3 files changed, 51 insertions, 1 deletions
diff --git a/src/tests/runner.c b/src/tests/runner.c
index bdc4031..58861da 100644
--- a/src/tests/runner.c
+++ b/src/tests/runner.c
@@ -1,10 +1,13 @@
 #include "test.h"
 #include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
 
 const UnitTest TESTS[] = {
     (UnitTest) { .Name = "Arena out of mem", .Function = ArenaOutOfMemory },
     (UnitTest) { .Name = "Arena allocation", .Function = ArenaAllocation },
-    (UnitTest) { .Name = "Test difficulty calculation", .Function = difficultyCalculator},
+    (UnitTest) { .Name = "Test difficulty calculation", .Function = difficultyCalculator },
+    (UnitTest) { .Name = "Timer display", .Function = timerPrintDisplay },
 };
 
 void SetGreenColor() {
@@ -36,3 +39,12 @@ int main(void) {
     ResetColor();
     return 0;
 }
+
+char *reportError(const char *format, ...) {
+    char outp[16656];
+    va_list argptr;
+    va_start(argptr, format);
+    vsprintf(outp, format, argptr);
+    va_end(argptr);
+    return strdup(outp);
+}
diff --git a/src/tests/test.h b/src/tests/test.h
index 5994ecb..456c9e2 100644
--- a/src/tests/test.h
+++ b/src/tests/test.h
@@ -8,10 +8,13 @@ typedef struct {
     char *(*Function)();
 } UnitTest;
 
+char *reportError(const char *format, ...);
+
 // ========== TESTS ==========
 
 char *ArenaAllocation();
 char *ArenaOutOfMemory();
 char *difficultyCalculator();
+char *timerPrintDisplay();
 
 #endif // TESTS_H
diff --git a/src/tests/ui_elements.c b/src/tests/ui_elements.c
new file mode 100644
index 0000000..a13492d
--- /dev/null
+++ b/src/tests/ui_elements.c
@@ -0,0 +1,35 @@
+#include "../ui_elements/UI.h"
+#include "test.h"
+#include <stddef.h>
+#include <string.h>
+#include <stdio.h>
+
+char *timerPrintDisplay() {
+    char buf[16];
+
+    size_t time = 0;
+    PrintTime(buf, time);
+    if (strcmp(buf, "00:00")) return reportError("The 00:00 test failed: got: '%s'", buf);
+
+    time = 3;
+    PrintTime(buf, time);
+    if (strcmp(buf, "00:03")) return reportError("The 00:03 test failed: got: '%s'", buf);
+
+    time = 30;
+    PrintTime(buf, time);
+    if (strcmp(buf, "00:30")) return reportError("The 00:30 test failed: got: '%s'", buf);
+
+    time = 60;
+    PrintTime(buf, time);
+    if (strcmp(buf, "01:00")) return reportError("The 01:00 test failed: got: '%s'", buf);
+
+    time = 63;
+    PrintTime(buf, time);
+    if (strcmp(buf, "01:03")) return reportError("The 01:03 test failed: got: '%s'", buf);
+
+    time = 60 * 100;
+    PrintTime(buf, time);
+    if (strcmp(buf, "100:00")) return reportError("The 100:00 test failed: got: '%s'", buf);
+
+    return NULL;
+}