Tests: Add contract test for PLplot

Tests/CMakeLists.txt

@@ -3396,6 +3396,7 @@ ${CMake_BINARY_DIR}/bin/cmake -DDIR=dev -P ${CMake_SOURCE_DIR}/Utilities/Release
   # sets "CMake_TEST_CONTRACT_<project>_<var>" variables to configure
   # the code below.
   foreach(project
+      PLplot
       Trilinos
       VTK
       )

Tests/Contracts/PLplot/CMakeLists.txt

@@ -0,0 +1,18 @@
+cmake_minimum_required(VERSION 3.9)
+project(PLplotDriver NONE)
+include(ExternalProject)
+include(${CMAKE_CURRENT_SOURCE_DIR}/../Home.cmake)
+set(PLplot_PREFIX "${HOME}/.cmake/Contracts/PLplot")
+file(REMOVE_RECURSE "${PLplot_PREFIX}")
+separate_arguments(PLplot_CMAKE_ARGS UNIX_COMMAND "${PLplot_CMAKE_FLAGS}")
+if(NOT PLplot_GIT_TAG)
+  set(PLplot_GIT_TAG "plplot-5.13.0")
+endif()
+ExternalProject_Add(PLplot
+  GIT_REPOSITORY "https://git.code.sf.net/p/plplot/plplot.git"
+  GIT_TAG "${PLplot_GIT_TAG}"
+  PREFIX "${PLplot_PREFIX}"
+  CMAKE_ARGS
+    -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
+    ${PLplot_CMAKE_ARGS}
+  )

Tests/Contracts/PLplot/Configure.cmake

@@ -0,0 +1,4 @@
+set(Contracts.PLplot_BUILD_OPTIONS
+  -DPLplot_CMAKE_FLAGS=${CMake_TEST_CONTRACT_PLplot_CMAKE_FLAGS}
+  -DPLplot_GIT_TAG=${CMake_TEST_CONTRACT_PLplot_GIT_TAG}
+  )