tests/main.c

@@ -0,0 +1,32 @@
+#include "test_common.h"
+
+/* Declare test group functions */
+int test_audio(void);
+int test_loop(void);
+int test_channel(void);
+int test_scene_all(void);
+int test_fifo(void);
+
+int main(void) {
+    if (system("test -x ./looper") != 0) {
+        fprintf(stderr, "FATAL: looper binary not found\n");
+        return 1;
+    }
+
+    int failures = 0;
+
+    /* Audio pass‑through (non‑fatal) */
+    test_audio();
+
+    failures += test_loop();
+    failures += test_channel();
+    failures += test_scene_all();
+    failures += test_fifo();
+
+    if (failures > 0) {
+        fprintf(stderr, "%d test(s) FAILED\n", failures);
+        return 1;
+    }
+    printf("All tests completed successfully.\n");
+    return 0;
+}

tests/test_audio.c

@@ -0,0 +1,89 @@
+#include "test_common.h"
+
+static int test_audio_pass_through(void) {
+    printf("Test: audio pass‑through (connectivity)\n");
+    pid_t pid = start_looper();
+    if (pid < 0) return 1;
+    jack_client_t *client;
+    jack_status_t status;
+    client = jack_client_open("test_passthrough", JackNoStartServer, &status);
+    if (client == NULL) {
+        fprintf(stderr, "  SKIP: cannot open JACK client (server not running?)\n");
+        kill(pid, SIGTERM);
+        waitpid(pid, NULL, 0);
+        return 1;
+    }
+    jack_port_t *output_port = jack_port_register(client, "output",
+                           JACK_DEFAULT_AUDIO_TYPE,
+                           JackPortIsOutput, 0);
+    jack_port_t *input_port = jack_port_register(client, "input",
+                           JACK_DEFAULT_AUDIO_TYPE,
+                           JackPortIsInput, 0);
+    if (!output_port || !input_port) {
+        fprintf(stderr, "  FAIL: could not register ports\n");
+        jack_client_close(client);
+        kill(pid, SIGTERM);
+        waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    const char *looper_input = "looper:input";
+    const char *looper_output = "looper:output";
+    char my_output[64], my_input[64];
+    snprintf(my_output, sizeof(my_output), "test_passthrough:output");
+    snprintf(my_input, sizeof(my_input), "test_passthrough:input");
+    if (jack_connect(client, my_output, looper_input) != 0) {
+        fprintf(stderr, "  FAIL: cannot connect\n");
+        jack_client_close(client);
+        kill(pid, SIGTERM);
+        waitpid(pid, NULL, 0);
+        return 1;
+    }
+    if (jack_connect(client, looper_output, my_input) != 0) {
+        fprintf(stderr, "  FAIL: cannot connect\n");
+        jack_client_close(client);
+        kill(pid, SIGTERM);
+        waitpid(pid, NULL, 0);
+        return 1;
+    }
+    passthrough_output_port = output_port;
+    passthrough_input_port = input_port;
+    passthrough_phase = 0.0f;
+    passthrough_freq = 440.0f;
+    passthrough_sample_rate = jack_get_sample_rate(client);
+    passthrough_total_samples = 0;
+    passthrough_sum_sq = 0.0;
+    passthrough_done = 0;
+    continuous_sine = 1;
+    beep_remaining = 0;
+    jack_set_process_callback(client, passthrough_process, NULL);
+    if (jack_activate(client) != 0) {
+        fprintf(stderr, "  FAIL: cannot activate client\n");
+        jack_client_close(client);
+        kill(pid, SIGTERM);
+        waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(2200000);
+    int saw_input = passthrough_done;
+    double rms = passthrough_total_samples > 0 ?
