diff --git a/Makefile b/Makefile
index fc81452..19e4d48 100644
--- a/Makefile
+++ b/Makefile
@@ -46,6 +46,7 @@ dist:
 		$(PACKAGE)-$(VERSION)/src/common.h \
 		$(PACKAGE)-$(VERSION)/src/parser.h \
 		$(PACKAGE)-$(VERSION)/src/project.conf \
+		$(PACKAGE)-$(VERSION)/tests/define.cpp \
 		$(PACKAGE)-$(VERSION)/tests/if.cpp \
 		$(PACKAGE)-$(VERSION)/tests/Makefile \
 		$(PACKAGE)-$(VERSION)/tests/cpp.sh \
diff --git a/tests/Makefile b/tests/Makefile
index 3ada9d6..100ea7e 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,4 +1,4 @@
-TARGETS	= if.o
+TARGETS	= define.o if.o
 PREFIX	= /usr/local
 DESTDIR	=
 BINDIR	= $(PREFIX)/bin
@@ -13,14 +13,20 @@ INSTALL	= install
 
 all: $(TARGETS)
 
+define.o_OBJS = define.o
+define.o_CXXFLAGS = $(CPPFLAGSF) $(CPPFLAGS) $(CXXFLAGS)
+
 if.o_OBJS = if.o
 if.o_CXXFLAGS = $(CPPFLAGSF) $(CPPFLAGS) $(CXXFLAGS)
 
+define.o: define.cpp cpp.sh
+	$(CXX) $(define.o_CXXFLAGS) -c define.cpp
+
 if.o: if.cpp cpp.sh
 	$(CXX) $(if.o_CXXFLAGS) -c if.cpp
 
 clean:
-	$(RM) -- $(if.o_OBJS)
+	$(RM) -- $(define.o_OBJS) $(if.o_OBJS)
 
 distclean: clean
 	$(RM) -- $(TARGETS)
diff --git a/tests/define.cpp b/tests/define.cpp
new file mode 100644
index 0000000..dec4e33
--- /dev/null
+++ b/tests/define.cpp
@@ -0,0 +1,25 @@
+#ifdef GOOD
+#error error
+#endif
+
+#define GOOD 1
+
+#ifdef GOOD
+#warning good
+#else
+#error error
+#endif
+
+#ifndef GOOD
+#error error
+#else
+#warning good
+#endif
+
+#undef GOOD
+
+#ifndef GOOD
+#warning good
+#else
+#error error
+#endif
diff --git a/tests/define.o b/tests/define.o
new file mode 100644
index 0000000..2948242
--- /dev/null
+++ b/tests/define.o
@@ -0,0 +1 @@
+#define GOOD 1 2
diff --git a/tests/if.o b/tests/if.o
new file mode 100644
index 0000000..45e074c
--- /dev/null
+++ b/tests/if.o
@@ -0,0 +1,31 @@
+#if 0
+#warning good
+#endif
+
+#if 1
+#warning good
+#else
+
+#define GOOD 1
+#if GOOD
+#warning good
+#else
+#undef GOOD
+
+#define GOOD 0
+#if !GOOD
+#warning good
+#else
+#undef GOOD
+
+#define GOOD 1
+#if 0
+#warning good
+#endif
+#undef GOOD
+
+#define GOOD 0
+#if 0
+#warning good
+#endif
+#undef GOOD
diff --git a/tests/project.conf b/tests/project.conf
index 6aab9fb..fdf41bb 100644
--- a/tests/project.conf
+++ b/tests/project.conf
@@ -1,8 +1,15 @@
-targets=if.o
+targets=define.o,if.o
 cxx=./cpp.sh
 cxxflags=
 dist=Makefile,cpp.sh
 
+[define.o]
+type=object
+sources=define.cpp
+
+[define.cpp]
+depends=cpp.sh
+
 [if.o]
 type=object
 sources=if.cpp