Tests: Fix CMake.FileDownload test failures not reported

Because the PASS_REGULAR_EXPRESSION test property is set,
the exit code of the test is ignored, so we can't just rely on using
message(SEND_ERROR) or the command itself failing. We have to
add an explicit error message for all unexpected status codes
and check for such messages with a FAIL_REGULAR_EXPRESSION.

Tests/CMakeTests/CMakeLists.txt

@@ -33,8 +33,9 @@ AddCMakeTest(While "")
 AddCMakeTest(CMakeHostSystemInformation "")
 
 AddCMakeTest(FileDownload "")
-set_property(TEST CMake.FileDownload PROPERTY
+set_tests_properties(CMake.FileDownload PROPERTIES
   PASS_REGULAR_EXPRESSION "file already exists with expected MD5 sum"
+  FAIL_REGULAR_EXPRESSION "Unexpected status"
   )
 AddCMakeTest(FileDownloadBadHash "")
 set_property(TEST CMake.FileDownloadBadHash PROPERTY

Tests/CMakeTests/FileDownloadTest.cmake.in

@@ -11,20 +11,40 @@ endif()
 set(url "file://${slash}@CMAKE_CURRENT_SOURCE_DIR@/FileDownloadInput.png")
 set(dir "@CMAKE_CURRENT_BINARY_DIR@/downloads")
 
+# Beware Windows asynchronous file/directory removal, rename and then
+# remove the renamed dir so we can be certain the dir isn't there when
+# we get to the file() commands below
+if(EXISTS "${dir}")
+  file(RENAME ${dir} "${dir}_beingRemoved")
+  file(REMOVE_RECURSE "${dir}_beingRemoved")
+endif()
+
+function(__reportIfWrongStatus statusPair expectedStatusCode)
+  list(GET statusPair 0 statusCode)
+  if(NOT statusCode EQUAL expectedStatusCode)
+    message(SEND_ERROR
+            "Unexpected status: ${statusCode}, expected: ${expectedStatusCode}")
+  endif()
+endfunction()
+
 message(STATUS "FileDownload:1")
 file(DOWNLOAD
   ${url}
   ${dir}/file1.png
   TIMEOUT ${timeout}
+  STATUS status
   )
+__reportIfWrongStatus("${status}" 0)
 
 message(STATUS "FileDownload:2")
 file(DOWNLOAD
   ${url}
   ${dir}/file2.png
   TIMEOUT ${timeout}
+  STATUS status
   SHOW_PROGRESS
   )
+__reportIfWrongStatus("${status}" 0)
 
 # Two calls in a row, exactly the same arguments.
 # Since downloaded file should exist already for 2nd call,
@@ -39,8 +59,10 @@ file(DOWNLOAD
   ${url}
   ${dir}/file3.png
   TIMEOUT ${timeout}
+  STATUS status
   EXPECTED_MD5 dbd330d52f4dbd60115d4191904ded92
   )
+__reportIfWrongStatus("${status}" 0)
 
 message(STATUS "FileDownload:4")
 file(DOWNLOAD
@@ -50,6 +72,7 @@ file(DOWNLOAD
   STATUS status
   EXPECTED_HASH SHA1=67eee17f79d9ac557284fc0b8ad19f25723fb578
   )
+__reportIfWrongStatus("${status}" 0)
 
 message(STATUS "FileDownload:5")
 file(DOWNLOAD
@@ -59,6 +82,7 @@ file(DOWNLOAD
   STATUS status
   EXPECTED_HASH SHA224=ba283726bbb602776818b463943189afd91836cb7ee5dd6e2c7b5ae4
   )
+__reportIfWrongStatus("${status}" 0)
 
 message(STATUS "FileDownload:6")
 file(DOWNLOAD
@@ -68,6 +92,7 @@ file(DOWNLOAD
   STATUS status
   EXPECTED_HASH SHA256=cf3334b1275071e1da6e8c396ccb72cf1b2388d8c937526f3af26230affb9423
   )
+__reportIfWrongStatus("${status}" 0)
 
 message(STATUS "FileDownload:7")
 file(DOWNLOAD
@@ -77,6 +102,7 @@ file(DOWNLOAD
   STATUS status
   EXPECTED_HASH SHA384=43a5d13978d97c660db44481aee0604cb4ff6ca0775cd5c2cd68cd8000e107e507c4caf6c228941231041e282ffb8950
   )
+__reportIfWrongStatus("${status}" 0)
 
 message(STATUS "FileDownload:8")
 file(DOWNLOAD
@@ -86,6 +112,8 @@ file(DOWNLOAD
   STATUS status
   EXPECTED_HASH SHA512=6984e0909a1018030ccaa418e3be1654223cdccff0fe6adc745f9aea7e377f178be53b9fc7d54a6f81c2b62ef9ddcd38ba1978fedf4c5e7139baaf355eefad5b
   )
+__reportIfWrongStatus("${status}" 0)
+
 message(STATUS "FileDownload:9")
 file(DOWNLOAD
   ${url}
@@ -94,6 +122,7 @@ file(DOWNLOAD
   STATUS status
   EXPECTED_HASH MD5=dbd330d52f4dbd60115d4191904ded92
   )
+__reportIfWrongStatus("${status}" 0)
 
 message(STATUS "FileDownload:10")
 file(DOWNLOAD
@@ -103,6 +132,8 @@ file(DOWNLOAD
   STATUS status
   EXPECTED_MD5 dbd330d52f4dbd60115d4191904ded92
   )
+__reportIfWrongStatus("${status}" 0)
+# Print status because we check its message too
 message(STATUS "${status}")
 
 message(STATUS "FileDownload:11")
@@ -113,7 +144,4 @@ file(DOWNLOAD
   STATUS status
   )
 message(STATUS "${status}")
-list(GET status 0 status_code)
-if(NOT ${status_code} EQUAL 6)
-  message(SEND_ERROR "error: expected status code 6 for bad host name, got: ${status_code}")
-endif()
+__reportIfWrongStatus("${status}" 6) # 6 corresponds to an unresolvable host name