如果您有：

class MyTest
  TESTCASES = {
    # input => expected
    a: "a",
    b: "b",
    c: "c",
  }

  def test_testcases
    TESTCASES.each do |entry, expected|
      result = process_one(entry)
      assert(expected, result)
    end
  end
end

字符串
你真的想在自己的测试中运行每个案例，那么它只是：

MyTest
  TESTCASES = {
    # input => expected
    a: "a",
    b: "b",
    c: "c",
  }

  TESTCASES.each do |entry, expected|
    define_method("test_testcase_#{entry}") do
      result = process_one(entry)
      assert(expected, result)
    end
  end
end

型
如果你真的想拥有和Java中完全相同的语法，可以将上面的转换成一个库，这样就可以工作了：

testcase_parameters(TESTCASES) # left as an exercise to the reader
def test_testcase(entry, expected)
  assert(expected, process_one(entry))
end

型
但我不认为如此间接/抽象有什么好处。我建议保持明确，保持代码和执行状态可检查且易于调试：

class MyTest
  TESTCASES = {
    # input => expected
    a: "a",
    b: "b",
    c: "c",
  }

  def test_testcases
    results = TESTCASES.map do |entry, expected|
      result = process_one(entry)
      [entry, [expected, result]]
    end

    invalid_results = results.select { |e, (ex, res)| ex != res }

    # This is a very easy-to-breakpoint place in code, to easily view all results:
    # binding.pry

    assert_empty invalid_results # failure cases will be printed out by test output
  end
end

型