+                 sqrt(passthrough_sum_sq / passthrough_total_samples) : 0.0;
+    jack_deactivate(client);
+    jack_client_close(client);
+    kill(pid, SIGTERM);
+    waitpid(pid, NULL, 0);
+    if (!saw_input) {
+        fprintf(stderr, "  FAIL: looper did not produce output (no callback run?)\n");
+        return 1;
+    }
+    if (rms < 0.001) {
+        fprintf(stderr, "  FAIL: looper output RMS too small (%.6f)\n", rms);
+        return 1;
+    }
+    printf("  PASS (RMS %.6f)\n", rms);
+    return 0;
+}
+
+int test_audio(void) {
+    return test_audio_pass_through();
+}

tests/test_channel.c

@@ -0,0 +1,611 @@
+#include "test_common.h"
+
+static int test_multiple_channels(void) {
+    printf("Test: dynamic channel creation via MIDI command\n");
+    pid_t pid = start_looper();
+    if (pid < 0) return 1;
+    if (init_persistent_midi_client() != 0) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  FAIL: cannot initialise persistent MIDI client\n");
+        return 1;
+    }
+    jack_client_t *client;
+    jack_status_t status;
+    client = jack_client_open("test_multi", JackNoStartServer, &status);
+    if (!client) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  SKIP: no JACK\n");
+        return 1;
+    }
+    if (send_jack_note_on("looper:control", 60, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    int found = 0;
+    for (int retries = 0; retries < 30; retries++) {
+        safe_usleep(100000);
+        const char **ports = jack_get_ports(client, NULL, JACK_DEFAULT_AUDIO_TYPE, 0);
+        if (ports) {
+            for (int i = 0; ports[i]; i++) {
+                if (strstr(ports[i], "looper:channel1_input")) {
+                    found = 1;
+                    jack_free(ports);
+                    goto port_found;
+                }
+            }
+            jack_free(ports);
+        }
+    }
+port_found:
+    ;
+    jack_client_close(client);
+    cleanup_persistent_midi_client();
+    kill(pid, SIGTERM);
+    waitpid(pid, NULL, 0);
+    if (!found) {
+        fprintf(stderr, "  FAIL: channel1_input port not created\n");
+        return 1;
+    }
+    printf("  PASS (channel created)\n");
+    return 0;
+}
+
+static int test_control_key_modifier(void) {
+    printf("Test: control‑key modifier triggers state transition via note 62\n");
+    pid_t pid = start_looper();
+    if (pid < 0) return 1;
+    if (init_persistent_midi_client() != 0) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  FAIL: cannot initialise persistent MIDI client\n");
+        return 1;
+    }
+    jack_client_t *client;
+    jack_status_t status;
+    client = jack_client_open("test_ctrl_key", JackNoStartServer, &status);
+    if (!client) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  SKIP: no JACK\n");
+        return 1;
+    }
+    jack_port_t *audio_out = jack_port_register(client, "out",
+                           JACK_DEFAULT_AUDIO_TYPE,
+                           JackPortIsOutput, 0);
+    jack_port_t *audio_in = jack_port_register(client, "in",
+                           JACK_DEFAULT_AUDIO_TYPE,
+                           JackPortIsInput, 0);
+    if (!audio_out || !audio_in) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    char my_out[64], my_in[64];
+    snprintf(my_out, sizeof(my_out), "test_ctrl_key:out");
+    snprintf(my_in,  sizeof(my_in),  "test_ctrl_key:in");
+    if (jack_connect(client, my_out, "looper:input") ||
+        jack_connect(client, "looper:output", my_in)) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    if (send_jack_note_on("looper:control", 64, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 62, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    int sr = jack_get_sample_rate(client);
+    continuous_sine = 0;
+    beep_remaining = (int)(0.1f * sr);
+    bursts = 0;
+    prev_above = 0;
+    passthrough_output_port = audio_out;
+    passthrough_input_port = audio_in;
+    passthrough_phase = 0.0f;
+    passthrough_freq = 440.0f;
+    passthrough_sample_rate = sr;
+    passthrough_total_samples = 0;
+    passthrough_sum_sq = 0.0;
+    passthrough_done = 0;
+    jack_set_process_callback(client, passthrough_process, NULL);
+    if (jack_activate(client)) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 64, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 62, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(2000000);
+    jack_deactivate(client);
+    jack_client_close(client);
+    cleanup_persistent_midi_client();
+    kill(pid, SIGTERM);
+    waitpid(pid, NULL, 0);
+    int got_bursts = bursts;
