feat: integrate real Carla host with JACK support and add plugin abstraction layer

client/tests/test_plugins.c

@@ -0,0 +1,70 @@
+#include <stdio.h>
+#include "plugins.h"
+
+static int tests_passed = 0;
+static int tests_failed = 0;
+
+#define ASSERT_EQ(expected, actual, msg) do { \
+    if ((expected) != (actual)) { \
+        fprintf(stderr, "FAIL: %s  (expected %d, got %d)\n", msg, (int)(expected), (int)(actual)); \
+        tests_failed++; \
+    } else { \
+        printf("PASS: %s\n", msg); \
+        tests_passed++; \
+    } \
+} while(0)
+
+static void test_plugin_load_null_binary(void)
+{
+    int id = -999;
+    int ret = plugin_load(NULL, "someplugin", &id);
+    ASSERT_EQ(-1, ret, "plugin_load(NULL, ...) returns -1");
+}
+
+static void test_plugin_load_nonnull_binary(void)
+{
+    int id = -999;
+    int ret = plugin_load("/path/to/plugin.so", NULL, &id);
+    ASSERT_EQ(-1, ret, "plugin_load(non‑NULL binary, ...) returns -1");
+}
+
+static void test_plugin_unload_invalid_id(void)
+{
+    int ret = plugin_unload(-1);
+    ASSERT_EQ(-1, ret, "plugin_unload(-1) returns -1");
+}
+
+static void test_plugin_connect_invalid_id(void)
+{
+    int ret = plugin_connect(-1, "out", "looper:in");
+    ASSERT_EQ(-1, ret, "plugin_connect(-1, ...) returns -1");
+}
+
+static void test_plugin_disconnect(void)
+{
+    int ret = plugin_disconnect("from_port", "to_port");
+    ASSERT_EQ(0, ret, "plugin_disconnect(...) returns 0");
+}
+
+static void test_plugin_set_bypass_invalid(void)
+{
+    /* set_bypass returns void; just make sure it doesn't crash */
+    plugin_set_bypass(-1, true);
+    printf("PASS: plugin_set_bypass(-1, true) did not crash\n");
+    tests_passed++;
+}
+
+int main(void)
+{
+    printf("=== Plugin stub unit tests ===\n");
+
+    test_plugin_load_null_binary();
+    test_plugin_load_nonnull_binary();
+    test_plugin_unload_invalid_id();
+    test_plugin_connect_invalid_id();
+    test_plugin_disconnect();
+    test_plugin_set_bypass_invalid();
+
+    printf("\nResults: %d passed, %d failed\n", tests_passed, tests_failed);
+    return tests_failed > 0 ? 1 : 0;
+}