+            .get("tr")
+            .expect("tr variant is in input");
+
+        let variation = super::select_variant(INPUT, tr);
+        assert_eq!(
+            variation,
+            "
+#VARIANT ~
+#VARIANT  tr
+#SFXV ` *
+
+#WAVE 0x20 0x62 violins
+#WAVE 0x21 0x63 violas
+#WAVE 0x22  0x09 piano high
+#WAVE 0x23 0x02 piano mid
+#WAVE 0x24 0x07 piano lo-mid
+#WAVE 0x25 0x04 piano low
+##WAVE 0x26 0x06 piano x-high
+#WAVE 0x27 0x75 vox
+#WAVE 0x28 0x7E horn
+#WAVE 0x29 0x92 oboe
+"
+        );
+    }
+}