The test is trivial: several backends, 1 `mux-be`, 1 frontend
do the buffer write and read. Pipe is used for EAGAIN verification.

Signed-off-by: Roman Penyaev <r.peniaev@gmail.com>
Cc: "Marc-André Lureau" <marcandre.lureau@redhat.com>
Cc: qemu-devel@nongnu.org
---
 tests/unit/test-char.c | 217 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 215 insertions(+), 2 deletions(-)

diff --git a/tests/unit/test-char.c b/tests/unit/test-char.c
index f273ce522612..554129c3b1a9 100644
--- a/tests/unit/test-char.c
+++ b/tests/unit/test-char.c
@@ -177,7 +177,7 @@ static void char_ringbuf_test(void)
     qemu_opts_del(opts);
 }
 
-static void char_mux_test(void)
+static void char_mux_fe_test(void)
 {
     QemuOpts *opts;
     Chardev *chr, *base;
@@ -337,6 +337,218 @@ static void char_mux_test(void)
     qemu_chr_fe_deinit(&chr_be2, true);
 }
 
+static void char_mux_be_test(void)
+{
+    QemuOpts *opts;
+    Chardev *mux_be, *chr1, *chr2, *base;
+    char *data;
+    FeHandler h = { 0, false, 0, false, };
+    CharBackend chr_be;
+    int ret;
+
+#define RB_SIZE 128
+
+    /* Create mux-be */
+    opts = qemu_opts_create(qemu_find_opts("chardev"), "mux0",
+                            1, &error_abort);
+    qemu_opt_set(opts, "backend", "mux-be", &error_abort);
+    mux_be = qemu_chr_new_from_opts(opts, NULL, &error_abort);
+    g_assert_nonnull(mux_be);
+    qemu_opts_del(opts);
+
+    /* Create first chardev */
+    opts = qemu_opts_create(qemu_find_opts("chardev"), "chr1",
+                            1, &error_abort);
+    qemu_opt_set(opts, "backend", "ringbuf", &error_abort);
+    qemu_opt_set(opts, "size", stringify(RB_SIZE), &error_abort);
+    qemu_opt_set(opts, "mux-be-id", "mux0", &error_abort);
+    chr1 = qemu_chr_new_from_opts(opts, NULL, &error_abort);
+    g_assert_nonnull(chr1);
+    qemu_opts_del(opts);
+
+    /* Create second chardev */
+    opts = qemu_opts_create(qemu_find_opts("chardev"), "chr2",
+                            1, &error_abort);
+    qemu_opt_set(opts, "backend", "ringbuf", &error_abort);
+    qemu_opt_set(opts, "size", stringify(RB_SIZE), &error_abort);
+    qemu_opt_set(opts, "mux-be-id", "mux0", &error_abort);
+    chr2 = qemu_chr_new_from_opts(opts, NULL, &error_abort);
+    g_assert_nonnull(chr2);
+    qemu_opts_del(opts);
+
+    /* Attach mux-be to a frontend */
+    qemu_chr_fe_init(&chr_be, mux_be, &error_abort);
+    qemu_chr_fe_set_handlers(&chr_be,
+                             fe_can_read,
+                             fe_read,
+                             fe_event,
+                             NULL,
+                             &h,
+                             NULL, true);
+
+    /* Write to backend, chr1 */
+    base = qemu_chr_find("chr1");
+    g_assert_cmpint(qemu_chr_be_can_write(base), !=, 0);
+
+    qemu_chr_be_write(base, (void *)"hello", 6);
+    g_assert_cmpint(h.read_count, ==, 6);
+    g_assert_cmpstr(h.read_buf, ==, "hello");
+    h.read_count = 0;
+
+    /* Write to backend, chr2 */
+    base = qemu_chr_find("chr2");
+    g_assert_cmpint(qemu_chr_be_can_write(base), !=, 0);
+
+    qemu_chr_be_write(base, (void *)"olleh", 6);
+    g_assert_cmpint(h.read_count, ==, 6);
+    g_assert_cmpstr(h.read_buf, ==, "olleh");
+    h.read_count = 0;
+
+    /* Write to frontend, chr_be */
+    ret = qemu_chr_fe_write(&chr_be, (void *)"heyhey", 6);
+    g_assert_cmpint(ret, ==, 6);
+
+    data = qmp_ringbuf_read("chr1", RB_SIZE, false, 0, &error_abort);
+    g_assert_cmpint(strlen(data), ==, 6);
+    g_assert_cmpstr(data, ==, "heyhey");
+    g_free(data);
+
+    data = qmp_ringbuf_read("chr2", RB_SIZE, false, 0, &error_abort);
+    g_assert_cmpint(strlen(data), ==, 6);
+    g_assert_cmpstr(data, ==, "heyhey");
+    g_free(data);
+
+
+#ifndef _WIN32
+    /*
+     * Create third chardev to simulate EAGAIN and watcher.
+     * Mainly copied from char_pipe_test().
+     */
+    {
+        gchar *tmp_path = g_dir_make_tmp("qemu-test-char.XXXXXX", NULL);
+        gchar *in, *out, *pipe = g_build_filename(tmp_path, "pipe", NULL);
+        Chardev *chr3;
+        int fd, len;
+        char buf[128];
+
+        in = g_strdup_printf("%s.in", pipe);
+        if (mkfifo(in, 0600) < 0) {
+            abort();
+        }
+        out = g_strdup_printf("%s.out", pipe);
+        if (mkfifo(out, 0600) < 0) {
+            abort();
+        }
+
+        opts = qemu_opts_create(qemu_find_opts("chardev"), "chr3",
+                                1, &error_abort);
+        qemu_opt_set(opts, "backend", "pipe", &error_abort);
