diff --git a/tests.mk b/tests.mk
new file mode 100644
index 0000000..64fc622
--- /dev/null
+++ b/tests.mk
@@ -0,0 +1,48 @@
+# Copyright 2015 The Weave Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+###
+# tests
+
+weave_test_obj_files := $(WEAVE_TEST_SRC_FILES:%.cc=out/$(BUILD_MODE)/%.o)
+
+# We don't need libgtest.a, but the headers files in third_party/include.
+$(weave_test_obj_files) : out/$(BUILD_MODE)/%.o : %.cc third_party/lib/libgtest.a
+	mkdir -p $(dir $@)
+	$(CXX) $(DEFS_$(BUILD_MODE)) $(INCLUDES) $(CFLAGS) $(CFLAGS_$(BUILD_MODE)) $(CFLAGS_CC) -c -o $@ $<
+
+out/$(BUILD_MODE)/libweave-test.a : $(weave_test_obj_files)
+	$(AR) crs $@ $^
+
+weave_unittest_obj_files := $(WEAVE_UNITTEST_SRC_FILES:%.cc=out/$(BUILD_MODE)/%.o)
+
+# We don't need libgtest.a, but the headers files in third_party/include.
+$(weave_unittest_obj_files) : out/$(BUILD_MODE)/%.o : %.cc third_party/lib/libgtest.a
+	mkdir -p $(dir $@)
+	$(CXX) $(DEFS_$(BUILD_MODE)) $(INCLUDES) $(CFLAGS) $(CFLAGS_$(BUILD_MODE)) $(CFLAGS_CC) -c -o $@ $<
+
+out/$(BUILD_MODE)/libweave_testrunner : $(weave_unittest_obj_files) $(third_party_chromium_crypto_unittest_obj_files) $(third_party_chromium_base_unittest_obj_files) out/$(BUILD_MODE)/libweave_common.a out/$(BUILD_MODE)/libweave-test.a
+	$(CXX) -o $@ $^ -lcrypto -lexpat -lgmock -lgtest -lpthread -lrt -Lthird_party/lib
+
+test : out/$(BUILD_MODE)/libweave_testrunner
+	$<
+
+###
+# export tests
+
+weave_exports_unittest_obj_files := $(WEAVE_EXPORTS_UNITTEST_SRC_FILES:%.cc=out/$(BUILD_MODE)/%.o)
+
+# We don't need libgtest.a, but the headers files in third_party/include.
+$(weave_exports_unittest_obj_files) : out/$(BUILD_MODE)/%.o : %.cc third_party/lib/libgtest.a
+	mkdir -p $(dir $@)
+	$(CXX) $(DEFS_$(BUILD_MODE)) $(INCLUDES) $(CFLAGS) $(CFLAGS_$(BUILD_MODE)) $(CFLAGS_CC) -c -o $@ $<
+
+out/$(BUILD_MODE)/libweave_exports_testrunner : $(weave_exports_unittest_obj_files) out/$(BUILD_MODE)/libweave.so out/$(BUILD_MODE)/libweave-test.a out/$(BUILD_MODE)/src/test/weave_testrunner.o
+	$(CXX) -o $@ $^ -lcrypto -lexpat -lgmock -lgtest -lpthread -lrt -Lthird_party/lib -Wl,-rpath=out/$(BUILD_MODE)/
+
+export-test : out/$(BUILD_MODE)/libweave_exports_testrunner
+	$<
+
+.PHONY : test export-test
+