测试可能会抛出IllegalArgumentException异常的方法，使用哪种断言方法比较好

测试可能会抛出IllegalArgumentException异常的方法，使用哪种断言方法比较好

用异常状态断言
llegalState

    /**
     * Assert a boolean expression, throwing <code>IllegalStateException</code>
     * if the test result is <code>false</code>. Call isTrue if you wish to
     * throw IllegalArgumentException on an assertion failure.
     * <pre class="code">Assert.state(id == null, "The id property must not already be initialized");</pre>
     * @param expression a boolean expression
     * @param message the exception message to use if the assertion fails
     * @throws IllegalStateException if expression is <code>false</code>
     */
    public static void state(boolean expression, String message) {
        if (!expression) {
            throw new IllegalStateException(message);
        }
    }

catch-exception库可实现对异常的test，

类似：assertThat(caughtException(),instanceOf(IllegalArgumentException.class));

好处是可以验证异常是被测方法抛出的，而不是其它方法抛出的。

需要先加下如下依赖catch-exception库

<!-- https://mvnrepository.com/artifact/com.googlecode.catch-exception/catch-exception -->
<dependency>
    <groupId>com.googlecode.catch-exception</groupId>
    <artifactId>catch-exception</artifactId>
    <version>1.2.0</version>
    <scope>test</scope>
</dependency>