libctest: zap

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE:= libctest

LOCAL_SRC_FILES := ctest.c

include $(BUILD_SHARED_LIBRARY)

   Copyright (c) 2005-2008, The Android Open Source Project

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/*

 * Copyright (C) 2007 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include <assert.h>

#include <stdlib.h>

#include <stdio.h>

#include <sys/types.h>

#include <sys/wait.h>

#include <unistd.h>

#include <ctest/ctest.h>

#define MAX_TESTS 255

/** Semi-random number used to identify assertion errors. */

#define ASSERTION_ERROR 42

typedef void TestCase();

/** A suite of tests. */

typedef struct {

    int size;

    const char* testNames[MAX_TESTS];

    TestCase* tests[MAX_TESTS];

    int currentTest;

    FILE* out;

} TestSuite;

/** Gets the test suite. Creates it if necessary. */

static TestSuite* getTestSuite() {

    static TestSuite* suite = NULL;

    if (suite != NULL) {

        return suite;

    }

    suite = calloc(1, sizeof(TestSuite));

    assert(suite != NULL);

    suite->out = tmpfile();

    assert(suite->out != NULL);

    return suite;

}

void addNamedTest(const char* name, TestCase* test) {

    TestSuite* testSuite = getTestSuite();

    assert(testSuite->size <= MAX_TESTS);

    int index = testSuite->size;

    testSuite->testNames[index] = name;

    testSuite->tests[index] = test;

    testSuite->size++;

}

/** Prints failures to stderr. */

static void printFailures(int failures) {

    TestSuite* suite = getTestSuite();

    fprintf(stderr, "FAILURE! %d of %d tests failed. Failures:\n", 

            failures, suite->size);

    // Copy test output to stdout.

    rewind(suite->out);

    char buffer[512];

    size_t read;

    while ((read = fread(buffer, sizeof(char), 512, suite->out)) > 0) {

        // TODO: Make sure we actually wrote 'read' bytes.

        fwrite(buffer, sizeof(char), read, stderr);

    }

}

/** Runs a single test case. */

static int runCurrentTest() {

    TestSuite* suite = getTestSuite();

    pid_t pid = fork();

    if (pid == 0) {

        // Child process. Runs test case.

        suite->tests[suite->currentTest]();

        // Exit successfully.

        exit(0);

    } else if (pid < 0) {

        fprintf(stderr, "Fork failed.");

        exit(1); 

    } else {

        // Parent process. Wait for child.

        int status;

        waitpid(pid, &status, 0);

        if (!WIFEXITED(status)) {

            return -1;

        }

        return WEXITSTATUS(status);

    }

}

void runTests() {

    TestSuite* suite = getTestSuite();

    int failures = 0;

    for (suite->currentTest = 0; suite->currentTest < suite->size; 

            suite->currentTest++) {

        // Flush stdout before forking.

        fflush(stdout);

        int result = runCurrentTest();

        if (result != 0) {

            printf("X");

            failures++;

            // Handle errors other than assertions.

            if (result != ASSERTION_ERROR) {

                // TODO: Report file name.

                fprintf(suite->out, "Process failed: [%s] status: %d\n",

                        suite->testNames[suite->currentTest], result);

                fflush(suite->out);

            }

        } else {

            printf(".");

        }

    }

    printf("\n");

    if (failures > 0) {

        printFailures(failures);

    } else {

        printf("SUCCESS! %d tests ran successfully.\n", suite->size);

    }

}

void assertTrueWithSource(int value, const char* file, int line, char* message) {

    if (!value) {

        TestSuite* suite = getTestSuite();

        fprintf(suite->out, "Assertion failed: [%s:%d] %s: %s\n", file, line, 

                suite->testNames[suite->currentTest], message);

        fflush(suite->out);

        // Exit the process for this test case.

        exit(ASSERTION_ERROR);

    }

}