test Buffer::Iterator::go_{start,end}_of_line() on blank lines

test/src/test_Buffer.cc

@@ -80,6 +80,18 @@ TEST(BufferTest, allows_navigating_using_iterators2)
     EXPECT_EQ(1u, iterator->line());
     EXPECT_EQ((uint32_t)'\n', **iterator);
 
+    EXPECT_FALSE(iterator->go_start_of_line());
+    EXPECT_EQ(1u, iterator->line());
+    EXPECT_EQ((uint32_t)'\n', **iterator);
+
+    EXPECT_FALSE(iterator->go_end_of_line(false));
+    EXPECT_EQ(1u, iterator->line());
+    EXPECT_EQ((uint32_t)'\n', **iterator);
+
+    EXPECT_FALSE(iterator->go_end_of_line(true));
+    EXPECT_EQ(1u, iterator->line());
+    EXPECT_EQ((uint32_t)'\n', **iterator);
+
     EXPECT_TRUE(iterator->go_next_line());
     EXPECT_EQ(2u, iterator->line());
     EXPECT_EQ((uint32_t)'d', **iterator);