feat: tests

.gitignore

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+test*/

Dockerfile

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+FROM docker.io/debian:12-slim
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        imagemagick \
+        zenity \
+    && rm -rf /var/lib/apt/lists/*
+COPY compress /usr/local/bin/
+CMD ["compress", "/images/"]

compose.yaml

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+---
+services:
+  app:
+    build: .
+    environment:
+      - DISPLAY=$DISPLAY
+      - XAUTHORITY=/.Xauthority
+    volumes:
+      - ./test/:/images/:ro
+      - ./test_1080p/:/images_1080p/
+      - "$XAUTHORITY:/.Xauthority:ro"
+      - "/tmp/.X11-unix/:/tmp/.X11-unix/"

test.sh

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+#!/bin/bash -e
+
+mkdir -p test test_1080p
+
+gm convert -size 3840x2160 xc:black test/000.png
+
+printf '%s\n' {001..127} | xargs -P0 -I'{}' cp test/000.png test/'{}'.png