1 files changed, 87 insertions, 0 deletions
diff --git a/tests/test_buffers.c b/tests/test_buffers.c
new file mode 100644
index 0000000..7b073f4
--- /dev/null
+++ b/tests/test_buffers.c
@@ -0,0 +1,87 @@
+#include "test_core.h"
+
+#include "ecex.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void test_buffer_editing_and_undo(void) {
+    buffer_t *buffer = buffer_new("edit", NULL, 0);
+    assert(buffer);
+
+    assert(buffer_insert(buffer, "hello") == 0);
+    assert(buffer_insert_char(buffer, '\n') == 0);
+    assert(buffer_insert(buffer, "world") == 0);
+    assert(strcmp(buffer->data, "hello\nworld") == 0);
+    assert(buffer->len == strlen("hello\nworld"));
+    assert(buffer_line_count(buffer) == 2);
+
+    buffer_set_point(buffer, 5);
+    assert(buffer_insert(buffer, ",") == 0);
+    assert(strcmp(buffer->data, "hello,\nworld") == 0);
+
+    assert(buffer_undo(buffer) == 0);
+    assert(strcmp(buffer->data, "hello\nworld") == 0);
+    assert(buffer_redo(buffer) == 0);
+    assert(strcmp(buffer->data, "hello,\nworld") == 0);
+
+    buffer_free(buffer);
+}
+
+void test_buffer_selection_and_search(void) {
+    buffer_t *buffer = buffer_new("select", NULL, 0);
+    assert(buffer);
+
+    assert(buffer_set_text(buffer, "alpha beta gamma beta") == 0);
+    buffer_set_mark(buffer, 6);
+    buffer_set_point(buffer, 10);
+    assert(buffer_has_selection(buffer) == 1);
+
+    size_t start = 0;
+    size_t end = 0;
+    buffer_selection_range(buffer, &start, &end);
+    assert(start == 6);
+    assert(end == 10);
+
+    char *selection = buffer_substring(buffer, start, end);
+    assert(selection);
+    assert(strcmp(selection, "beta") == 0);
+    free(selection);
+
+    assert(buffer_replace_selection(buffer, "delta") == 0);
+    assert(strcmp(buffer->data, "alpha delta gamma beta") == 0);
+
+    size_t pos = 0;
+    assert(buffer_search_forward(buffer, "gamma", 0, &pos) == 0);
+    assert(pos == 12);
+    assert(buffer_search_backward(buffer, "alpha", buffer->len, &pos) == 0);
+    assert(pos == 0);
+    assert(buffer_search_forward(buffer, "missing", 0, &pos) != 0);
+    assert(buffer_undo(buffer) == 0);
+    assert(strcmp(buffer->data, "alpha beta gamma beta") == 0);
+
+    buffer_free(buffer);
+}
+
+void test_buffer_file_round_trip(void) {
+    const char *path = "/tmp/ecex-test-core-buffer.txt";
+    remove(path);
+
+    buffer_t *writer = buffer_new("writer", NULL, 0);
+    assert(writer);
+    assert(buffer_set_text(writer, "one\ntwo\n") == 0);
+    assert(buffer_save_as(writer, path) == 0);
+    assert(writer->modified == 0);
+    buffer_free(writer);
+
+    buffer_t *reader = buffer_new("reader", path, 0);
+    assert(reader);
+    assert(buffer_load_file(reader, path) == 0);
+    assert(strcmp(reader->data, "one\ntwo\n") == 0);
+    assert(reader->modified == 0);
+    buffer_free(reader);
+
+    remove(path);
+}