test: add unit test for get function

1 files changed, 37 insertions, 1 deletions

diff --git a/src/lib.rs b/src/lib.rs
index b90baa5..0a8333a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -446,7 +446,7 @@ struct CoolLayoutError;
 mod tests
 {
     use std::mem::offset_of;
-    use std::ptr::drop_in_place;
+    use std::ptr::{drop_in_place, NonNull};
 
     use crate::{Item, ItemFieldMetadata, ItemFieldSelection, MultiVec};
 
@@ -609,4 +609,40 @@ mod tests
             [654, u16::MAX / 7]
         );
     }
+
+    #[test]
+    fn get_works()
+    {
+        let mut multi_vec = MultiVec::<Foo>::new();
+
+        #[repr(packed)]
+        #[allow(dead_code)]
+        struct Data
+        {
+            num_a: [u32; 3],
+            num_b: [u16; 3],
+        }
+
+        let data = Data {
+            num_a: [u32::MAX - 3000, 901, 5560000],
+            num_b: [20210, 7120, 1010],
+        };
+
+        multi_vec.ptr = NonNull::from(&data).cast();
+        multi_vec.field_arr_byte_offsets = vec![0, size_of::<u32>() * 3];
+        multi_vec.length = 3;
+        multi_vec.capacity = 3;
+
+        assert_eq!(
+            multi_vec.get::<FooFieldNumA>(0).copied(),
+            Some(u32::MAX - 3000)
+        );
+        assert_eq!(multi_vec.get::<FooFieldNumB>(0).copied(), Some(20210));
+
+        assert_eq!(multi_vec.get::<FooFieldNumA>(1).copied(), Some(901));
+        assert_eq!(multi_vec.get::<FooFieldNumB>(1).copied(), Some(7120));
+
+        assert_eq!(multi_vec.get::<FooFieldNumA>(2).copied(), Some(5560000));
+        assert_eq!(multi_vec.get::<FooFieldNumB>(2).copied(), Some(1010));
+    }
 }