diff --git a/Tests/RunCMake/CMakeLists.txt b/Tests/RunCMake/CMakeLists.txt
index 8e0c0e5b0..66f86b6e0 100644
--- a/Tests/RunCMake/CMakeLists.txt
+++ b/Tests/RunCMake/CMakeLists.txt
@@ -72,6 +72,7 @@ add_RunCMake_test(add_dependencies)
 add_RunCMake_test(build_command)
 add_RunCMake_test(find_package)
 add_RunCMake_test(get_filename_component)
+add_RunCMake_test(if)
 add_RunCMake_test(include)
 add_RunCMake_test(include_directories)
 add_RunCMake_test(list)
diff --git a/Tests/RunCMake/if/CMakeLists.txt b/Tests/RunCMake/if/CMakeLists.txt
new file mode 100644
index 000000000..e8db6b05b
--- /dev/null
+++ b/Tests/RunCMake/if/CMakeLists.txt
@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 2.8)
+project(${RunCMake_TEST} NONE)
+include(${RunCMake_TEST}.cmake)
diff --git a/Tests/RunCMake/if/IsDirectory-stdout.txt b/Tests/RunCMake/if/IsDirectory-stdout.txt
new file mode 100644
index 000000000..b89446a65
--- /dev/null
+++ b/Tests/RunCMake/if/IsDirectory-stdout.txt
@@ -0,0 +1 @@
+CMAKE_CURRENT_SOURCE_DIR exists, tested with trailing slash
diff --git a/Tests/RunCMake/if/IsDirectory.cmake b/Tests/RunCMake/if/IsDirectory.cmake
new file mode 100644
index 000000000..23d126dd4
--- /dev/null
+++ b/Tests/RunCMake/if/IsDirectory.cmake
@@ -0,0 +1,5 @@
+if(IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/")
+  message(STATUS "CMAKE_CURRENT_SOURCE_DIR exists, tested with trailing slash")
+else()
+  message(FATAL_ERROR "CMAKE_CURRENT_SOURCE_DIR does not exist!")
+endif()
diff --git a/Tests/RunCMake/if/IsDirectoryLong-stdout.txt b/Tests/RunCMake/if/IsDirectoryLong-stdout.txt
new file mode 100644
index 000000000..5e6275429
--- /dev/null
+++ b/Tests/RunCMake/if/IsDirectoryLong-stdout.txt
@@ -0,0 +1 @@
+Directory path with length 94208 correctly does not exist.
diff --git a/Tests/RunCMake/if/IsDirectoryLong.cmake b/Tests/RunCMake/if/IsDirectoryLong.cmake
new file mode 100644
index 000000000..0e93be744
--- /dev/null
+++ b/Tests/RunCMake/if/IsDirectoryLong.cmake
@@ -0,0 +1,10 @@
+set(d "/long/path/to/directory")
+foreach(i RANGE 11)
+  set(d "${d}${d}")
+endforeach()
+string(LENGTH "${d}" dl)
+if(IS_DIRECTORY "${d}/")
+  message(FATAL_ERROR "Directory should not exist!")
+else()
+  message(STATUS "Directory path with length ${dl} correctly does not exist.")
+endif()
diff --git a/Tests/RunCMake/if/RunCMakeTest.cmake b/Tests/RunCMake/if/RunCMakeTest.cmake
new file mode 100644
index 000000000..6b6b74b54
--- /dev/null
+++ b/Tests/RunCMake/if/RunCMakeTest.cmake
@@ -0,0 +1,4 @@
+include(RunCMake)
+
+run_cmake(IsDirectory)
+run_cmake(IsDirectoryLong)