+    printf("  detected bursts: %d\n", got_bursts);
+    if (got_bursts < 3) {
+        fprintf(stderr, "  FAIL: expected ≥3 bursts, got %d\n", got_bursts);
+        return 1;
+    }
+    printf("  PASS (control‑key modifier works)\n");
+    return 0;
+}
+
+static int test_bind_channel(void) {
+    printf("Test: control‑key bind channel (note 0) and toggle\n");
+    pid_t pid = start_looper();
+    if (pid < 0) return 1;
+    if (init_persistent_midi_client() != 0) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  FAIL: cannot initialise persistent MIDI client\n");
+        return 1;
+    }
+    jack_client_t *client;
+    jack_status_t status;
+    client = jack_client_open("test_bind", JackNoStartServer, &status);
+    if (!client) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  SKIP: no JACK\n");
+        return 1;
+    }
+    jack_port_t *audio_out = jack_port_register(client, "out",
+                           JACK_DEFAULT_AUDIO_TYPE,
+                           JackPortIsOutput, 0);
+    jack_port_t *audio_in = jack_port_register(client, "in",
+                           JACK_DEFAULT_AUDIO_TYPE,
+                           JackPortIsInput, 0);
+    if (!audio_out || !audio_in) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    char my_out[64], my_in[64];
+    snprintf(my_out, sizeof(my_out), "test_bind:out");
+    snprintf(my_in,  sizeof(my_in),  "test_bind:in");
+    if (jack_connect(client, my_out, "looper:input") ||
+        jack_connect(client, "looper:output", my_in)) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    if (send_jack_note_on("looper:control", 64, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 0, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 64, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 62, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    int sr = jack_get_sample_rate(client);
+    continuous_sine = 0;
+    beep_remaining = (int)(0.1f * sr);
+    bursts = 0;
+    prev_above = 0;
+    passthrough_output_port = audio_out;
+    passthrough_input_port = audio_in;
+    passthrough_phase = 0.0f;
+    passthrough_freq = 440.0f;
+    passthrough_sample_rate = sr;
+    passthrough_total_samples = 0;
+    passthrough_sum_sq = 0.0;
+    passthrough_done = 0;
+    jack_set_process_callback(client, passthrough_process, NULL);
+    if (jack_activate(client)) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 64, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 62, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(2000000);
+    jack_deactivate(client);
+    jack_client_close(client);
+    cleanup_persistent_midi_client();
+    kill(pid, SIGTERM);
+    waitpid(pid, NULL, 0);
+    int got_bursts = bursts;
+    printf("  detected bursts: %d\n", got_bursts);
+    if (got_bursts < 3) {
+        fprintf(stderr, "  FAIL: expected >=3 bursts, got %d\n", got_bursts);
+        return 1;
+    }
+    printf("  PASS (bind and toggle)\n");
+    return 0;
+}
+
+static int test_bind_unbind(void) {
+    printf("Test: bind to channel 5, unbind, then toggle default (channel 0)\n");
+    pid_t pid = start_looper();
+    if (pid < 0) return 1;
+    if (init_persistent_midi_client() != 0) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  FAIL: cannot initialise persistent MIDI client\n");
+        return 1;
+    }
+    jack_client_t *client;
+    jack_status_t status;
+    client = jack_client_open("test_unbind", JackNoStartServer, &status);
+    if (!client) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  SKIP: no JACK\n");
+        return 1;
+    }
+    jack_port_t *audio_out = jack_port_register(client, "out",
+                           JACK_DEFAULT_AUDIO_TYPE,
+                           JackPortIsOutput, 0);
+    jack_port_t *audio_in = jack_port_register(client, "in",
+                           JACK_DEFAULT_AUDIO_TYPE,
+                           JackPortIsInput, 0);
+    if (!audio_out || !audio_in) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    char my_out[64], my_in[64];
+    snprintf(my_out, sizeof(my_out), "test_unbind:out");
+    snprintf(my_in,  sizeof(my_in),  "test_unbind:in");
+    if (jack_connect(client, my_out, "looper:input") ||
+        jack_connect(client, "looper:output", my_in)) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    if (send_jack_note_on("looper:control", 64, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 5, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 64, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 63, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 64, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 62, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    int sr = jack_get_sample_rate(client);
