The First Test

We can now create a simple test case to try out our newly created blocks: schedulers/st/test/qa_scheduler_st.cpp

The testing framework used is gtest, which has already been added into the meson.build as a dependency

The test demonstrates the basic commands for configuring and executing a flowgraph:

---

GTest macros encapsulate a test case by defining the test hierarchy and the test case name. We have decided to create a series of tests under SchedulerSTTest and call this test TwoSinks, as we will be fanning out the output of one block to two sinks

TEST(SchedulerSTTest, TwoSinks)
{

Declare the input data we will load into the vector_source, and based on the flowgraph, the data we expect to get out of the vector_sink

    std::vector<float> input_data{ 1.0, 2.0, 3.0, 4.0, 5.0 };
    std::vector<float> expected_data;
    int k = 3.0;
    for (auto& inp : input_data)
    {
        expected_data.push_back(inp * k);
    }

Instantiate the blocks using the make functions

    auto src = blocks::vector_source_f::make(input_data, false);
    auto op = blocks::multiply_const_ff::make(k);
    auto snk1 = blocks::vector_sink_f::make();
    auto snk2 = blocks::vector_sink_f::make();

Create the flowgraph object and connect our blocks

    auto fg = flowgraph::make();
    fg->connect(src, 0, op, 0);
    fg->connect(op, 0, snk1, 0);
    fg->connect(op, 0, snk2, 0);

Create the scheduler, assign it to the flowgraph, and validate (finalize). The scheduler can also be left out to use the default scheduler.

    auto sched = schedulers::scheduler_st::make();
    fg->set_scheduler(sched);
    fg->validate();

Run the flowgraph

    fg->start();
    fg->wait();

Check the results

    EXPECT_EQ(snk1->data(), expected_data);
    EXPECT_EQ(snk2->data(), expected_data);
}

If all succeeded, we should see something like:

[0/1] Running all tests.
1/1 Single Threaded Scheduler Tests OK             0.12s


Ok:                 1   
Expected Fail:      0   
Fail:               0   
Unexpected Pass:    0   
Skipped:            0   
Timeout:            0   

There we have it - we ran our first flowgraph through newsched. Now onto some more advanced topics