Add unit tests to build. Pin to specific Alpine tag.

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

gateway/Dockerfile

@@ -13,9 +13,12 @@ COPY queue          queue
 COPY plugin         plugin
 COPY server.go      .
 
-RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o gateway .
+# Run a gofmt and exclude all vendored code.
+RUN test -z "$(gofmt -l $(find . -type f -name '*.go' -not -path "./vendor/*"))" \
+    && go test $(go list ./... | grep -v integration | grep -v /vendor/ | grep -v /template/) -cover \
+    && CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o gateway .
 
-FROM alpine:latest
+FROM alpine:3.6
 WORKDIR /root/
 
 EXPOSE 8080

gateway/handlers/deletehandler.go

@@ -12,11 +12,11 @@ import (
 
 	"io/ioutil"
 
-	"github.com/openfaas/faas/gateway/metrics"
-	"github.com/openfaas/faas/gateway/requests"
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/filters"
 	"github.com/docker/docker/client"
+	"github.com/openfaas/faas/gateway/metrics"
+	"github.com/openfaas/faas/gateway/requests"
 )
 
 func MakeDeleteFunctionHandler(metricsOptions metrics.MetricOptions, c *client.Client) http.HandlerFunc {

gateway/handlers/queueproxy.go

@@ -10,9 +10,9 @@ import (
 	"net/url"
 
 	"github.com/Sirupsen/logrus"
+	"github.com/gorilla/mux"
 	"github.com/openfaas/faas/gateway/metrics"
 	"github.com/openfaas/faas/gateway/queue"
-	"github.com/gorilla/mux"
 )
 
 // MakeQueuedProxy accepts work onto a queue

gateway/handlers/reader.go

@@ -11,11 +11,11 @@ import (
 
 	"strings"
 
-	"github.com/openfaas/faas/gateway/metrics"
-	"github.com/openfaas/faas/gateway/requests"
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/filters"
 	"github.com/docker/docker/client"
+	"github.com/openfaas/faas/gateway/metrics"
+	"github.com/openfaas/faas/gateway/requests"
 )
 
 // MakeFunctionReader gives a summary of Function structs with Docker service stats overlaid with Prometheus counters.

gateway/tests/registryauth_test.go

@@ -9,8 +9,8 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/openfaas/faas/gateway/handlers"
 	"github.com/docker/docker/api/types"
+	"github.com/openfaas/faas/gateway/handlers"
 )
 
 func TestBuildEncodedAuthConfig(t *testing.T) {