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libraries/FastLED/tests/test_transition_ramp.cpp

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+// test_transition_ramp.cpp
+// g++ --std=c++11 test_transition_ramp.cpp
+
+#include "fl/namespace.h"
+#include "fl/time_alpha.h"
+#include "test.h"
+#include <cstdint>
+
+using namespace fl;
+
+TEST_CASE("Test transition ramp") {
+    // total latch = 100 ms, ramp‑up = 10 ms, ramp‑down = 10 ms
+    TimeRamp ramp(10, 100, 10);
+    uint32_t t0 = 0;
+    ramp.trigger(t0);
+
+    // at start: still at zero
+    REQUIRE(ramp.update8(t0) == 0);
+
+    // mid‑rise: 5 ms → (5*255/10) ≈ 127
+    REQUIRE(ramp.update8(t0 + 5) == static_cast<uint8_t>((5 * 255) / 10));
+
+    // end of rise: 10 ms → full on
+    REQUIRE(ramp.update8(t0 + 10) == 255);
+
+    // plateau: well within [10, 90) ms
+    REQUIRE(ramp.update8(t0 + 50) == 255);
+
+    // mid‑fall: elapsed=95 ms → fallingElapsed=5 ms → 255 - (5*255/10) ≈ 128
+    uint8_t value = ramp.update8(t0 + 115);
+    uint8_t expected = static_cast<uint8_t>(255 - (5 * 255) / 10);
+    REQUIRE_EQ(expected, value);
+
+    // after latch: 110 ms → off
+    // REQUIRE(ramp.update8(t0 + 110) == 0);
+
+    // now do it again
+    ramp.trigger(200);
+    // at start: still at zero
+    REQUIRE(ramp.update8(200) == 0);
+    // mid‑rise: 205 ms → (5*255/10) ≈ 127
+    REQUIRE(ramp.update8(205) == static_cast<uint8_t>((5 * 255) / 10));
+    // end of rise: 210 ms → full on
+    REQUIRE(ramp.update8(210) == 255);
+    // plateau: well within [210, 290) ms
+    REQUIRE(ramp.update8(250) == 255);
+    // mid‑fall: elapsed=295 ms → fallingElapsed=5 ms → 255 - (5*255/10) ≈ 128
+    REQUIRE(ramp.update8(315) == static_cast<uint8_t>(255 - (5 * 255) / 10));
+    // after latch: 310 ms → off
+    REQUIRE(ramp.update8(320) == 0);
+    // after latch: 410 ms → off
+    REQUIRE(ramp.update8(410) == 0);
+}
+
+TEST_CASE("Real world Bug") {
+    TimeRamp transition = TimeRamp(500, 0, 500);
+
+    uint8_t value = transition.update8(0);
+    CHECK(value == 0);
+    value = transition.update8(1);
+    CHECK(value == 0);
+
+    transition.trigger(6900);
+    value = transition.update8(6900);
+    REQUIRE_EQ(value, 0);
+
+    value = transition.update8(6900 + 500);
+    REQUIRE_EQ(value, 255);
+
+    value = transition.update8(6900 + 250);
+    REQUIRE_EQ(value, 127);
+}