test1566: verify --etag-compare that gets a 304 back

Verifies the fix in #5183

Closes #5186

tests/data/Makefile.inc

@@ -183,6 +183,7 @@ test1533 test1534 test1535 test1536 test1537 test1538 \
 test1540 test1541 \
 test1550 test1551 test1552 test1553 test1554 test1555 test1556 test1557 \
 test1558 test1559 test1560 test1561 test1562 test1563 test1564 test1565 \
+test1566 \
 \
 test1590 test1591 test1592 test1593 test1594 test1595 test1596 \
 \

tests/data/test1566

@@ -0,0 +1,65 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP GET
+--etag-compare
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<data nocheck="yes">
+HTTP/1.1 304 Not modified
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Last-Modified: Tue, 13 Jun 2000 12:10:00 GMT
+ETag: "21025-dc7-39462498"
+Connection: close
+Content-Type: text/html
+
+</data>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+http
+</server>
+<name>
+--etag-compare that gets a 304 back shouldn't overwrite the file
+</name>
+<command option="no-output,no-include">
+http://%HOSTIP:%HTTPPORT/1566 -o log/output1566 --etag-compare log/etag1566
+</command>
+<file name="log/etag1566">
+123456
+</file>
+<file1 name="log/output1566">
+downloaded already
+</file1>
+
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent:.*
+</strip>
+<protocol>
+GET /1566 HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+Accept: */*
+If-None-Match: "123456"
+
+</protocol>
+
+# verify that the target file is untouched
+<file name="log/output1566">
+downloaded already
+</file>
+</verify>
+</testcase>