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, 15 insertions, 0 deletions

diff --git a/Tests/RunCMake/PrintHelpers/rot13.c b/Tests/RunCMake/PrintHelpers/rot13.c
new file mode 100644
index 0000000..053bebd
--- /dev/null
+++ b/Tests/RunCMake/PrintHelpers/rot13.c
@@ -0,0 +1,15 @@
+#include "rot13.h"
+
+void rot13(char* in)
+{
+  char* end = in + strlen(in);
+  for (char* c = in; c < end; c++) {
+    if (*c >= 'a' && *c <= 'z') {
+      *c += (*c < 'n') ? 13 : -13;
+      continue;
+    }
+    if (*c >= 'A' && *c <= 'Z') {
+      *c += (*c < 'N') ? 13 : -13;
+    }
+  }
+}