Add make commands for tests

This adds the make commands required to build and run tests.

.gitignore

@@ -80,4 +80,11 @@ tags
 target
 *.swp
 
+# cpp tests and gcov generated files
+*.gcov
+*.gcda
+*.gcno
+build_tests
+/tests/cpp/xgboost_test
+
 .DS_Store

Makefile

@@ -101,6 +101,7 @@ AMALGA_OBJ = amalgamation/xgboost-all0.o
 LIB_DEP = $(DMLC_CORE)/libdmlc.a $(RABIT)/lib/$(LIB_RABIT)
 ALL_DEP = $(filter-out build/cli_main.o, $(ALL_OBJ)) $(LIB_DEP)
 CLI_OBJ = build/cli_main.o
+include tests/cpp/xgboost_test.mk
 
 build/%.o: src/%.cc
 	@mkdir -p $(@D)
@@ -145,8 +146,15 @@ lint: rcpplint
 pylint:
 	flake8 --ignore E501 python-package
 	flake8 --ignore E501 tests/python
+
+test: $(ALL_TEST)
+
+check: test
+	./tests/cpp/xgboost_test
+
 clean:
 	$(RM) -rf build build_plugin lib bin *~ */*~ */*/*~ */*/*/*~ */*.o */*/*.o */*/*/*.o xgboost
+	$(RM) -rf build_tests tests/cpp/xgboost_test
 
 clean_all: clean
 	cd $(DMLC_CORE); $(MAKE) clean; cd $(ROOTDIR)

make/config.mk

@@ -47,6 +47,10 @@ LIB_RABIT = librabit.a
 # path to libjvm.so
 LIBJVM=$(JAVA_HOME)/jre/lib/amd64/server
 
+# path to gtest library (only used when $BUILD_TEST=1)
+# there should be an include path in $GTEST_PATH/include and library in $GTEST_PATH/lib
+GTEST_PATH =
+
 # List of additional plugins, checkout plugin folder.
 # uncomment the following lines to include these plugins
 # you can also add your own plugin like this

tests/cpp/data/test_metainfo.cc

@@ -0,0 +1,34 @@
+// Copyright by Contributors
+#include <xgboost/data.h>
+#include <gtest/gtest.h>
+
+TEST(MetaInfo, GetSet) {
+  xgboost::MetaInfo info;
+
+  double double2[2] = {1.0, 2.0};
+  EXPECT_EQ(info.GetRoot(1), 0)
+    << "When no root_index is given, was expecting default value 0";
+  info.SetInfo("root_index", double2, xgboost::kDouble, 2);
+  EXPECT_EQ(info.GetRoot(1), 2.0f);
+
+  EXPECT_EQ(info.labels.size(), 0);
+  info.SetInfo("label", double2, xgboost::kFloat32, 2);
+  EXPECT_EQ(info.labels.size(), 2);
+
+  float float2[2] = {1.0f, 2.0f};
+  EXPECT_EQ(info.GetWeight(1), 1.0f)
+    << "When no weights are given, was expecting default value 1";
+  info.SetInfo("weight", float2, xgboost::kFloat32, 2);
+  EXPECT_EQ(info.GetWeight(1), 2.0f);
+
+  uint32_t uint32_t2[2] = {1U, 2U};
+  EXPECT_EQ(info.base_margin.size(), 0);
+  info.SetInfo("base_margin", uint32_t2, xgboost::kUInt32, 2);
+  EXPECT_EQ(info.base_margin.size(), 2);
+
+  uint64_t uint64_t2[2] = {1U, 2U};
+  EXPECT_EQ(info.group_ptr.size(), 0);
+  info.SetInfo("group", uint64_t2, xgboost::kUInt64, 2);
+  ASSERT_EQ(info.group_ptr.size(), 3);
+  EXPECT_EQ(info.group_ptr[2], 3);
+}

tests/cpp/test_main.cc

@@ -0,0 +1,8 @@
+// Copyright by Contributors
+#include <gtest/gtest.h>
+
+int main(int argc, char ** argv) {
+  testing::InitGoogleTest(&argc, argv);
+  testing::FLAGS_gtest_death_test_style = "threadsafe";
+  return RUN_ALL_TESTS();
+}

tests/cpp/xgboost_test.mk

@@ -0,0 +1,23 @@
+UTEST_ROOT=tests/cpp
+UTEST_OBJ_ROOT=build_$(UTEST_ROOT)
+UNITTEST=$(UTEST_ROOT)/xgboost_test
+UNITTEST_SRC=$(wildcard $(UTEST_ROOT)/*.cc $(UTEST_ROOT)/*/*.cc)
+UNITTEST_OBJ=$(patsubst $(UTEST_ROOT)%.cc, $(UTEST_OBJ_ROOT)%.o, $(UNITTEST_SRC))
+
+GTEST_LIB=$(GTEST_PATH)/lib/
+GTEST_INC=$(GTEST_PATH)/include/
+
+UNITTEST_CFLAGS=$(CFLAGS)
+UNITTEST_LDFLAGS=$(LDFLAGS) -L$(GTEST_LIB) -lgtest
+UNITTEST_DEPS=lib/libxgboost.a $(DMLC_CORE)/libdmlc.a $(RABIT)/lib/$(LIB_RABIT)
+
+$(UTEST_OBJ_ROOT)/%.o: $(UTEST_ROOT)/%.cc
+	@mkdir -p $(@D)
+	$(CXX) $(UNITTEST_CFLAGS) -I$(GTEST_INC) -o $@ -c $<
+
+$(UNITTEST): $(UNITTEST_OBJ) $(UNITTEST_DEPS)
+	$(CXX) $(UNITTEST_CFLAGS) -o $@ $^ $(UNITTEST_LDFLAGS)
+
+
+ALL_TEST=$(UNITTEST)
+ALL_TEST_OBJ=$(UNITTEST_OBJ)