diff --git a/cross-checker/tests/smoke-tests.cpp b/cross-checker/tests/smoke-tests.cpp
index 789f1b2..2021984 100644
--- a/cross-checker/tests/smoke-tests.cpp
+++ b/cross-checker/tests/smoke-tests.cpp
@@ -9,6 +9,20 @@ TEST(SmokeTest, Test1)
 }
 
 TEST(SmokeTest, Test2)
+{
+    cross_checker::Line line1(cross_checker::Point(0, 0), cross_checker::Point(1, 1));
+    cross_checker::Line line2(cross_checker::Point(2, 2), cross_checker::Point(3, 3));
+    ASSERT_FALSE(line1.intersect(line2));
+}
+
+TEST(SmokeTest, Test3)
+{
+    cross_checker::Line line1(cross_checker::Point(0, 0), cross_checker::Point(1, 1));
+    cross_checker::Line line2(cross_checker::Point(1, 1), cross_checker::Point(2, 2));
+    ASSERT_TRUE(line1.intersect(line2));
+}
+
+TEST(SmokeTest, Test4)
 {
     cross_checker::Line line1(cross_checker::Point(0, 0), cross_checker::Point(1, 1));
     cross_checker::Line line2(cross_checker::Point(2, 2), cross_checker::Point(3, 3));