Added a test for time dependent copy -and the ability to override it.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@270095 13f79535-47bb-0310-9956-ffa450edef68

src/etc/testcases/taskdefs/copy.xml

@@ -9,9 +9,41 @@
   <target name="test2">
     <copy file="copy.xml" todir="copytest1dir" overwrite="true"/>
   </target>
- 
+
+  <target name="test3">
+    <!-- create an empty file -->
+    <touch file="copytest3.tmp"/>
+    <!--wait -->
+    <sleep seconds="4"/>
+    <!-- copy a different file to two places --> 
+    <copy file="copy.xml" tofile="copytest3a.tmp" overwrite="true"/>
+    <copy file="copy.xml" tofile="copytest3b.tmp" overwrite="true"/>
+    <!--wait -->
+    <sleep seconds="4"/>
+    <!-- copy an old file onto a newer file (should not work) -->
+    <copy file="copytest3.tmp" tofile="copytest3b.tmp" />
+    <!-- copy an older file onto a new one, should succeed -->
+    <copy file="copytest3.tmp" tofile="copytest3c.tmp"
+      overwrite="true"
+      preservelastmodified="true" />
+    <!-- copy a newer file onto an older one (should work) -->
+    <copy file="copytest3a.tmp" tofile="copytest3.tmp" 
+      preservelastmodified="true" />
+    <!-- expected state :
+      3a.tmp==3.tmp==copy.xml
+      timeof(3a.tmp)==timeof(3.tmp)==now()-4
+      sizeof(3c)==0
+      timeof(3c.tmp)<timeof(3a.tmp);
+      3b.tmp==copy.xml
+    -->
+  </target>
+  
   <target name="cleanup"> 
     <delete file="copytest1.tmp"/>
+    <delete file="copytest3.tmp"/>
+    <delete file="copytest3a.tmp"/>
+    <delete file="copytest3b.tmp"/>
+    <delete file="copytest3c.tmp"/>
     <delete dir="copytest1dir"/>
   </target>