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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1. planner iteration 1 ✓Finished 3 calls · 8,504 tokens · $0.0009 · 9.1s

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2. coder iteration 1 ✓Finished 5 calls · 22.0K tokens · $0.0011 · 9.1s

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3. tester iteration 1 ✓Finished 3 calls · 18.1K tokens · $0.0017 · 12.6s

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4. verify iteration 1 ✓Passed 0.3s

   running 0 tests
   
   test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
   
   
   running 5 tests
   test just_over_and_under_a_boundary ... ok
   test size_one_and_size_equal_total ... ok
   test total_near_u32_max_does_not_overflow ... ok
   test zero_size_still_panics - should panic ... ok
   test label_for_partial_pages ... ok
   
   test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
   
   
   running 4 tests
   test label ... ok
   test even_division ... ok
   test partial_last_page_is_counted ... ok
   test small_and_empty_totals ... ok
   
   test result: ok. 4 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 + debuginfo] target(s) in 0.01s
        Running unittests src/lib.rs (.devswarm-target/debug/deps/buggy_rust-ab4c16c0511cb6e4)
        Running tests/page_count_edges.rs (.devswarm-target/debug/deps/page_count_edges-5c080dba5de03054)
        Running tests/pages.rs (.devswarm-target/debug/deps/pages-12028afce8a77fe7)
      Doc-tests buggy_rust
   

5. reviewer iteration 1 ✓Finished 2 calls · 12.0K tokens · $0.0012 · 8.1s

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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..40cd602 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,6 @@
 /// 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.
diff --git a/tests/page_count_edges.rs b/tests/page_count_edges.rs
new file mode 100644
index 0000000..ab8b60d
--- /dev/null
+++ b/tests/page_count_edges.rs
@@ -0,0 +1,39 @@
+use buggy_rust::{page_count, page_label};
+
+#[test]
+fn just_over_and_under_a_boundary() {
+    assert_eq!(page_count(5, 5), 1);
+    assert_eq!(page_count(6, 5), 2);
+    assert_eq!(page_count(4, 5), 1);
+    assert_eq!(page_count(9, 5), 2);
+}
+
+#[test]
+fn size_one_and_size_equal_total() {
+    assert_eq!(page_count(7, 1), 7);
+    assert_eq!(page_count(7, 7), 1);
+    assert_eq!(page_count(1, 1), 1);
+}
+
+#[test]
+fn total_near_u32_max_does_not_overflow() {
+    // u32::MAX = 4294967295 = 5 * 858993459 exactly
+    assert_eq!(page_count(u32::MAX, 5), 858_993_459);
+    assert_eq!(page_count(u32::MAX, 1), u32::MAX);
+    assert_eq!(page_count(u32::MAX, u32::MAX), 1);
+    // odd total with size 2 needs a partial page: 2147483647 full pages + 1
+    assert_eq!(page_count(u32::MAX, 2), 2_147_483_648);
+}
+
+#[test]
+fn label_for_partial_pages() {
+    assert_eq!(page_label(6, 5), "2");
+    assert_eq!(page_label(1, 5), "1");
+    assert_eq!(page_label(0, 5), "0");
+}
+
+#[test]
+#[should_panic]
+fn zero_size_still_panics() {
+    let _ = page_count(10, 0);
+}
diff --git a/tests/pages.rs b/tests/pages.rs
index 39e3b10..115c8c3 100644
--- a/tests/pages.rs
+++ b/tests/pages.rs
@@ -9,3 +9,15 @@ fn even_division() {
 fn label() {
     assert_eq!(page_label(10, 5), "2");
 }
+
+#[test]
+fn partial_last_page_is_counted() {
+    assert_eq!(page_count(11, 5), 3);
+    assert_eq!(page_label(11, 5), "3");
+}
+
+#[test]
+fn small_and_empty_totals() {
+    assert_eq!(page_count(1, 5), 1);
+    assert_eq!(page_count(0, 5), 0);
+}