page_count drops the last partial page: page_count(11, 5) returns 2 but should return 3. Please add a test.

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Timeline

1. planner iteration 1 ✓Finished 3 calls · 8,474 tokens · $0.0010 · 8.0s

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2. coder iteration 1 ✓Finished 3 calls · 15.4K tokens · $0.0017 · 10.8s

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3. tester iteration 1 ✓Finished 3 calls · 16.9K tokens · $0.0016 · 8.8s

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4. verify iteration 1 ✓Passed 0.3s

   running 5 tests
   test tests::exact_multiple ... ok
   test tests::no_overflow_near_max ... ok
   test tests::fewer_than_one_page ... ok
   test tests::partial_last_page ... ok
   test tests::zero_items ... ok
   
   test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
   
   
   running 8 tests
   test even_division ... ok
   test label ... ok
   test fewer_than_one_page ... ok
   test partial_label ... ok
   test partial_last_page ... ok
   test large_total_no_overflow ... ok
   test one_item_per_page ... ok
   test zero_items_no_pages ... ok
   
   test result: ok. 8 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
   
   
   running 0 tests
   
   test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
   
       Finished `test` profile [unoptimized] target(s) in 0.01s
        Running unittests src/lib.rs (.devswarm-target/debug/deps/buggy_rust-8b86c0ee2c25eb65)
        Running tests/pages.rs (.devswarm-target/debug/deps/pages-e0b59a8108228923)
      Doc-tests buggy_rust
   

5. reviewer iteration 1 ✓Finished 1 calls · 5,902 tokens · $0.0012 · 7.6s

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Final diff

diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..f25e053
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,16 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "buggy_rust"
+version = "0.1.0"
+dependencies = [
+ "itoa",
+]
+
+[[package]]
+name = "itoa"
+version = "1.0.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3bd1574e617a9a6c1f8f8181bd7e841e1f20e4277607ef28945765188d6284d4"
diff --git a/src/lib.rs b/src/lib.rs
index 23d2dd3..853f537 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,9 +1,40 @@
 /// How many pages are needed to show `total` items, `size` per page.
 pub fn page_count(total: u32, size: u32) -> u32 {
-    total / size
+    total / size + u32::from(total % size != 0)
 }
 
 /// The page count as text.
 pub fn page_label(total: u32, size: u32) -> String {
     itoa::Buffer::new().format(page_count(total, size)).to_string()
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn partial_last_page() {
+        assert_eq!(page_count(11, 5), 3);
+        assert_eq!(page_label(11, 5), "3");
+    }
+
+    #[test]
+    fn exact_multiple() {
+        assert_eq!(page_count(10, 5), 2);
+    }
+
+    #[test]
+    fn zero_items() {
+        assert_eq!(page_count(0, 5), 0);
+    }
+
+    #[test]
+    fn fewer_than_one_page() {
+        assert_eq!(page_count(3, 5), 1);
+    }
+
+    #[test]
+    fn no_overflow_near_max() {
+        assert_eq!(page_count(u32::MAX, 2), u32::MAX / 2 + 1);
+    }
+}
diff --git a/tests/pages.rs b/tests/pages.rs
index 39e3b10..40a7853 100644
--- a/tests/pages.rs
+++ b/tests/pages.rs
@@ -9,3 +9,34 @@ fn even_division() {
 fn label() {
     assert_eq!(page_label(10, 5), "2");
 }
+
+#[test]
+fn partial_last_page() {
+    assert_eq!(page_count(11, 5), 3);
+}
+
+#[test]
+fn partial_label() {
+    assert_eq!(page_label(11, 5), "3");
+}
+
+#[test]
+fn zero_items_no_pages() {
+    assert_eq!(page_count(0, 5), 0);
+}
+
+#[test]
+fn fewer_than_one_page() {
+    assert_eq!(page_count(3, 5), 1);
+}
+
+#[test]
+fn one_item_per_page() {
+    assert_eq!(page_count(7, 1), 7);
+}
+
+#[test]
+fn large_total_no_overflow() {
+    assert_eq!(page_count(u32::MAX, 2), u32::MAX / 2 + 1);
+    assert_eq!(page_count(u32::MAX, u32::MAX), 1);
+}