Moved sim/ to test/simulator

All test code will be in test/. The simulator will be a subdirectory and
separate for all of the other unit test code.

Change-Id: I18c787c8180a93e09b91c74968284062391d915d
diff --git a/test/simulator/meson.build b/test/simulator/meson.build
new file mode 100644
index 0000000..4f72f2e
--- /dev/null
+++ b/test/simulator/meson.build
@@ -0,0 +1,10 @@
+sim_sources = [
+    'hei_sim_main.cpp',
+    '../../src/hei_isolator.cpp'
+]
+
+sim = executable('simulator', sim_sources, \
+                    include_directories: incdir)
+
+test('simulator', sim)
+