added fpm tests

.travis.yml

@@ -1,11 +1,13 @@
 language: go
 go: 1.8
-install: make setup
+install:
+  - make setup
+  - gem install fpm
 script:
   - make test
 after_success:
   - go get github.com/mattn/goveralls
   - goveralls -coverprofile=coverage.out -service=travis-ci -repotoken="$COVERALLS_TOKEN"
-  - test -n "$TRAVIS_TAG" && gem install fpm && go run main.go
+  - test -n "$TRAVIS_TAG" && go run main.go
 notifications:
   email: false

pipeline/fpm/fpm_test.go

@@ -0,0 +1,73 @@
+package fpm
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/goreleaser/goreleaser/config"
+	"github.com/goreleaser/goreleaser/context"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDescription(t *testing.T) {
+	assert.NotEmpty(t, Pipe{}.Description())
+}
+
+func TestRunPipeNoFormats(t *testing.T) {
+	var assert = assert.New(t)
+	var ctx = &context.Context{
+		Config: config.Project{},
+	}
+	assert.NoError(Pipe{}.Run(ctx))
+}
+
+func TestRunPipe(t *testing.T) {
+	var assert = assert.New(t)
+	folder, err := ioutil.TempDir("", "archivetest")
+	assert.NoError(err)
+	var dist = filepath.Join(folder, "dist")
+	assert.NoError(os.Mkdir(dist, 0755))
+	assert.NoError(os.Mkdir(filepath.Join(dist, "mybin"), 0755))
+	_, err = os.Create(filepath.Join(dist, "mybin", "mybin"))
+	assert.NoError(err)
+	var ctx = &context.Context{
+		Archives: map[string]string{
+			"linuxamd64": "mybin",
+		},
+		Config: config.Project{
+			Dist: dist,
+			Build: config.Build{
+				Goarch: []string{
+					"amd64",
+					"i386",
+				},
+				Binary: "mybin",
+			},
+			FPM: config.FPM{
+				Formats:      []string{"deb"},
+				Dependencies: []string{"make"},
+				Conflicts:    []string{"git"},
+			},
+		},
+	}
+	assert.NoError(Pipe{}.Run(ctx))
+}
+
+func TestNoFPMInPath(t *testing.T) {
+	var assert = assert.New(t)
+	var path = os.Getenv("PATH")
+	defer func() {
+		assert.NoError(os.Setenv("PATH", path))
+	}()
+	os.Setenv("PATH", "")
+	var ctx = &context.Context{
+		Config: config.Project{
+			FPM: config.FPM{
+				Formats: []string{"deb"},
+			},
+		},
+	}
+	assert.EqualError(Pipe{}.Run(ctx), ErrNoFPM.Error())
+}