add Buffer::add_cursor()

test/src/test_Buffer.cc

@@ -34,7 +34,7 @@ TEST(BufferTest, writes_an_empty_file_for_an_empty_buffer)
 TEST(BufferTest, allows_navigating_using_iterators)
 {
     Buffer b("test/files/line_endings/lf_format.txt");
-    auto iterator = b.add_iterator();
+    auto iterator = b.add_cursor();
 
     EXPECT_EQ(0u, iterator->line());
     ASSERT_EQ((uint32_t)'H', **iterator);
@@ -71,7 +71,7 @@ TEST(BufferTest, allows_navigating_using_iterators)
 TEST(BufferTest, allows_navigating_using_iterators2)
 {
     Buffer b("test/files/blank_lines.txt");
-    auto iterator = b.add_iterator();
+    auto iterator = b.add_cursor();
 
     EXPECT_EQ(0u, iterator->line());
     EXPECT_EQ((uint32_t)'a', **iterator);