Use vim-testbed to run Vader tests on Travis

.travis.yml

@@ -1,8 +1,7 @@
 ---
+sudo: required
+services:
+    - docker
 language: python
-python: 2.7
-cache: pip
-install:
-  - "pip install vim-vint==0.3.9"
-script:
-  - "vint -s ."
+script: |
+    make test

Dockerfile

@@ -0,0 +1,17 @@
+FROM tweekmonster/vim-testbed:latest
+
+RUN install_vim -tag v8.0.0000 -build \
+                -tag v8.0.0027 -build
+
+ENV PACKAGES="\
+    git \
+    python=2.7.12-r0 \
+    py-pip=8.1.2-r0 \
+"
+RUN apk --update add $PACKAGES && \
+    rm -rf /var/cache/apk/* /tmp/* /var/tmp/*
+
+RUN pip install vim-vint==0.3.9
+
+RUN git clone https://github.com/junegunn/vader.vim vader && \
+    cd vader && git checkout c6243dd81c98350df4dec608fa972df98fa2a3af

Makefile

@@ -0,0 +1,17 @@
+IMAGE ?= w0rp/ale
+DOCKER = docker run -a stderr --rm -v $(PWD):/testplugin -v $(PWD)/test:/home "$(IMAGE)"
+
+test-setup:
+	docker images -q $(IMAGE) || docker pull $(IMAGE)
+
+test: test-setup
+	vims=$$(docker run --rm $(IMAGE) ls /vim-build/bin | grep -E '^n?vim'); \
+	if [ -z "$$vims" ]; then echo "No Vims found!"; exit 1; fi; \
+	EXIT=0; \
+	for vim in $$vims; do \
+	  $(DOCKER) $$vim '+Vader! test/*' || EXIT=$$?; \
+	done; \
+	$(DOCKER) vint -s /testplugin || EXIT=$$?; \
+	exit $$EXIT;
+
+.PHONY: test-setup test

test/example.vader

@@ -0,0 +1,9 @@
+Given (Hello):
+  Hello
+
+Do (yyp):
+  yyp
+
+Expect (Hello\nHello):
+  Hello
+  Hello

test/vimrc

@@ -0,0 +1,21 @@
+" Load builtin plugins
+" We need this because run_vim.sh sets -i NONE
+set rtp=/home/vim,$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after,/home/vim/after
+set rtp+=/vader
+
+" The following is just an example
+filetype plugin indent on
+syntax on
+set nocompatible
+set tabstop=4
+set softtabstop=4
+set shiftwidth=4
+set expandtab
+set backspace=2
+set nofoldenable
+set foldmethod=syntax
+set foldlevelstart=10
+set foldnestmax=10
+set ttimeoutlen=0
+
+let mapleader=','