run tests in Docker container / generate goldens

docker/Dockerfile

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+FROM ubuntu:20.04
+
+ARG DEBIAN_FRONTEND=noninteractive
+ENV TZ=Europe/Paris
+RUN apt update && apt install -y curl git unzip xz-utils zip libglu1-mesa openjdk-8-jdk wget
+
+RUN useradd -ms /bin/bash developer
+USER developer
+WORKDIR /home/developer
+
+ARG flutter_version
+RUN git clone https://github.com/flutter/flutter.git -b ${flutter_version}
+ENV PATH "$PATH:/home/developer/flutter/bin"
+
+RUN flutter doctor

docker/README.md

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+To build the docker image used for creating goldens, use:
+
+```docker build --build-arg flutter_version=<flutter-version> -t docker_tests docker/```
+
+Where **flutter-version** is obtained using `flutter --version`

docker/docker_test.sh

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+#!/usr/bin/env bash
+packagePath=${PACKAGE_PATH:-}
+testPath=${TEST_PATH:-}
+updateGoldens=${UPDATE_GOLDENS:-}
+coverage=${COVERAGE:-}
+
+while [ $# -gt 0 ]; do
+   if [ "$1" == "--update-goldens" ]; then
+        declare= updateGoldens="--update-goldens"
+        shift
+   elif [ "$1" == "--coverage" ]; then
+        declare= coverage="--coverage"
+        shift
+   elif [[ $1 == *"--"* ]]; then
+        param="${1/--/}"
+        declare $param="$2"
+        shift
+        shift
+   else
+        shift
+   fi
+done
+
+cd $packagePath
+flutter test $testPath $updateGoldens $coverage --no-pub --test-randomize-ordering-seed random
+exit 

update_goldens.sh

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+project_dir=$(git rev-parse --show-toplevel)
+
+flutter_dir=$(which flutter | rev | cut -c12- | rev)
+
+flutter_cache=~/.pub-cache/hosted/pub.dev/
+
+docker run --rm -ti -v $project_dir:/project -v $flutter_dir:$flutter_dir -v $flutter_cache:$flutter_cache -e PACKAGE_PATH="/project/" docker_tests /bin/sh -c "/project/docker/docker_test.sh --update-goldens"