Tests: Factor out common helper in RunCMake.file-DOWNLOAD cases

Tests/RunCMake/file-DOWNLOAD/common.cmake

@@ -0,0 +1,15 @@
+if(NOT "${CMAKE_CURRENT_SOURCE_DIR}" MATCHES "^/")
+  set(slash /)
+endif()
+set(url "file://${slash}${CMAKE_CURRENT_SOURCE_DIR}/input.png")
+set(file ${CMAKE_CURRENT_BINARY_DIR}/output.png)
+
+function(file_download)
+  file(DOWNLOAD "${url}"
+    ${file} # leave unquoted
+    TIMEOUT 30
+    STATUS status
+    ${ARGN}
+    )
+  message(STATUS "status='${status}'")
+endfunction()

Tests/RunCMake/file-DOWNLOAD/hash-mismatch-stderr.txt

@@ -1,11 +1,11 @@
 ^CMake Error at hash-mismatch.cmake:[0-9]+ \(file\):
   file DOWNLOAD HASH mismatch
 
-    for file: \[.*/Tests/RunCMake/file-DOWNLOAD/hash-mismatch-build/hash-mismatch.txt\]
+    for file: \[.*/Tests/RunCMake/file-DOWNLOAD/hash-mismatch-build/output.png\]
       expected hash: \[0123456789abcdef0123456789abcdef01234567\]
-        actual hash: \[da39a3ee5e6b4b0d3255bfef95601890afd80709\]
+        actual hash: \[67eee17f79d9ac557284fc0b8ad19f25723fb578\]
 
 Call Stack \(most recent call first\):
   CMakeLists.txt:[0-9]+ \(include\)
 +
-status='1;HASH mismatch: expected: 0123456789abcdef0123456789abcdef01234567 actual: da39a3ee5e6b4b0d3255bfef95601890afd80709'$
+status='1;HASH mismatch: expected: 0123456789abcdef0123456789abcdef01234567 actual: 67eee17f79d9ac557284fc0b8ad19f25723fb578'$

Tests/RunCMake/file-DOWNLOAD/hash-mismatch.cmake

@@ -1,10 +1,8 @@
-if(NOT "${CMAKE_CURRENT_SOURCE_DIR}" MATCHES "^/")
-  set(slash /)
-endif()
-file(DOWNLOAD
-  "file://${slash}${CMAKE_CURRENT_SOURCE_DIR}/hash-mismatch.txt"
-  ${CMAKE_CURRENT_BINARY_DIR}/hash-mismatch.txt
+include(common.cmake)
+
+file(DOWNLOAD ${url} ${file}
   EXPECTED_HASH SHA1=0123456789abcdef0123456789abcdef01234567
+  TIMEOUT 30
   STATUS status
   )
 message("status='${status}'")

Tests/RunCMake/file-DOWNLOAD/no-save-hash-stderr.txt

@@ -1,4 +1,5 @@
-^CMake Error at no-save-hash\.cmake:[0-9]+ \(file\):
+^CMake Error at common\.cmake:[0-9]+ \(file\):
   file DOWNLOAD cannot calculate hash if file is not saved\.
 Call Stack \(most recent call first\):
+  no-save-hash.cmake:[0-9]+ \(file_download\)
   CMakeLists\.txt:[0-9]+ \(include\)$

Tests/RunCMake/file-DOWNLOAD/no-save-hash.cmake

@@ -1,8 +1,5 @@
-if(NOT "${CMAKE_CURRENT_SOURCE_DIR}" MATCHES "^/")
-  set(slash /)
-endif()
-file(DOWNLOAD
-  "file://${slash}${CMAKE_CURRENT_SOURCE_DIR}/no-save-md5.txt"
-  EXPECTED_HASH MD5=55555555555555555555555555555555
-  STATUS status
-  )
+include(common.cmake)
+
+# Test downloading without saving to a file.
+set(file "")
+file_download(EXPECTED_HASH MD5=55555555555555555555555555555555)

Tests/RunCMake/file-DOWNLOAD/unused-argument-stderr.txt

@@ -1,5 +1,6 @@
-^CMake Warning \(dev\) at unused-argument.cmake:[0-9]+ \(file\):
+^CMake Warning \(dev\) at common.cmake:[0-9]+ \(file\):
   Unexpected argument: JUNK
 Call Stack \(most recent call first\):
+  unused-argument.cmake:[0-9]+ \(file_download\)
   CMakeLists.txt:[0-9]+ \(include\)
 This warning is for project developers.  Use -Wno-dev to suppress it.$

Tests/RunCMake/file-DOWNLOAD/unused-argument.cmake

@@ -1,8 +1,3 @@
-if(NOT "${CMAKE_CURRENT_SOURCE_DIR}" MATCHES "^/")
-  set(slash /)
-endif()
-file(DOWNLOAD
-  "file://${slash}${CMAKE_CURRENT_SOURCE_DIR}/unused-argument.txt"
-  "${CMAKE_CURRENT_BINARY_DIR}/unused-argument.txt"
-  JUNK
-  )
+include(common.cmake)
+
+file_download(JUNK)