From 9d70c0a8a6dd8f7cc7aa089ce9987dc84afeeaf0 Mon Sep 17 00:00:00 2001
From: TheMode <themode@outlook.fr>
Date: Tue, 8 Feb 2022 01:54:36 +0100
Subject: [PATCH] Add Collector#assertEmpty

Signed-off-by: TheMode <themode@outlook.fr>
---
 src/test/java/net/minestom/server/api/Collector.java | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/test/java/net/minestom/server/api/Collector.java b/src/test/java/net/minestom/server/api/Collector.java
index 20de16bae..002b71dbf 100644
--- a/src/test/java/net/minestom/server/api/Collector.java
+++ b/src/test/java/net/minestom/server/api/Collector.java
@@ -11,6 +11,11 @@ import static org.junit.jupiter.api.Assertions.assertInstanceOf;
 public interface Collector<T> {
     @NotNull List<@NotNull T> collect();
 
+    default void assertEmpty() {
+        List<T> elements = collect();
+        assertEquals(0, elements.size(), "Expected 0 element, got " + elements);
+    }
+
     default <P extends T> void assertSingle(@NotNull Class<P> type, @NotNull Consumer<P> consumer) {
         List<T> elements = collect();
         assertEquals(1, elements.size(), "Expected 1 element, got " + elements);