add test

hutool-core/src/test/java/cn/hutool/core/convert/ConvertTest.java

@@ -1,5 +1,7 @@
 package cn.hutool.core.convert;
 
+import cn.hutool.core.collection.CollUtil;
+import cn.hutool.core.lang.TypeReference;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.Getter;
@@ -10,6 +12,7 @@ import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Set;
 import java.util.concurrent.atomic.AtomicIntegerArray;
 import java.util.concurrent.atomic.AtomicLongArray;
 
@@ -261,6 +264,13 @@ public class ConvertTest {
 		Assert.assertEquals(1, integer.intValue());
 	}
 
+	@Test
+	public void toSetTest(){
+		final Set<Integer> result = Convert.convert(new TypeReference<Set<Integer>>() {
+		}, "1,2,3");
+		Assert.assertEquals(CollUtil.set(false, 1,2,3), result);
+	}
+
 	@Getter
 	public enum BuildingType {
 		PING(1, "平层"),