Testing And Benchmarking in Modelica

Here’s the translation of the Go code to Modelica, along with explanations in Markdown format suitable for Hugo:

Unit testing is an important part of writing principled Modelica programs. Modelica itself doesn’t have a built-in testing framework, but we can use external tools like OpenModelica’s scripting environment or create our own simple testing framework.

For the sake of demonstration, we’ll create a simple function and test it. In a real-world scenario, you would typically organize your code into packages and models.

function IntMin
  input Integer a;
  input Integer b;
  output Integer result;
algorithm
  if a < b then
    result := a;
  else
    result := b;
  end if;
end IntMin;

To test this function, we can create a simple test function:

function TestIntMin
  output Boolean testPassed;
protected
  Integer result;
algorithm
  result := IntMin(2, -2);
  if result == -2 then
    testPassed := true;
  else
    testPassed := false;
    Modelica.Utilities.Streams.print("IntMin(2, -2) = " + String(result) + "; want -2");
  end if;
end TestIntMin;

In Modelica, we don’t have a built-in table-driven testing style, but we can simulate it by creating a function that runs multiple tests:

function TestIntMinMultiple
  output Boolean allTestsPassed;
protected
  Integer testCases[:, 3] = {{0, 1, 0}, {1, 0, 0}, {2, -2, -2}, {0, -1, -1}, {-1, 0, -1}};
  Integer result;
  Boolean testPassed;
algorithm
  allTestsPassed := true;
  for i in 1:size(testCases, 1) loop
    result := IntMin(testCases[i, 1], testCases[i, 2]);
    testPassed := result == testCases[i, 3];
    if not testPassed then
      allTestsPassed := false;
      Modelica.Utilities.Streams.print("Test case (" + String(testCases[i, 1]) + "," + 
                                       String(testCases[i, 2]) + ") failed: got " + 
                                       String(result) + ", want " + String(testCases[i, 3]));
    end if;
  end for;
end TestIntMinMultiple;

Modelica doesn’t have a built-in benchmarking system like Go’s testing package. However, you can measure execution time using Modelica’s built-in time function if you need to benchmark performance:

function BenchmarkIntMin
  output Real executionTime;
protected
  Real startTime;
  Integer dummy;
  constant Integer N = 1000000;
algorithm
  startTime := time();
  for i in 1:N loop
    dummy := IntMin(1, 2);
  end for;
  executionTime := time() - startTime;
end BenchmarkIntMin;

To run these tests and benchmark, you would typically use a simulation environment like OpenModelica. You can create a model that calls these functions and observes the results:

model TestRunner
  Boolean basicTestPassed;
  Boolean multipleTestsPassed;
  Real benchmarkTime;
equation
  basicTestPassed = TestIntMin();
  multipleTestsPassed = TestIntMinMultiple();
  benchmarkTime = BenchmarkIntMin();
end TestRunner;

When you simulate this model, it will run all the tests and the benchmark. You can then check the values of basicTestPassed, multipleTestsPassed, and benchmarkTime to see the results.

Remember that this is a simplified approach to testing in Modelica. In practice, you might use more sophisticated testing frameworks or tools specific to your Modelica development environment.

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Testing And Benchmarking in Modelica