以编程方式从测试用例中删除 try/catch 个块

Programatically Remove try/catch blocks from test cases

我正在为一个研究项目检测测试代码。我们从测试用例开始,例如

@Test
public void test025() throws Throwable {
    if (debug)
        System.out.format("%n%s%n", "RegressionTest1.test025");
    java.lang.Double[] d_array2 = new java.lang.Double[] { 1.0d, (-1.0d) };
    org.apache.commons.math.linear.ArrayRealVector arrayRealVector3 = new org.apache.commons.math.linear.ArrayRealVector(d_array2);
    org.apache.commons.math.linear.ArrayRealVector arrayRealVector4 = new org.apache.commons.math.linear.ArrayRealVector(d_array2);
    try {
        org.apache.commons.math.linear.ArrayRealVector arrayRealVector7 = new org.apache.commons.math.linear.ArrayRealVector(d_array2, (int) '4', (int) ' ');
        org.junit.Assert.fail("Expected exception of type org.apache.commons.math.exception.NumberIsTooLargeException");
    } catch (org.apache.commons.math.exception.NumberIsTooLargeException e) {
    }
    org.junit.Assert.assertNotNull(d_array2);
}

断言语句从 .java 文件中注释掉:

original = original.replace("org.junit.Assert.", "//org.junit.Assert.");
original = original.replace("assert", "//assert");

然后,他们使用 javassist 来记录任何异常(以确保它们发生在所有 运行 的测试用例中):

    for (CtMethod testmethod : methods) {
        if (testmethod.getName().startsWith("test")) {
            try {
                testmethod.insertBefore("semanticrt.statedump.dumpObjectState.setDumpTestCase(\""+testClassName+ "." + testmethod.getName()+"\");");
                CtClass etype = null;
                try {
                    etype = pool.get("java.lang.Exception");
                } catch (NotFoundException e) {
                    e.printStackTrace();
                }

                String exceptionCode = "{ semanticrt.statedump.dumpObjectState.dumpExceptionToFile($e, " +
                        "\"" + outputFileRoot + "."+ testmethod.getName() + ".exception\", false); throw $e; }\n";
                testmethod.addCatch(exceptionCode, etype);
            } catch (CannotCompileException e) {
                System.out.println(testmethod);
                e.printStackTrace();
            }

        }
    }

产生:

@Test
public void test025() throws Throwable {
    try {
        dumpObjectState.setDumpTestCase("RegressionTest1.test025");
        if(debug) {
            System.out.format("%n%s%n", new Object[]{"RegressionTest1.test025"});
        }

        Double[] var1 = new Double[]{Double.valueOf(1.0D), Double.valueOf(-1.0D)};
        new ArrayRealVector(var1);
        new ArrayRealVector(var1);

        try {
            new ArrayRealVector(var1, 52, 32);
        } catch (NumberIsTooLargeException var6) {
            ;
        }

    } catch (Exception var7) {
        dumpObjectState.dumpExceptionToFile(var7, "/home/loren/repos/d4jBugs/Math_45/version/XMLOut//out-RegressionTest1.test025.exception", false);
    }
}

我的问题是 NumberIsTooLargeException 被代码中留下的 try/catch 块吞没了。 (注意:异常 class 可以是任何 class,这只是一个有问题的案例的示例。)所以我需要一种方法来摆脱生成测试中的任何 try/catch 块在我把它们包裹在我的之前的案例。

有谁知道如何使用 javassist 或者我可以在 .java 文件上 运行 删除它们之前使用的一个很好的正则表达式?

我想结束:

@Test
public void test025() throws Throwable {
    try {
        dumpObjectState.setDumpTestCase("RegressionTest1.test025");
        if(debug) {
            System.out.format("%n%s%n", new Object[]{"RegressionTest1.test025"});
        }

        Double[] var1 = new Double[]{Double.valueOf(1.0D), Double.valueOf(-1.0D)};
        new ArrayRealVector(var1);
        new ArrayRealVector(var1);

        new ArrayRealVector(var1, 52, 32);

    } catch (Exception var7) {
        dumpObjectState.dumpExceptionToFile(var7, "/home/loren/repos/d4jBugs/Math_45/version/XMLOut//out-RegressionTest1.test025.exception", false);
    }
}

我找到了一个有效的解决方案。它不会删除 try/catch 块,但会在 catch 的开头添加一个 throw 以提供所需的功能。

testmethod.instrument(
    new ExprEditor() {
        public void edit(Handler m)
                throws CannotCompileException
        {
            m.insertBefore("throw ;");
        }
    }
);

这使得整个循环:

    for (CtMethod testmethod : methods) {
        if (testmethod.getName().startsWith("test")) {
            try {
                testmethod.instrument(
                    new ExprEditor() {
                        public void edit(Handler m)
                                throws CannotCompileException
                        {
                            m.insertBefore("throw ;");
                        }
                    }
                );
                testmethod.insertBefore("semanticrt.statedump.dumpObjectState.setDumpTestCase(\""+testClassName+ "." + testmethod.getName()+"\");");
                CtClass etype = null;
                try {
                    etype = pool.get("java.lang.Exception");
                } catch (NotFoundException e) {
                    e.printStackTrace();
                }
                // See addCatch() https://jboss-javassist.github.io/javassist/tutorial/tutorial2.html
                String exceptionCode = "{ semanticrt.statedump.dumpObjectState.dumpExceptionToFile($e, " +
                        "\"" + outputFileRoot + "."+ testmethod.getName() + ".exception\", false); return; }\n";
                testmethod.addCatch(exceptionCode, etype);
            } catch (CannotCompileException e) {
                System.out.println(testmethod);
                e.printStackTrace();
            }
        }
    }