Add travis

.gitignore

@@ -10,3 +10,9 @@
 
 # Output of the go coverage tool, specifically when used with LiteIDE
 *.out
+
+# OS files
+.DS_Store
+
+# Vendor files
+/vendor/

.travis.yml

@@ -0,0 +1,23 @@
+language: go
+
+go:
+  #- 1.0
+  #- 1.1
+  #- 1.2
+  #- 1.3
+  - 1.4
+  - 1.5
+  - 1.6
+  - 1.7
+  - 1.8
+  - 1.9
+  - 1.10
+  - tip
+
+before_install:
+  - go get github.com/axw/gocov/gocov
+  - go get github.com/mattn/goveralls
+  - go get golang.org/x/tools/cmd/cover
+
+script:
+    - $HOME/gopath/bin/goveralls

h.go

@@ -14,6 +14,13 @@ type F func(http.ResponseWriter, *http.Request) (int, error)
 // F.ServeHTTP.
 var ServeHTTP = func(w http.ResponseWriter, r *http.Request, status int,
 	err error) {
+	if status >= 400 {
+		if err != nil {
+			http.Error(w, err.Error(), status)
+		} else {
+			http.Error(w, "", status)
+		}
+	}
 }
 
 // ServeHTTP calls f(w, r) and passes the result to h.ServeHTTP.

h_test.go

@@ -0,0 +1,33 @@
+package h_test
+
+import (
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/josephspurrier/h"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestServeHTTPResponseOK(t *testing.T) {
+	r := httptest.NewRequest("GET", "/", nil)
+	w := httptest.NewRecorder()
+	h.ServeHTTP(w, r, http.StatusOK, nil)
+	assert.Equal(t, http.StatusOK, w.Code)
+}
+
+func TestServeHTTPResponseIgnoreLessThan200(t *testing.T) {
+	r := httptest.NewRequest("GET", "/", nil)
+	w := httptest.NewRecorder()
+	h.ServeHTTP(w, r, http.StatusCreated, nil)
+	assert.Equal(t, http.StatusOK, w.Code)
+}
+
+func TestServeHTTPResponseError(t *testing.T) {
+	r := httptest.NewRequest("GET", "/", nil)
+	w := httptest.NewRecorder()
+	h.ServeHTTP(w, r, http.StatusInternalServerError, errors.New("error happened"))
+	assert.Equal(t, http.StatusInternalServerError, w.Code)
+	assert.Contains(t, w.Body.String(), "error happened")
+}