+    continuous_sine = 0;
+    beep_remaining = (int)(0.1f * sr);
+    bursts = 0;
+    prev_above = 0;
+    passthrough_output_port = audio_out;
+    passthrough_input_port = audio_in;
+    passthrough_phase = 0.0f;
+    passthrough_freq = 440.0f;
+    passthrough_sample_rate = sr;
+    passthrough_total_samples = 0;
+    passthrough_sum_sq = 0.0;
+    passthrough_done = 0;
+    jack_set_process_callback(client, passthrough_process, NULL);
+    if (jack_activate(client)) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 64, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 62, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(2000000);
+    jack_deactivate(client);
+    jack_client_close(client);
+    cleanup_persistent_midi_client();
+    kill(pid, SIGTERM);
+    waitpid(pid, NULL, 0);
+    int got_bursts = bursts;
+    printf("  detected bursts: %d\n", got_bursts);
+    if (got_bursts < 3) {
+        fprintf(stderr, "  FAIL: expected >=3 bursts, got %d\n", got_bursts);
+        return 1;
+    }
+    printf("  PASS (unbind works, toggle channel 0)\n");
+    return 0;
+}
+
+static int test_remove_channel(void) {
+    printf("Test: dynamic channel removal via MIDI command\n");
+    pid_t pid = start_looper();
+    if (pid < 0) return 1;
+    if (init_persistent_midi_client() != 0) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  FAIL: cannot initialise persistent MIDI client\n");
+        return 1;
+    }
+    jack_client_t *client;
+    jack_status_t status;
+    client = jack_client_open("test_remove", JackNoStartServer, &status);
+    if (!client) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  SKIP: no JACK\n");
+        return 1;
+    }
+    if (send_jack_note_on("looper:control", 60, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(1500000);
+    const char **ports = jack_get_ports(client, NULL, JACK_DEFAULT_AUDIO_TYPE, 0);
+    int found = 0;
+    if (ports) {
+        for (int i = 0; ports[i]; i++) {
+            if (strstr(ports[i], "looper:channel1_input")) {
+                found = 1;
+                break;
+            }
+        }
+        jack_free(ports);
+    }
+    if (!found) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  FAIL: channel1_input not created\n");
+        return 1;
+    }
+    printf("  channel1_input created\n");
+    if (send_jack_note_on("looper:control", 61, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    int still_found = 1;
+    for (int retries = 0; retries < 30; retries++) {
+        safe_usleep(100000);
+        ports = jack_get_ports(client, NULL, JACK_DEFAULT_AUDIO_TYPE, 0);
+        still_found = 0;
+        if (ports) {
+            for (int i = 0; ports[i]; i++) {
+                if (strstr(ports[i], "looper:channel1_input")) {
+                    still_found = 1;
+                    break;
+                }
+            }
+            jack_free(ports);
+        }
+        if (!still_found) break;
+    }
+    jack_client_close(client);
+    cleanup_persistent_midi_client();
+    kill(pid, SIGTERM);
+    waitpid(pid, NULL, 0);
+    if (still_found) {
+        fprintf(stderr, "  FAIL: channel1_input not removed after remove command\n");
+        return 1;
+    }
+    printf("  PASS (channel removed)\n");
+    return 0;
+}
+
+static int test_stop_midi(void) {
+    printf("Test: MIDI stop (note 65 under control key)\n");
+    pid_t pid = start_looper();
+    if (pid < 0) return 1;
+    if (init_persistent_midi_client() != 0) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  FAIL: cannot initialise persistent MIDI client\n");
+        return 1;
+    }
+    jack_client_t *client;
+    jack_status_t status;
+    client = jack_client_open("test_stop", JackNoStartServer, &status);
+    if (!client) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  SKIP: no JACK\n");
+        return 1;
+    }
+    jack_port_t *audio_out = jack_port_register(client, "out",
+                           JACK_DEFAULT_AUDIO_TYPE,
+                           JackPortIsOutput, 0);
+    jack_port_t *audio_in = jack_port_register(client, "in",
+                           JACK_DEFAULT_AUDIO_TYPE,
+                           JackPortIsInput, 0);
+    if (!audio_out || !audio_in) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    char my_out[64], my_in[64];
+    snprintf(my_out, sizeof(my_out), "test_stop:out");
+    snprintf(my_in,  sizeof(my_in),  "test_stop:in");