+        qemu_opt_set(opts, "path", pipe, &error_abort);
+        qemu_opt_set(opts, "mux-be-id", "mux0", &error_abort);
+        chr3 = qemu_chr_new_from_opts(opts, NULL, &error_abort);
+        g_assert_nonnull(chr3);
+
+        /* Write to frontend, chr_be */
+        ret = qemu_chr_fe_write(&chr_be, (void *)"thisis", 6);
+        g_assert_cmpint(ret, ==, 6);
+
+        data = qmp_ringbuf_read("chr1", RB_SIZE, false, 0, &error_abort);
+        g_assert_cmpint(strlen(data), ==, 6);
+        g_assert_cmpstr(data, ==, "thisis");
+        g_free(data);
+
+        data = qmp_ringbuf_read("chr2", RB_SIZE, false, 0, &error_abort);
+        g_assert_cmpint(strlen(data), ==, 6);
+        g_assert_cmpstr(data, ==, "thisis");
+        g_free(data);
+
+        fd = open(out, O_RDWR);
+        ret = read(fd, buf, sizeof(buf));
+        g_assert_cmpint(ret, ==, 6);
+        buf[ret] = 0;
+        g_assert_cmpstr(buf, ==, "thisis");
+        close(fd);
+
+        /* Add watch. 0 indicates no watches if nothing to wait for */
+        ret = qemu_chr_fe_add_watch(&chr_be, G_IO_OUT | G_IO_HUP,
+                                    NULL, NULL);
+        g_assert_cmpint(ret, ==, 0);
+
+        /*
+         * Write to frontend, chr_be, until EAGAIN. Make sure length is
+         * power of two to fit nicely the whole pipe buffer.
+         */
+        len = 0;
+        while ((ret = qemu_chr_fe_write(&chr_be, (void *)"thisisit", 8))
+               != -1) {
+            len += ret;
+        }
+        g_assert_cmpint(errno, ==, EAGAIN);
+
+        /* Further all writes should cause EAGAIN */
+        ret = qemu_chr_fe_write(&chr_be, (void *)"b", 1);
+        g_assert_cmpint(ret, ==, -1);
+        g_assert_cmpint(errno, ==, EAGAIN);
+
+        /*
+         * Add watch. Non 0 indicates we have a blocked chardev, which
+         * can wakes us up when write is possible.
+         */
+        ret = qemu_chr_fe_add_watch(&chr_be, G_IO_OUT | G_IO_HUP,
+                                    NULL, NULL);
+        g_assert_cmpint(ret, !=, 0);
+
+        /* Drain pipe and ring buffers */
+        fd = open(out, O_RDWR);
+        while ((ret = read(fd, buf, MIN(sizeof(buf), len))) != -1 && len > 0) {
+            len -= ret;
+        }
+        close(fd);
+
+        data = qmp_ringbuf_read("chr1", RB_SIZE, false, 0, &error_abort);
+        g_assert_cmpint(strlen(data), ==, 128);
+        g_free(data);
+
+        data = qmp_ringbuf_read("chr2", RB_SIZE, false, 0, &error_abort);
+        g_assert_cmpint(strlen(data), ==, 128);
+        g_free(data);
+
+        /*
+         * Now we are good to go, first repeat "lost" sequence, which
+         * was already consumed and drained by the ring buffers, but
+         * pipe have not recieved that yet.
+         */
+        ret = qemu_chr_fe_write(&chr_be, (void *)"thisisit", 8);
+        g_assert_cmpint(ret, ==, 8);
+
+        ret = qemu_chr_fe_write(&chr_be, (void *)"streamisrestored", 16);
+        g_assert_cmpint(ret, ==, 16);
+
+        data = qmp_ringbuf_read("chr1", RB_SIZE, false, 0, &error_abort);
+        g_assert_cmpint(strlen(data), ==, 16);
+        /* Only last 16 bytes, see big comment above */
+        g_assert_cmpstr(data, ==, "streamisrestored");
+        g_free(data);
+
+        data = qmp_ringbuf_read("chr2", RB_SIZE, false, 0, &error_abort);
+        g_assert_cmpint(strlen(data), ==, 16);
+        /* Only last 16 bytes, see big comment above */
+        g_assert_cmpstr(data, ==, "streamisrestored");
+        g_free(data);
+
+        fd = open(out, O_RDWR);
+        ret = read(fd, buf, sizeof(buf));
+        g_assert_cmpint(ret, ==, 24);
+        buf[ret] = 0;
+        /* Both 8 and 16 bytes */
+        g_assert_cmpstr(buf, ==, "thisisitstreamisrestored");
+        close(fd);
+    }
+#endif
+
+    /* Finalize */
+    qemu_chr_fe_deinit(&chr_be, false);
+}
 
 static void websock_server_read(void *opaque, const uint8_t *buf, int size)
 {
@@ -1484,7 +1696,8 @@ int main(int argc, char **argv)
     g_test_add_func("/char/null", char_null_test);
     g_test_add_func("/char/invalid", char_invalid_test);
     g_test_add_func("/char/ringbuf", char_ringbuf_test);
-    g_test_add_func("/char/mux", char_mux_test);
+    g_test_add_func("/char/mux", char_mux_fe_test);
+    g_test_add_func("/char/mux-be", char_mux_be_test);
 #ifdef _WIN32
     g_test_add_func("/char/console/subprocess", char_console_test_subprocess);
     g_test_add_func("/char/console", char_console_test);
-- 
2.43.0