命令行接口

remix-tests 

remix-tests 是一种命令行接口工具，用于运行Solidity单元测试。这个工具在Remix的Solidity Unit Testing插件下作为一个库使用。在NPM上以@remix-project/remix-tests的形式在提供。

开始

您可以使用 NPM安装它：

作为开发依赖：

npm install –save-dev @remix-project/remix-tests

作为全局NPM模块：

npm install -g @remix-project/remix-tests

若要确认已安装，请运行：

$ remix-tests version
0.1.36

版本应与NPM上的版本相同。

使用方式

您可以使用 “help” 命令看到所有可用的选项。

$ remix-tests help           
Usage: remix-tests [options] [command]

Options:
  -V, --version            output the version number
  -c, --compiler <string>  set compiler version (e.g: 0.6.1, 0.7.1 etc)
  -e, --evm <string>       set EVM version (e.g: petersburg, istanbul etc)
  -o, --optimize <bool>    enable/disable optimization
  -r, --runs <number>      set runs (e.g: 150, 250 etc)
  -v, --verbose <level>    set verbosity level (0 to 5)
  -h, --help               output usage information

Commands:
  version                  output the version number
  help                     output usage information

命令的一般结构为：

$ remix-tests <options> <file/directory path>

在 “示例” 目录中运行所有测试文件

$ remix-tests examples/

在“示例”目录中运行名为 simplle_storage_test.sol 的单个测试文件

$ remix-tests examples/simple_storage_test.sol

注意: remix-tests 将假定tests(s)文件的名称以 _test.sol为结尾。例如 simple_storage_test.sol

示例

假设有一个名为simple_storage.sol的简单储存合约：

pragma solidity >=0.4.22 <=0.8.0;

contract SimpleStorage {
  uint public storedData;

  constructor() public {
    storedData = 100;
  }

  function set(uint x) public {
    storedData = x;
  }

  function get() public view returns (uint retVal) {
    return storedData;
  }
}

测试文件 simplle_storage_test.sol 可以为：

pragma solidity >=0.4.22 <=0.8.0;
import "remix_tests.sol"; // injected by remix-tests
import "./simple_storage.sol";

contract MyTest {
  SimpleStorage foo;

  function beforeAll() public {
    foo = new SimpleStorage();
  }

  function initialValueShouldBe100() public returns (bool) {
    return Assert.equal(foo.get(), 100, "initial value is not correct");
  }

  function initialValueShouldNotBe200() public returns (bool) {
    return Assert.notEqual(foo.get(), 200, "initial value is not correct");
  }

  function shouldTriggerOneFail() public {
    Assert.equal(uint(1), uint(2), "uint test 1 fails");
    Assert.notEqual(uint(1), uint(2), "uint test 2 passes");
  }

  function shouldTriggerOnePass() public {
    Assert.equal(uint(1), uint(1), "uint test 3 passes");
  }
}

运行 simple_storage_test.sol 文件将输出：

$ remix-tests simple_storage_test.sol

	👁	:: Running remix-tests - Unit testing for solidity ::	👁

'creation of library remix_tests.sol:Assert pending...'

	◼  MyTest
	✓  Initial value should be100
	✓  Initial value should not be200
	✘  Should trigger one fail
	✓  Should trigger one pass


3 passing (0.282s)
1 failing

  1) MyTest: Should trigger one fail

	 error: uint test 1 fails
	 expected value to be equal to: 2
	 returned: 1

自定义编译器环境

大多数 remix-tests 选项都是用于自定义编译器环境的。使用扩展的自定义编译器环境，执行上述测试文件有如下输出：

$ remix-tests --compiler 0.7.4 --evm istanbul --optimize true --runs 300 simple_storage_test.sol

	👁	:: Running remix-tests - Unit testing for solidity ::	👁

[14:03:18] info: Compiler version set to 0.7.4. Latest version is 0.8.0
[14:03:18] info: EVM set to istanbul
[14:03:18] info: Optimization is enabled
[14:03:18] info: Runs set to 300
Loading remote solc version v0.7.4+commit.3f05b770 ...
'creation of library remix_tests.sol:Assert pending...'

	◼  MyTest
	✓  Initial value should be100
	✓  Initial value should not be200
	✘  Should trigger one fail
	✓  Should trigger one pass


3 passing (0.316s)
1 failing

  1) MyTest: Should trigger one fail

	 error: uint test 1 fails
	 expected value to be equal to: 2
	 returned: 1

记住，自定义编译器版本需要网络连接才能加载编译器。

作为CI 的解决办法

remix-tests 也可以用于连续集成(CI)测试。

具体实现样例，请查看Su Squares contract和Travis build，其中使用了remix-tests进行持续集成。