Add t/101-removed-todo-lines-not-included.t

Test that removed TODO lines don't appear in the command's output.

This currently gives the following error:

    thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', src/main.rs:39:43
    note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
    thread 'main' panicked at 'Box<Any>', $HOME/.cargo/registry/src/github.com-1ecc6299db9ec823/git2-0.13.11/src/panic.rs:27:9

1 files changed, 48 insertions, 0 deletions

diff --git a/t/101-removed-todo-lines-not-included.t b/t/101-removed-todo-lines-not-included.t
new file mode 100644
index 0000000..5a0fec4
--- /dev/null
+++ b/t/101-removed-todo-lines-not-included.t
@@ -0,0 +1,48 @@
+#!/usr/bin/env perl -w
+
+use strict;
+
+use File::Copy;
+use Test::More;
+
+use Bin qw($BIN);
+
+my $file = 'git-sugdiff.rs';
+
+chdir 't-git-repo' or die $!;
+
+system('git checkout -b fork-point');
+ok !$?;
+
+open(my $input, '<', $file) or die $!;
+open(my $output, '>', "$file.out") or die $!;
+
+while (<$input>) {
+	if ($_ eq "// TODO: one\n") {
+		next;
+	}
+
+	print $output $_;
+}
+
+close $input;
+close $output;
+
+move("$file.out", $file) or die $!;
+
+system('git add git-sugdiff.rs');
+ok !$?;
+
+system('git commit -m "New TODO"');
+ok !$?;
+
+my $todos = qx($BIN);
+is $todos, '';
+
+
+# Teardown
+system('git checkout master');
+system('git branch -D fork-point');
+
+
+done_testing;