Use Docker Compose on Travis CI and local dev.

.gitignore

@@ -1 +1,3 @@
 mongodb_exporter
+coverage.txt
+coverage_temp.txt

.travis.yml

@@ -1,10 +1,25 @@
-sudo: false
+dist: trusty
+sudo: required
 language: go
 
 go:
-  - 1.7.x
   - 1.8.x
   - tip
 
+env:
+  - MONGODB_IMAGE=mongo:3.4
+  - MONGODB_IMAGE=percona/percona-server-mongodb:3.4
+
+services:
+  - docker
+
+before_script:
+  - docker --version
+  - docker-compose --version
+  - docker-compose up -d
+
 script:
-  - make
+  - make format build testall
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)

CONTRIBUTING.md

@@ -0,0 +1,20 @@
+# Contributing notes
+
+## Local setup
+
+The easiest way to make a local development setup is to use Docker Compose.
+
+```
+docker-compose up
+make all testall
+export MONGODB_URL='mongodb://localhost:27017'
+./mongodb_exporter
+```
+
+`testall` make target will run integration tests.
+
+
+## Vendoring
+
+We use [Glide](https://glide.sh) to vendor dependencies. Please use released version of Glide (i.e. do not `go get`
+from `master` branch). Also please use `--strip-vendor` flag.

Makefile

@@ -1,3 +1,17 @@
+# Copyright 2015 The Prometheus Authors
+# Copyright 2017 Percona LLC
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 GO           := go
 FIRST_GOPATH := $(firstword $(subst :, ,$(shell $(GO) env GOPATH)))
 PROMU        := $(FIRST_GOPATH)/bin/promu -v
@@ -17,7 +31,21 @@ style:
 
 test:
 	@echo ">> running tests"
-	@$(GO) test -short -race $(pkgs)
+	rm -f coverage.txt
+	for p in $(pkgs); do \
+		rm -f coverage_temp.txt ; \
+		$(GO) test -v -short -race -covermode atomic -coverprofile coverage_temp.txt $$p ; \
+		cat coverage_temp.txt >> coverage.txt ; \
+	done
+
+testall:
+	@echo ">> running all tests"
+	rm -f coverage.txt
+	for p in $(pkgs); do \
+		rm -f coverage_temp.txt ; \
+		$(GO) test -v -race -covermode atomic -coverprofile coverage_temp.txt $$p ; \
+		cat coverage_temp.txt >> coverage.txt ; \
+	done
 
 format:
 	@echo ">> formatting code"

docker-compose.yml

@@ -0,0 +1,8 @@
+# see CONTRIBUTING.md
+---
+version: '3'
+services:
+  mongo:
+    image: ${MONGODB_IMAGE:-mongo:3.4}
+    ports:
+      - 127.0.0.1:27017:27017