+    if (jack_connect(client, my_out, "looper:input") ||
+        jack_connect(client, "looper:output", my_in)) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    if (send_jack_note_on("looper:control", 1, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    int sr = jack_get_sample_rate(client);
+    continuous_sine = 0;
+    beep_remaining = (int)(0.2f * sr);
+    bursts = 0;
+    prev_above = 0;
+    passthrough_output_port = audio_out;
+    passthrough_input_port = audio_in;
+    passthrough_phase = 0.0f;
+    passthrough_freq = 440.0f;
+    passthrough_sample_rate = sr;
+    passthrough_total_samples = 0;
+    passthrough_sum_sq = 0.0;
+    passthrough_done = 0;
+    jack_set_process_callback(client, passthrough_process, NULL);
+    if (jack_activate(client)) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(150000);
+    if (send_jack_note_on("looper:control", 1, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(500000);
+    if (send_jack_note_on("looper:control", 64, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 65, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    int prev = bursts;
+    for (int retries = 0; retries < 20; retries++) {
+        safe_usleep(100000);
+        int cur = bursts;
+        if (cur == prev) break;
+        prev = cur;
+    }
+    int bursts_before = bursts;
+    safe_usleep(500000);
+    int bursts_after = bursts;
+    jack_deactivate(client);
+    jack_client_close(client);
+    cleanup_persistent_midi_client();
+    kill(pid, SIGTERM);
+    waitpid(pid, NULL, 0);
+    if (bursts_after > bursts_before + 5) {
+        fprintf(stderr, "  FAIL: bursts continued after stop (%d -> %d)\n",
+                bursts_before, bursts_after);
+        return 1;
+    }
+    printf("  PASS (stop stopped playback)\n");
+    return 0;
+}
+
+static int test_midi_channel_add(void) {
+    printf("Test: MIDI channel creation via FIFO (add_midi)\n");
+    pid_t pid = start_looper();
+    if (pid < 0) return 1;
+    jack_client_t *client;
+    jack_status_t status;
+    client = jack_client_open("test_midi_add", JackNoStartServer, &status);
+    if (!client) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  SKIP: no JACK\n");
+        return 1;
+    }
+    int fd = open("/tmp/looper_cmd", O_WRONLY);
+    if (fd < 0) {
+        perror("open fifo");
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    write(fd, "add_midi\n", 9);
+    close(fd);
+    safe_usleep(1500000);
+    const char **ports = jack_get_ports(client, NULL, JACK_DEFAULT_MIDI_TYPE, 0);
+    int found = 0;
+    if (ports) {
+        for (int i = 0; ports[i]; i++) {
+            if (strstr(ports[i], "looper:channel1_midi_in")) {
+                found = 1;
+                break;
+            }
+        }
+        jack_free(ports);
+    }
+    jack_client_close(client);
+    kill(pid, SIGTERM);
+    waitpid(pid, NULL, 0);
+    if (!found) {
+        fprintf(stderr, "  FAIL: channel1_midi_in port not created\n");
+        return 1;
+    }
+    printf("  PASS (MIDI channel created)\n");
+    return 0;
+}
+
+int test_channel(void) {
+    int failures = 0;
+    failures += test_multiple_channels();
+    failures += test_control_key_modifier();
+    failures += test_bind_channel();
+    failures += test_bind_unbind();
+    failures += test_remove_channel();
+    failures += test_stop_midi();
+    failures += test_midi_channel_add();
+    return failures;
+}

tests/test_fifo.c

@@ -0,0 +1,160 @@
+#include "test_common.h"
+
+static int test_fifo_pipe(void) {
+    printf("Test: FIFO pipe add/remove\n");
+    pid_t pid = start_looper();
+    if (pid < 0) return 1;
+    jack_client_t *client;
+    jack_status_t status;
+    client = jack_client_open("test_fifo", JackNoStartServer, &status);
+    if (!client) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  SKIP: no JACK\n");
+        return 1;
+    }
+    int fd = open("/tmp/looper_cmd", O_WRONLY);
+    if (fd < 0) {
+        perror("open fifo");
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    write(fd, "add\n", 4);
+    safe_usleep(1500000);
+    const char **ports = jack_get_ports(client, NULL, JACK_DEFAULT_AUDIO_TYPE, 0);
+    int found = 0;
+    if (ports) {
+        for (int i = 0; ports[i]; i++) {
+            if (strstr(ports[i], "looper:channel1_input")) {
+                found = 1;
+                break;
+            }
+        }
+        jack_free(ports);
+    }
+    write(fd, "remove\n", 7);
+    close(fd);
+    safe_usleep(1500000);
+    ports = jack_get_ports(client, NULL, JACK_DEFAULT_AUDIO_TYPE, 0);
