Timer fixes & tests added

tests/tactility-core/timer_test.cpp

@@ -0,0 +1,63 @@
+#include "doctest.h"
+#include "tactility_core.h"
+#include "timer.h"
+
+
+void* timer_callback_context = NULL;
+static void timer_callback_with_context(void* context) {
+    timer_callback_context = context;
+}
+
+static void timer_callback_with_counter(void* context) {
+    int* int_ptr = (int*)context;
+    (*int_ptr)++;
+}
+
+TEST_CASE("a timer passes the context correctly") {
+    int foo = 1;
+    Timer* timer = tt_timer_alloc(&timer_callback_with_context, TimerTypeOnce, &foo);
+    tt_timer_start(timer, 1);
+    tt_delay_tick(10);
+    tt_timer_stop(timer);
+    tt_timer_free(timer);
+
+    CHECK_EQ(timer_callback_context, &foo);
+}
+
+TEST_CASE("TimerTypePeriodic timers can be stopped and restarted") {
+    int counter = 0;
+    Timer* timer = tt_timer_alloc(&timer_callback_with_counter, TimerTypePeriodic, &counter);
+    tt_timer_start(timer, 1);
+    tt_delay_tick(10);
+    tt_timer_stop(timer);
+    tt_delay_tick(10);
+    tt_timer_stop(timer);
+    tt_timer_free(timer);
+
+    CHECK_GE(counter, 2);
+}
+
+TEST_CASE("TimerTypePeriodic calls the callback periodically") {
+    int counter = 0;
+    int ticks_to_run = 10;
+    Timer* timer = tt_timer_alloc(&timer_callback_with_counter, TimerTypePeriodic, &counter);
+    tt_timer_start(timer, 1);
+    tt_delay_tick(ticks_to_run);
+    tt_timer_stop(timer);
+    tt_timer_free(timer);
+
+    CHECK_EQ(counter, ticks_to_run);
+}
+
+TEST_CASE("restarting TimerTypeOnce timers has no effect") {
+    int counter = 0;
+    Timer* timer = tt_timer_alloc(&timer_callback_with_counter, TimerTypeOnce, &counter);
+    tt_timer_start(timer, 1);
+    tt_delay_tick(10);
+    tt_timer_stop(timer);
+    tt_delay_tick(10);
+    tt_timer_stop(timer);
+    tt_timer_free(timer);
+
+    CHECK_EQ(counter, 1);
+}