add drop table init test

src/ship/drops/mod.rs

@@ -174,3 +174,22 @@ impl<R: Rng + SeedableRng> DropTable<R> {
         self.box_table.get_drop(map_area, object, &mut self.rng)
     }
 }
+
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use rand::seq::IteratorRandom;
+
+    #[test]
+    fn test_initializing_drop_table() {
+        let mut rng = rand_chacha::ChaCha20Rng::from_entropy();
+        let episode = vec![Episode::One, Episode::Two].into_iter().choose(&mut rng).unwrap();
+        let difficulty = vec![Difficulty::Normal, Difficulty::Hard, Difficulty::VeryHard, Difficulty::Ultimate]
+            .into_iter().choose(&mut rng).unwrap();
+        let section_id = vec![SectionID::Viridia, SectionID::Greenill, SectionID::Skyly, SectionID::Bluefull, SectionID::Purplenum,
+                              SectionID::Pinkal, SectionID::Redria, SectionID::Oran, SectionID::Yellowboze, SectionID::Whitill]
+            .into_iter().choose(&mut rng).unwrap();
+        DropTable::<rand_chacha::ChaCha20Rng>::new(episode, difficulty, section_id);
+    }
+}