+    int still_found = 0;
+    if (ports) {
+        for (int i = 0; ports[i]; i++) {
+            if (strstr(ports[i], "looper:channel1_input")) {
+                still_found = 1;
+                break;
+            }
+        }
+        jack_free(ports);
+    }
+    jack_client_close(client);
+    kill(pid, SIGTERM);
+    waitpid(pid, NULL, 0);
+    if (!found) {
+        fprintf(stderr, "  FAIL: channel not added via FIFO\n");
+        return 1;
+    }
+    if (still_found) {
+        fprintf(stderr, "  FAIL: channel not removed via FIFO\n");
+        return 1;
+    }
+    printf("  PASS (FIFO add/remove works)\n");
+    return 0;
+}
+
+static int test_fifo_stop_bind_unbind(void) {
+    printf("Test: FIFO stop, bind, unbind\n");
+    pid_t pid = start_looper();
+    if (pid < 0) return 1;
+    if (init_persistent_midi_client() != 0) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  FAIL: cannot initialise persistent MIDI client\n");
+        return 1;
+    }
+    jack_client_t *client;
+    jack_status_t status;
+    client = jack_client_open("test_fifo_stop", JackNoStartServer, &status);
+    if (!client) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  SKIP: no JACK\n");
+        return 1;
+    }
+    jack_port_t *audio_out = jack_port_register(client, "out",
+                           JACK_DEFAULT_AUDIO_TYPE,
+                           JackPortIsOutput, 0);
+    jack_port_t *audio_in = jack_port_register(client, "in",
+                           JACK_DEFAULT_AUDIO_TYPE,
+                           JackPortIsInput, 0);
+    if (!audio_out || !audio_in) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    char my_out[64], my_in[64];
+    snprintf(my_out, sizeof(my_out), "test_fifo_stop:out");
+    snprintf(my_in,  sizeof(my_in),  "test_fifo_stop:in");
+    if (jack_connect(client, my_out, "looper:input") ||
+        jack_connect(client, "looper:output", my_in)) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    if (send_jack_note_on("looper:control", 1, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    int sr = jack_get_sample_rate(client);
+    continuous_sine = 0;
+    beep_remaining = (int)(0.1f * sr);
+    bursts = 0;
+    prev_above = 0;
+    passthrough_output_port = audio_out;
+    passthrough_input_port = audio_in;
+    passthrough_phase = 0.0f;
+    passthrough_freq = 440.0f;
+    passthrough_sample_rate = sr;
+    passthrough_total_samples = 0;
+    passthrough_sum_sq = 0.0;
+    passthrough_done = 0;
+    jack_set_process_callback(client, passthrough_process, NULL);
+    if (jack_activate(client)) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(150000);
+    int fd = open("/tmp/looper_cmd", O_WRONLY);
+    if (fd < 0) {
+        perror("open fifo");
+        jack_deactivate(client);
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    write(fd, "stop\n", 5);
+    write(fd, "bind 0\n", 7);
+    write(fd, "unbind\n", 7);
+    close(fd);
+    safe_usleep(500000);
+    int bursts_after = bursts;
+    jack_deactivate(client);
+    jack_client_close(client);
+    cleanup_persistent_midi_client();
+    kill(pid, SIGTERM);
+    waitpid(pid, NULL, 0);
+    if (bursts_after < 1) {
+        fprintf(stderr, "  FAIL: no burst detected (probably no recording)\n");
+        return 1;
+    }
+    printf("  PASS (FIFO stop, bind, unbind executed)\n");
+    return 0;
+}
+
+int test_fifo(void) {
+    int failures = 0;
+    failures += test_fifo_pipe();
+    failures += test_fifo_stop_bind_unbind();
+    return failures;
+}

tests/test_loop.c

@@ -0,0 +1,190 @@
+#include "test_common.h"
+
+static int test_looper_looping(void) {
+    printf("Test: loop recording and playback (expect ≥3 repetitions)\n");
+    pid_t pid = start_looper();
+    if (pid < 0) return 1;
+    if (init_persistent_midi_client() != 0) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  FAIL: cannot initialise persistent MIDI client\n");
+        return 1;
+    }
+    jack_client_t *client;
+    jack_status_t status;
+    client = jack_client_open("test_looping", JackNoStartServer, &status);
+    if (!client) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  SKIP: JACK not running?\n");
+        return 1;
+    }
+    jack_port_t *audio_out = jack_port_register(client, "out",
+                           JACK_DEFAULT_AUDIO_TYPE,
+                           JackPortIsOutput, 0);
+    jack_port_t *audio_in = jack_port_register(client, "in",
+                           JACK_DEFAULT_AUDIO_TYPE,
+                           JackPortIsInput, 0);
