From 13d4ff167880c5c46f9373c7e75b69cb68da42d8 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Tue, 27 Aug 2024 19:24:43 +0200
Subject: test: add push function unit tests

---
 src/lib.rs | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 83 insertions(+), 4 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 228b7e1..8bfcd29 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -518,16 +518,95 @@ mod tests
     }
 
     #[test]
-    fn works()
+    fn single_push_works()
     {
         let mut multi_vec = MultiVec::<Foo>::new();
 
         multi_vec.push(Foo { num_a: 123, num_b: 654 });
 
-        multi_vec.push(Foo { num_a: 12338, num_b: 191 });
+        assert_eq!(multi_vec.capacity, 1);
+        assert_eq!(multi_vec.length, 1);
 
-        let item = multi_vec.get::<FooFieldNumA>(1).unwrap();
+        assert_eq!(multi_vec.field_arr_byte_offsets, [0, size_of::<u32>()]);
 
-        println!("yay: {}", *item);
+        assert_eq!(
+            unsafe {
+                std::slice::from_raw_parts::<u32>(multi_vec.ptr.as_ptr().cast(), 1)
+            },
+            [123]
+        );
+
+        assert_eq!(
+            unsafe {
+                std::slice::from_raw_parts::<u16>(
+                    multi_vec.ptr.as_ptr().byte_add(size_of::<u32>()).cast(),
+                    1,
+                )
+            },
+            [654]
+        );
+    }
+
+    #[test]
+    fn multiple_pushes_works()
+    {
+        let mut multi_vec = MultiVec::<Foo>::new();
+
+        multi_vec.push(Foo { num_a: u32::MAX / 2, num_b: 654 });
+        multi_vec.push(Foo { num_a: 765, num_b: u16::MAX / 3 });
+        multi_vec.push(Foo { num_a: u32::MAX / 5, num_b: 337 });
+
+        assert_eq!(multi_vec.capacity, 4);
+        assert_eq!(multi_vec.length, 3);
+
+        assert_eq!(multi_vec.field_arr_byte_offsets, [0, size_of::<u32>() * 4]);
+
+        assert_eq!(
+            unsafe {
+                std::slice::from_raw_parts::<u32>(multi_vec.ptr.as_ptr().cast(), 3)
+            },
+            [u32::MAX / 2, 765, u32::MAX / 5]
+        );
+
+        assert_eq!(
+            unsafe {
+                std::slice::from_raw_parts::<u16>(
+                    multi_vec.ptr.as_ptr().byte_add(size_of::<u32>() * 4).cast(),
+                    3,
+                )
+            },
+            [654, u16::MAX / 3, 337]
+        );
+    }
+
+    #[test]
+    fn multiple_pushes_in_preallocated_works()
+    {
+        let mut multi_vec = MultiVec::<Foo>::with_capacity(2);
+
+        multi_vec.push(Foo { num_a: 83710000, num_b: 654 });
+        multi_vec.push(Foo { num_a: 765, num_b: u16::MAX / 7 });
+
+        assert_eq!(multi_vec.capacity, 2);
+        assert_eq!(multi_vec.length, 2);
+
+        assert_eq!(multi_vec.field_arr_byte_offsets, [0, size_of::<u32>() * 2]);
+
+        assert_eq!(
+            unsafe {
+                std::slice::from_raw_parts::<u32>(multi_vec.ptr.as_ptr().cast(), 2)
+            },
+            [83710000, 765]
+        );
+
+        assert_eq!(
+            unsafe {
+                std::slice::from_raw_parts::<u16>(
+                    multi_vec.ptr.as_ptr().byte_add(size_of::<u32>() * 2).cast(),
+                    2,
+                )
+            },
+            [654, u16::MAX / 7]
+        );
     }
 }
-- 
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