Add some tests for #469

Author: scottchiefbaker

test/bugs.bats

@@ -75,3 +75,9 @@ teardown_file() {
   run printf "%s" "$output"
   assert_line --index 3 --partial  "@ height"
 }
+
+@test "ANSI Reset without the zero (#469)" {
+  output=$( load_fixture "ansi_reset_no_number" | $diff_so_fancy )
+  run printf "%s" "$output"
+  assert_line --index 5 --partial  "History"
+}

test/fixtures/ansi_reset_no_number.diff

@@ -0,0 +1,9 @@
+diff --git a/history.md b/history.md
+index f6776e0..a6b4546 100644
+--- a/history.md
++++ b/history.md
+@@ -1,3 +1,3 @@
+-## History
++## Historyz
+ 
+ `diff-so-fancy` started as [a commit in paulirish's dotfiles](https://github.com/paulirish/dotfiles/commit/6743b907ff586c28cd36e08d1e1c634e2968893e#commitcomment-13349456), which grew into a [standalone script](https://github.com/paulirish/dotfiles/blob/63cb8193b0e66cf80ab6332477f1f52c7fbb9311/bin/diff-so-fancy). Later, [@stevemao](https://github.com/stevemao) brought it into its [own repo](https://github.com/so-fancy/diff-so-fancy) (here), and gave it the room to mature. It's quickly grown into a [widely collaborative project](https://github.com/so-fancy/diff-so-fancy/graphs/contributors).