Tests: Add tests for CMakePrintHelpers

Add three tests in Tests/RunCMake/PrintHelpers, meant to verify
basic functionality of the module. Tests are:

* Variables: Test the results of a cmake_print_variables()
  call on two variables set within the test script.

* Properties: Test cmake_print_properties() calls on a pair
  of SOURCES and a pair of TARGETS, printing some basic properties.

* PropertiesSources: Specifically verify the results of a
  cmake_print_properties() call for the SOURCES property of a
  TARGET. Prior to the fix introduced alongside these tests, it
  was a known bug that such a request caused a FATAL_ERROR.

1 files changed, 26 insertions, 0 deletions

diff --git a/Tests/RunCMake/PrintHelpers/Properties.cmake b/Tests/RunCMake/PrintHelpers/Properties.cmake
new file mode 100644
index 0000000..3e8ecd1
--- /dev/null
+++ b/Tests/RunCMake/PrintHelpers/Properties.cmake
@@ -0,0 +1,26 @@
+enable_language(C)
+
+set_property(SOURCE nothing.c PROPERTY LANGUAGE C)
+set_property(SOURCE something.c PROPERTY
+  COMPILE_DEFINITIONS SOMETHING=1)
+
+add_library(nothing STATIC nothing.c nothing.h)
+
+add_executable(something something.c something.h)
+target_link_libraries(something PUBLIC nothing)
+
+include(CMakePrintHelpers)
+
+cmake_print_properties(
+  TARGETS nothing something
+  PROPERTIES
+    LINKER_LANGUAGE
+    TYPE
+)
+
+cmake_print_properties(
+  SOURCES nothing.c something.c
+  PROPERTIES
+    COMPILE_DEFINITIONS
+    LANGUAGE
+)