CheckIncludeFiles: add unit tests

Tests/RunCMake/CheckModules/CheckIncludeFilesMissingLanguage-result.txt

@@ -0,0 +1 @@
+1

Tests/RunCMake/CheckModules/CheckIncludeFilesMissingLanguage-stderr.txt

@@ -0,0 +1,8 @@
+CMake Error at .*/Modules/CheckIncludeFiles.cmake:[0-9]+. \(message\):
+  Unknown arguments:
+
+    LANGUAGE
+
+Call Stack \(most recent call first\):
+  CheckIncludeFilesMissingLanguage.cmake:[0-9]+ \(check_include_files\)
+  CMakeLists.txt:[0-9]+ \(include\)

Tests/RunCMake/CheckModules/CheckIncludeFilesMissingLanguage.cmake

@@ -0,0 +1,3 @@
+enable_language(C)
+include(CheckIncludeFiles)
+check_include_files("stddef.h;stdlib.h" HAVE_MISSING_ARGUMENT_H LANGUAGE)

Tests/RunCMake/CheckModules/CheckIncludeFilesOk.cmake

@@ -0,0 +1,6 @@
+enable_language(C)
+enable_language(CXX)
+include(CheckIncludeFiles)
+check_include_files("stddef.h;stdlib.h" HAVE_STDLIB_H)
+check_include_files("stddef.h;stdlib.h" HAVE_STDLIB_H2 LANGUAGE C)
+check_include_files("cstddef;cstdlib" HAVE_CSTDLIB_H LANGUAGE CXX)

Tests/RunCMake/CheckModules/CheckIncludeFilesOkNoC.cmake

@@ -0,0 +1,4 @@
+enable_language(CXX)
+include(CheckIncludeFiles)
+check_include_files("cstddef;cstdlib" HAVE_CSTDLIB_H3 LANGUAGE CXX)
+check_include_files("cstddef;cstdlib" HAVE_CSTDLIB_H4)

Tests/RunCMake/CheckModules/CheckIncludeFilesUnknownArgument-result.txt

@@ -0,0 +1 @@
+1

Tests/RunCMake/CheckModules/CheckIncludeFilesUnknownArgument-stderr.txt

@@ -0,0 +1,8 @@
+CMake Error at .*/Modules/CheckIncludeFiles.cmake:[0-9]+. \(message\):
+  Unknown arguments:
+
+    FOOBAR
+
+Call Stack \(most recent call first\):
+  CheckIncludeFilesUnknownArgument.cmake:[0-9]+ \(check_include_files\)
+  CMakeLists.txt:[0-9]+ \(include\)

Tests/RunCMake/CheckModules/CheckIncludeFilesUnknownArgument.cmake

@@ -0,0 +1,3 @@
+enable_language(C)
+include(CheckIncludeFiles)
+check_include_files("stddef.h;stdlib.h" HAVE_UNKNOWN_ARGUMENT_H FOOBAR)

Tests/RunCMake/CheckModules/CheckIncludeFilesUnknownLanguage-result.txt

@@ -0,0 +1 @@
+1

Tests/RunCMake/CheckModules/CheckIncludeFilesUnknownLanguage-stderr.txt

@@ -0,0 +1,10 @@
+CMake Error at .*/Modules/CheckIncludeFiles.cmake:[0-9]+. \(message\):
+  Unknown language:
+
+    FOOBAR
+
+  Supported languages: C, CXX.
+
+Call Stack \(most recent call first\):
+  CheckIncludeFilesUnknownLanguage.cmake:[0-9]+ \(check_include_files\)
+  CMakeLists.txt:[0-9]+ \(include\)

Tests/RunCMake/CheckModules/CheckIncludeFilesUnknownLanguage.cmake

@@ -0,0 +1,3 @@
+enable_language(C)
+include(CheckIncludeFiles)
+check_include_files("stddef.h;stdlib.h" HAVE_UNKNOWN_ARGUMENT_H LANGUAGE FOOBAR)

Tests/RunCMake/CheckModules/RunCMakeTest.cmake

@@ -14,3 +14,9 @@ run_cmake(CheckTypeSizeUnknownArgument)
 run_cmake(CheckTypeSizeMixedArgs)
 
 run_cmake(CheckTypeSizeOkNoC)
+
+run_cmake(CheckIncludeFilesOk)
+run_cmake(CheckIncludeFilesOkNoC)
+run_cmake(CheckIncludeFilesMissingLanguage)
+run_cmake(CheckIncludeFilesUnknownArgument)
+run_cmake(CheckIncludeFilesUnknownLanguage)