add github workflow to run tests

.github/workflows/main.yml

@@ -0,0 +1,18 @@
+name: CI
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+  workflow_dispatch:
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup Zig
+        uses: goto-bus-stop/setup-zig@v1.3.0
+        with:
+          version: master
+      - name: Tests
+        run: ./test.sh

.gitignore

@@ -2,3 +2,6 @@ zig-cache/
 zig-out/
 .zigmod
 deps.zig
+/test.in
+/test.out
+/test.expect

test.sh

@@ -0,0 +1,67 @@
+#!/usr/bin/env bash
+
+set -e
+
+echo "Unit tests..."
+zig build test
+
+echo "Build..."
+zig build
+
+echo -n "Created: "
+ls zig-out/bin/skip
+export PATH=$PWD/zig-out/bin/:$PATH
+
+echo "> skip a line when reading from stdin"
+INPUT=$(cat<<EOF
+line 1
+line 2
+EOF
+)
+echo "line 2" > test.expect
+echo "$INPUT" | skip 1 > test.out
+diff --brief test.expect test.out
+
+echo "> skip a line when reading from a file"
+cat<<EOF > test.in
+line 1
+line 2
+EOF
+echo "line 2" > test.expect
+skip 1 test.in > test.out
+diff --brief test.expect test.out
+
+echo "> skip until 2 matching lines seen"
+cat<<EOF > test.in
+alpha
+beta
+alpha
+gamma
+EOF
+echo "gamma" > test.expect
+skip 2 test.in --line alpha > test.out
+diff --brief test.expect test.out
+
+echo "> skip lines until 2 tokens seen"
+cat<<EOF > test.in
+Lorem ipsum dolor sit amet, 
+consectetur adipiscing elit, 
+sed do eiusmod tempor incididunt 
+ut labore et dolore magna aliqua. 
+Ut enim ad minim veniam, 
+quis nostrud exercitation ullamco 
+laboris nisi ut aliquip ex ea 
+commodo consequat. 
+EOF
+cat<<EOF > test.expect
+Ut enim ad minim veniam, 
+quis nostrud exercitation ullamco 
+laboris nisi ut aliquip ex ea 
+commodo consequat. 
+EOF
+skip 2 test.in --token dolor > test.out
+diff --brief test.expect test.out
+
+rm test.in test.out test.expect
+
+echo done