Prepping for async

test/error/CMakeLists.txt

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+# Copyright (c) 2026 Dominic Masters
+#
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+include(dusktest)
+
+# Tests
+dusktest(test_error.c)

test/error/test_error.c

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+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "dusktest.h"
+#include "error/error.h"
+#include "thread/thread.h"
+#include "util/memory.h"
+
+// Helper that throws an error.
+static errorret_t helper_throw(void) {
+  errorThrow("Test error %d", 42);
+}
+
+// Helper that returns ok.
+static errorret_t helper_ok(void) {
+  errorOk();
+}
+
+// Helper that chains to helper_throw.
+static errorret_t helper_chain(void) {
+  errorChain(helper_throw());
+  errorOk();
+}
+
+static void test_errorThrow(void **state) {
+  errorret_t ret = helper_throw();
+
+  assert_int_not_equal(ret.code, ERROR_OK);
+  assert_non_null(ret.state);
+  assert_non_null(ret.state->message);
+  assert_non_null(ret.state->lines);
+
+  // Message should contain our format argument
+  assert_non_null(strstr(ret.state->message, "42"));
+
+  errorCatch(ret);
+  assert_int_equal(memoryGetAllocatedCount(), 0);
+}
+
+static void test_errorOk(void **state) {
+  errorret_t ret = helper_ok();
+
+  assert_int_equal(ret.code, ERROR_OK);
+  assert_null(ret.state);
+
+  assert_int_equal(memoryGetAllocatedCount(), 0);
+}
+
+static void test_errorIsOk(void **state) {
+  errorret_t ok = helper_ok();
+  assert_true(errorIsOk(ok));
+  assert_false(errorIsNotOk(ok));
+
+  errorret_t err = helper_throw();
+  assert_false(errorIsOk(err));
+  assert_true(errorIsNotOk(err));
+
+  errorCatch(err);
+  assert_int_equal(memoryGetAllocatedCount(), 0);
+}
+
+static void test_errorChain(void **state) {
+  errorret_t ret = helper_chain();
+
+  // Error propagated up
+  assert_int_not_equal(ret.code, ERROR_OK);
+  assert_non_null(ret.state);
+  assert_non_null(ret.state->lines);
+
+  // Lines should contain at least two stack entries
+  int32_t count = 0;
+  const char_t *p = ret.state->lines;
+  while((p = strstr(p, "  at ")) != NULL) {
+    count++;
+    p++;
+  }
+  assert_true(count >= 2);
+
+  errorCatch(ret);
+  assert_int_equal(memoryGetAllocatedCount(), 0);
+}
+
+static void test_errorCatch_ok(void **state) {
+  // Catching an ok ret should be a no-op
+  errorret_t ret = helper_ok();
+  errorCatch(ret);
+  assert_int_equal(memoryGetAllocatedCount(), 0);
+}
+
+static void test_errorCatch_error(void **state) {
+  errorret_t ret = helper_throw();
+  assert_int_not_equal(ret.code, ERROR_OK);
+
+  errorCatch(ret);
+
+  // After catch the global state should be cleared
+  assert_int_equal(ERROR_STATE.code, ERROR_OK);
+  assert_int_equal(memoryGetAllocatedCount(), 0);
+}
+
+// --- Threaded tests ---
+
+typedef struct {
+  errorcode_t capturedCode;
+  bool_t messageHas42;
+} thread_test_data_t;
+
+static void helper_thread_throw(thread_t *thread) {
+  errorret_t ret = helper_throw();
+  thread_test_data_t *data = (thread_test_data_t *)thread->data;
+  data->capturedCode = ERROR_STATE.code;
+  data->messageHas42 = (strstr(ret.state->message, "42") != NULL);
+  errorCatch(ret);
+}
+
+static void test_error_thread_isolation(void **state) {
+  // Main thread state is clean before the test.
+  assert_int_equal(ERROR_STATE.code, ERROR_OK);
+
+  thread_test_data_t data = { .capturedCode = ERROR_OK, .messageHas42 = false };
+
+  thread_t thread;
+  threadInit(&thread, helper_thread_throw);
+  thread.data = &data;
+  threadStart(&thread);
+  threadStop(&thread);
+
+  // Worker saw ERROR_NOT_OK in its own ERROR_STATE.
+  assert_int_equal(data.capturedCode, ERROR_NOT_OK);
+  assert_true(data.messageHas42);
+
+  // Main thread ERROR_STATE was not touched by the worker.
+  assert_int_equal(ERROR_STATE.code, ERROR_OK);
+
+  assert_int_equal(memoryGetAllocatedCount(), 0);
+}
+
+#define CONCURRENT_THREAD_COUNT 4
+
+static thread_test_data_t concurrent_data[CONCURRENT_THREAD_COUNT];
+static thread_t concurrent_threads[CONCURRENT_THREAD_COUNT];
+
+static void test_error_concurrent_throw(void **state) {
+  for(int32_t i = 0; i < CONCURRENT_THREAD_COUNT; i++) {
+    concurrent_data[i].capturedCode = ERROR_OK;
+    concurrent_data[i].messageHas42 = false;
+    threadInit(&concurrent_threads[i], helper_thread_throw);
+    concurrent_threads[i].data = &concurrent_data[i];
+  }
+
+  for(int32_t i = 0; i < CONCURRENT_THREAD_COUNT; i++) {
+    threadStart(&concurrent_threads[i]);
+  }
+
+  for(int32_t i = 0; i < CONCURRENT_THREAD_COUNT; i++) {
+    threadStop(&concurrent_threads[i]);
+  }
+
+  // Every worker must have seen its own independent error.
+  for(int32_t i = 0; i < CONCURRENT_THREAD_COUNT; i++) {
+    assert_int_equal(concurrent_data[i].capturedCode, ERROR_NOT_OK);
+    assert_true(concurrent_data[i].messageHas42);
+  }
+
+  // Main thread is still clean.
+  assert_int_equal(ERROR_STATE.code, ERROR_OK);
+
+  assert_int_equal(memoryGetAllocatedCount(), 0);
+}
+
+int main(void) {
+  const struct CMUnitTest tests[] = {
+    cmocka_unit_test(test_errorThrow),
+    cmocka_unit_test(test_errorOk),
+    cmocka_unit_test(test_errorIsOk),
+    cmocka_unit_test(test_errorChain),
+    cmocka_unit_test(test_errorCatch_ok),
+    cmocka_unit_test(test_errorCatch_error),
+    cmocka_unit_test(test_error_thread_isolation),
+    cmocka_unit_test(test_error_concurrent_throw),
+  };
+  return cmocka_run_group_tests(tests, NULL, NULL);
+}