test: added tests

tests/perf_via_diff.rs

@@ -0,0 +1,73 @@
+#![cfg(not(any(feature = "async_tokio", feature = "async_std")))]
+
+use rosu_pp::{CatchPP, ManiaPP, OsuPP, TaikoPP};
+
+mod common;
+
+#[test]
+fn osu() {
+    let map = test_map!(Osu);
+
+    let mods = 8 + 64;
+    let misses = 2;
+
+    let regular = OsuPP::new(map).mods(mods).n_misses(misses).calculate();
+
+    let via_diff = OsuPP::from(regular.difficulty.clone())
+        .mods(mods)
+        .n_misses(misses)
+        .calculate();
+
+    assert_eq!(regular, via_diff);
+}
+
+#[test]
+fn taiko() {
+    let map = test_map!(Taiko);
+
+    let mods = 8 + 64;
+    let misses = 2;
+
+    let regular = TaikoPP::new(map).mods(mods).n_misses(misses).calculate();
+
+    let via_diff = TaikoPP::from(regular.difficulty.clone())
+        .mods(mods)
+        .n_misses(misses)
+        .calculate();
+
+    assert_eq!(regular, via_diff);
+}
+
+#[test]
+fn catch() {
+    let map = test_map!(Catch);
+
+    let mods = 8 + 64;
+    let misses = 2;
+
+    let regular = CatchPP::new(map).mods(mods).misses(misses).calculate();
+
+    let via_diff = CatchPP::from(regular.difficulty.clone())
+        .mods(mods)
+        .misses(misses)
+        .calculate();
+
+    assert_eq!(regular, via_diff);
+}
+
+#[test]
+fn mania() {
+    let map = test_map!(Mania);
+
+    let mods = 8 + 64;
+    let misses = 2;
+
+    let regular = ManiaPP::new(map).mods(mods).n_misses(misses).calculate();
+
+    let via_diff = ManiaPP::from(regular.difficulty.clone())
+        .mods(mods)
+        .n_misses(misses)
+        .calculate();
+
+    assert_eq!(regular, via_diff);
+}