Add a test for workplane request.

test/CMakeLists.txt

@@ -58,6 +58,7 @@ set(testsuite_SOURCES
     request/image/test.cpp
     request/line_segment/test.cpp
     request/ttf_text/test.cpp
+    request/workplane/test.cpp
     group/link/test.cpp
     group/translate_asy/test.cpp
     group/translate_nd/test.cpp

test/request/workplane/test.cpp

@@ -0,0 +1,17 @@
+#include "harness.h"
+
+TEST_CASE(normal_roundtrip) {
+    CHECK_LOAD("normal.slvs");
+    CHECK_RENDER("normal.png");
+    CHECK_SAVE("normal.slvs");
+}
+
+TEST_CASE(normal_migrate_from_v20) {
+    CHECK_LOAD("normal_v20.slvs");
+    CHECK_SAVE("normal.slvs");
+}
+
+TEST_CASE(normal_migrate_from_v22) {
+    CHECK_LOAD("normal_v22.slvs");
+    CHECK_SAVE("normal.slvs");
+}