Add Dockerfile and test script for tests

tests/Dockerfile

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+FROM alpine:edge
+RUN apk add --no-cache cargo rust pkgconfig openssl-dev
+RUN mkdir /tun2proxy
+ADD src /tun2proxy/src
+ADD Cargo.toml /tun2proxy/Cargo.toml
+ADD tests /tun2proxy/tests
+WORKDIR /tun2proxy
+RUN cargo build --tests
+ENTRYPOINT ["cargo", "test"]

tests/run-tests.sh

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+#!/bin/bash
+#
+# Run as follows:
+# sudo SOCKS5_SERVER=<ip>:<port> HTTP_SERVER=<ip>:<port> ./run-tests.sh
+#
+# Alternatively, `cargo test` can be used instead of `./run-tests.sh`.
+# Note that the tests require root privileges and will change
+# the system's default routes.
+
+SCRIPT_DIR="$(dirname "$0")"
+cd "$SCRIPT_DIR/.."
+docker build -t tun2proxy-tests -f tests/Dockerfile . && docker run -e SOCKS5_SERVER -e HTTP_SERVER --rm -it tun2proxy-tests