+    if (!audio_out || !audio_in) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    char my_out[64], my_in[64];
+    snprintf(my_out, sizeof(my_out), "test_looping:out");
+    snprintf(my_in,  sizeof(my_in),  "test_looping:in");
+    if (jack_connect(client, my_out, "looper:input") ||
+        jack_connect(client, "looper:output", my_in)) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    if (send_jack_note_on("looper:control", 1, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(500000);
+    int sr = jack_get_sample_rate(client);
+    continuous_sine = 0;
+    beep_remaining = (int)(0.1f * sr);
+    bursts = 0;
+    prev_above = 0;
+    passthrough_output_port = audio_out;
+    passthrough_input_port = audio_in;
+    passthrough_phase = 0.0f;
+    passthrough_freq = 440.0f;
+    passthrough_sample_rate = sr;
+    passthrough_total_samples = 0;
+    passthrough_sum_sq = 0.0;
+    passthrough_done = 0;
+    jack_set_process_callback(client, passthrough_process, NULL);
+    if (jack_activate(client)) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(150000);
+    safe_usleep(800000);
+    if (send_jack_note_on("looper:control", 1, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(4000000);
+    jack_deactivate(client);
+    jack_client_close(client);
+    cleanup_persistent_midi_client();
+    kill(pid, SIGTERM);
+    waitpid(pid, NULL, 0);
+    int got_bursts = bursts;
+    printf("  detected bursts: %d\n", got_bursts);
+    if (got_bursts < 3) {
+        fprintf(stderr, "  FAIL: expected ≥3 bursts, got %d\n", got_bursts);
+        return 1;
+    }
+    printf("  PASS (at least 3 repetitions)\n");
+    return 0;
+}
+
+static int test_record_loop_stop(void) {
+    printf("Test: full record‑loop‑stop (≥5 repetitions)\n");
+    pid_t pid = start_looper();
+    if (pid < 0) return 1;
+    if (init_persistent_midi_client() != 0) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  FAIL: cannot initialise persistent MIDI client\n");
+        return 1;
+    }
+    jack_client_t *client;
+    jack_status_t status;
+    client = jack_client_open("test_full", JackNoStartServer, &status);
+    if (!client) {
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        fprintf(stderr, "  SKIP: no JACK\n");
+        return 1;
+    }
+    jack_port_t *audio_out = jack_port_register(client, "out",
+                           JACK_DEFAULT_AUDIO_TYPE,
+                           JackPortIsOutput, 0);
+    jack_port_t *audio_in = jack_port_register(client, "in",
+                           JACK_DEFAULT_AUDIO_TYPE,
+                           JackPortIsInput, 0);
+    if (!audio_out || !audio_in) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    char my_out[64], my_in[64];
+    snprintf(my_out, sizeof(my_out), "test_full:out");
+    snprintf(my_in,  sizeof(my_in),  "test_full:in");
+    if (jack_connect(client, my_out, "looper:input") ||
+        jack_connect(client, "looper:output", my_in)) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    if (send_jack_note_on("looper:control", 1, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(500000);
+    int sr = jack_get_sample_rate(client);
+    continuous_sine = 0;
+    beep_remaining = (int)(0.5f * sr);
+    bursts = 0;
+    prev_above = 0;
+    passthrough_output_port = audio_out;
+    passthrough_input_port = audio_in;
+    passthrough_phase = 0.0f;
+    passthrough_freq = 440.0f;
+    passthrough_sample_rate = sr;
+    passthrough_total_samples = 0;
+    passthrough_sum_sq = 0.0;
+    passthrough_done = 0;
+    jack_set_process_callback(client, passthrough_process, NULL);
+    if (jack_activate(client)) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 1, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(2500000);
+    if (send_jack_note_on("looper:control", 64, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    if (send_jack_note_on("looper:control", 65, 127) != 0) {
+        jack_client_close(client);
+        kill(pid, SIGTERM); waitpid(pid, NULL, 0);
+        return 1;
+    }
+    safe_usleep(200000);
+    int total_bursts = bursts;
+    jack_deactivate(client);
+    jack_client_close(client);
+    cleanup_persistent_midi_client();
+    kill(pid, SIGTERM);
+    waitpid(pid, NULL, 0);
+    if (total_bursts < 5) {
+        fprintf(stderr, "  FAIL: expected ≥5 bursts, got %d\n", total_bursts);
+        return 1;
+    }
+    printf("  PASS (≥5 repetitions, stopped cleanly)\n");
+    return 0;
+}
+
+int test_loop(void) {
+    int failures = 0;
+    failures += test_looper_looping();
+    failures += test_record_loop_stop();
+    return failures;
+}