From 80162c126bfefcf4c2a3bfd06042f4c672397d96 Mon Sep 17 00:00:00 2001
From: Andrew Gaul <andrew@gaul.org>
Date: Wed, 25 Sep 2019 19:21:22 -0700
Subject: [PATCH] Add test for writing to multiple offsets

References #1098.
---
 test/integration-test-main.sh  |  7 +++++++
 test/write_multiple_offsets.py | 18 ++++++++++++++++++
 2 files changed, 25 insertions(+)
 create mode 100755 test/write_multiple_offsets.py

diff --git a/test/integration-test-main.sh b/test/integration-test-main.sh
index 5fca3b4..4bc058c 100755
--- a/test/integration-test-main.sh
+++ b/test/integration-test-main.sh
@@ -650,6 +650,12 @@ function test_open_second_fd {
     rm_test_file second_fd_file
 }
 
+function test_write_multiple_offsets {
+    describe "test writing to multiple offsets"
+    ../../write_multiple_offsets.py ${TEST_TEXT_FILE}
+    rm_test_file
+}
+
 function add_all_tests {
     add_tests test_append_file 
     add_tests test_truncate_file 
@@ -681,6 +687,7 @@ function add_all_tests {
     add_tests test_concurrency
     add_tests test_concurrent_writes
     add_tests test_open_second_fd
+    add_tests test_write_multiple_offsets
 }
 
 init_suite
diff --git a/test/write_multiple_offsets.py b/test/write_multiple_offsets.py
new file mode 100755
index 0000000..a013299
--- /dev/null
+++ b/test/write_multiple_offsets.py
@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+
+import os
+import sys
+
+filename = sys.argv[1]
+data = bytes('a', 'utf-8')
+
+fd = os.open(filename, os.O_CREAT | os.O_TRUNC | os.O_WRONLY)
+try:
+    os.pwrite(fd, data, 1024)
+    os.pwrite(fd, data, 16 * 1024 * 1024)
+    os.pwrite(fd, data, 18 * 1024 * 1024)
+finally:
+    os.close(fd)
+
+stat = os.lstat(filename)
+assert stat.st_size == 18 * 1024 * 1024 + 1