test: 测试工具类的私有构造器

src/test/java/xyz/zhouxy/plusone/commons/function/FunctionTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2023-2024 the original author or authors.
+ * Copyright 2023-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,8 +16,13 @@
 
 package xyz.zhouxy.plusone.commons.function;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertInstanceOf;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
+import java.lang.reflect.Constructor;
+import java.util.Arrays;
 import java.util.Objects;
 import java.util.function.Predicate;
 
@@ -33,4 +38,18 @@ class FunctionTests {
                 .and(StringUtils::isNotBlank);
         assertFalse(predicate.test(str), "校验应是不通过");
     }
+
+    @Test
+    void test_constructorOfPredicateTools_isNotAccessible_ThrowsIllegalStateException() {
+        Constructor<?>[] constructors = PredicateTools.class.getDeclaredConstructors();
+        Arrays.stream(constructors)
+                .forEach(constructor -> {
+                    assertFalse(constructor.isAccessible());
+                    constructor.setAccessible(true);
+                    Throwable cause = assertThrows(Exception.class, constructor::newInstance)
+                            .getCause();
+                    assertInstanceOf(IllegalStateException.class, cause);
+                    assertEquals("Utility class", cause.getMessage());
+                });
+    }
 }