+// Testing small reads -- even with a fast source, we shouldn't get more data
+// back than we asked for.
+void test_small_reads()
+{
+ uint8_t bytes[] = { 0xff, 0x80, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 };
+
+ struct custom_read_userdata ud;
+ ud.bytes = bytes;
+ ud.bytes_left = sizeof(bytes);
+
+ struct byte_source source;
+ init_byte_source(&source, custom_read, &ud);
+
+ uint8_t buf[4096];
+ ssize_t ret;
+
+ ret = byte_source_input_func(&source, buf, 4096);
+ assert(ret == 0);
+
+ uint8_t marker = byte_source_read_marker(&source);
+ assert(marker == 0x80);
+
+ for (unsigned i = 0; i < 8; ++i) {
+ ret = byte_source_input_func(&source, buf, 1);
+ assert(ret == 1);
+ assert(buf[0] == i);
+ }
+
+ // Now EOF.
+ ret = byte_source_input_func(&source, buf, 4096);
+ assert(ret == 0);
+}
+