Skip to content

🧪 [Testing Improvement] Add explicit test for HashMap resize logic boundary #30

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
void0x14 wants to merge 1 commit into
base: main
Choose a base branch
from
Open

🧪 [Testing Improvement] Add explicit test for HashMap resize logic boundary #30

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
33 changes: 33 additions & 0 deletions echo-core-zig/src/data/hashmap.zig
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -294,3 +294,36 @@ test "HashMap multiple resizes and collisions" {
// 1000 / 0.75 = 1333.33 -> next power of 2 is 2048
try std.testing.expect(map.entries.len >= 2048);
}

test "HashMap exact resize boundary" {
var map = try HashMap([]const u8, i32).init(std.testing.allocator, 8);
defer map.deinit();

// Initial capacity is 8
try std.testing.expectEqual(@as(usize, 8), map.entries.len);

try map.put("a", 1);
try map.put("b", 2);
try map.put("c", 3);
try map.put("d", 4);
try map.put("e", 5);
try map.put("f", 6);

// Still capacity 8
try std.testing.expectEqual(@as(usize, 8), map.entries.len);

// 7th item triggers resize
try map.put("g", 7);

// Now capacity should be 16
try std.testing.expectEqual(@as(usize, 16), map.entries.len);

// Verify all 7 items still exist
try std.testing.expectEqual(@as(i32, 1), map.get("a").?.*);
try std.testing.expectEqual(@as(i32, 2), map.get("b").?.*);
try std.testing.expectEqual(@as(i32, 3), map.get("c").?.*);
try std.testing.expectEqual(@as(i32, 4), map.get("d").?.*);
try std.testing.expectEqual(@as(i32, 5), map.get("e").?.*);
try std.testing.expectEqual(@as(i32, 6), map.get("f").?.*);
try std.testing.expectEqual(@as(i32, 7), map.get("g").?.*);
}