reasampler/tests/test_insert_fx_enable.cpp

// Standalone tests for reasampler::ui::insert_fx_enable — no REAPER, no test framework.
// Exhaustive over the fold's whole input space (track selected x capture-count class),
// plus the two properties the shell leans on: the button bit is the fold restricted to
// the payload axis, and every refusal carries a non-empty sentence (a silent refusal is
// the failure mode this verb must not have).

#include "../src/core/ui/insert_fx_enable.h"

#include <cstdio>
#include <string>

using namespace reasampler::ui;

static int g_fail = 0;
#define CHECK(cond) do { if(!(cond)) { \
    std::printf("FAIL line %d: %s\n", __LINE__, #cond); ++g_fail; } } while(0)

// All six combinations of {no track, track} x {0, 1, many captures}. The payload axis is
// checked BEFORE the destination axis, so a press with neither a capture nor a track
// reports the capture problem — the one the user can fix inside the panel they clicked.
static void testEveryCombination() {
    CHECK(insertFxRefusal(0, false) == InsertFxRefusal::NoCapture);
    CHECK(insertFxRefusal(0, true) == InsertFxRefusal::NoCapture);
    CHECK(insertFxRefusal(1, false) == InsertFxRefusal::NoTrack);
    CHECK(insertFxRefusal(1, true) == InsertFxRefusal::None);
    CHECK(insertFxRefusal(3, false) == InsertFxRefusal::MultiCapture);
    CHECK(insertFxRefusal(3, true) == InsertFxRefusal::MultiCapture);
}

// GetSelectedTrack ignores the master track, so "only the master is selected" is a
// distinct refusal from a plain empty selection -- both are !trackSelected, but the
// message differs so a master-only user isn't told "select a track" when they did.
static void testMasterOnlySelectedIsDistinctFromNoTrack() {
    CHECK(insertFxRefusal(1, false, /*masterOnlySelected=*/true) ==
          InsertFxRefusal::MasterOnlySelected);
    CHECK(insertFxRefusal(1, false, /*masterOnlySelected=*/false) == InsertFxRefusal::NoTrack);
    // The payload axis still runs first -- a bad capture count refuses on ITS reason
    // even with the master selected.
    CHECK(insertFxRefusal(0, false, /*masterOnlySelected=*/true) == InsertFxRefusal::NoCapture);
}

// Exactly one capture is the only count that can run; two is already too many.
static void testOnlyASingleCaptureRuns() {
    CHECK(insertFxRefusal(2, true) == InsertFxRefusal::MultiCapture);
    for (int n = 0; n <= 8; ++n) {
        const bool ready = insertFxRefusal(n, true) == InsertFxRefusal::None;
        CHECK(ready == (n == 1));
    }
}

// A negative count can only come from a caller bug; it must fold to a refusal, never to
// Ready (fail closed — this verb writes to the project).
static void testNegativeCountRefuses() {
    CHECK(insertFxRefusal(-1, true) == InsertFxRefusal::NoCapture);
    CHECK(!insertFxButtonEnabled(-1));
}

// The button bit is the fold with the destination axis held satisfied: it goes dead for
// exactly the two panel-local refusals and stays live otherwise, whatever the project's
// track selection happens to be.
static void testButtonBitIsThePayloadAxisOfTheFold() {
    for (int n = -1; n <= 4; ++n) {
        const bool live = insertFxButtonEnabled(n);
        CHECK(live == (insertFxRefusal(n, true) == InsertFxRefusal::None));
        // A dead button always corresponds to a capture-side refusal, never to NoTrack.
        if (!live) {
            const InsertFxRefusal r = insertFxRefusal(n, false);
            CHECK(r == InsertFxRefusal::NoCapture || r == InsertFxRefusal::MultiCapture);
        }
    }
    CHECK(insertFxButtonEnabled(1));
    CHECK(!insertFxButtonEnabled(0));
    CHECK(!insertFxButtonEnabled(2));
}

// Every refusal says something, and each says something DIFFERENT — a shared sentence
// would leave the user unable to tell which condition they hit. None says nothing.
static void testEveryRefusalHasItsOwnSentence() {
    const std::string none = insertFxRefusalMessage(InsertFxRefusal::None);
    const std::string noCap = insertFxRefusalMessage(InsertFxRefusal::NoCapture);
    const std::string multi = insertFxRefusalMessage(InsertFxRefusal::MultiCapture);
    const std::string noTrk = insertFxRefusalMessage(InsertFxRefusal::NoTrack);
    const std::string masterOnly = insertFxRefusalMessage(InsertFxRefusal::MasterOnlySelected);

    CHECK(none.empty());
    CHECK(!noCap.empty());
    CHECK(!multi.empty());
    CHECK(!noTrk.empty());
    CHECK(!masterOnly.empty());
    CHECK(noCap != multi);
    CHECK(noCap != noTrk);
    CHECK(multi != noTrk);
    CHECK(masterOnly != noTrk);
    CHECK(masterOnly != noCap);
    CHECK(masterOnly != multi);
}

int main() {
    testEveryCombination();
    testMasterOnlySelectedIsDistinctFromNoTrack();
    testOnlyASingleCaptureRuns();
    testNegativeCountRefuses();
    testButtonBitIsThePayloadAxisOfTheFold();
    testEveryRefusalHasItsOwnSentence();

    if (g_fail == 0) std::printf("insert_fx_enable: all tests passed\n");
    else std::printf("insert_fx_enable: %d CHECK(s) FAILED\n", g_fail);
    return g_fail == 0 ? 0 : 1;
}