✨ Implement Handler and HandlerFunc, add comprehensive tests

go.mod

@@ -1,3 +1,11 @@
 module codeberg.org/danjones000/ezhandler
 
 go 1.24.2
+
+require github.com/stretchr/testify v1.10.0
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -0,0 +1,10 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

handler_test.go

@@ -1 +1,48 @@
 package ezhandler_test
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"codeberg.org/danjones000/ezhandler"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestHandlerFunc_ServeHTTP(t *testing.T) {
+	tests := []struct {
+		name        string
+		handlerFunc ezhandler.HandlerFunc
+		expectedErr error
+	}{
+		{
+			name: "no error",
+			handlerFunc: ezhandler.HandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
+				w.WriteHeader(http.StatusOK)
+				return nil
+			}),
+			expectedErr: nil,
+		},
+		{
+			name: "with error",
+			handlerFunc: ezhandler.HandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
+				return errTest
+			}),
+			expectedErr: errTest,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			req := httptest.NewRequest(http.MethodGet, "/", http.NoBody)
+			rec := httptest.NewRecorder()
+
+			err := tt.handlerFunc.ServeHTTP(rec, req)
+			if tt.expectedErr != nil {
+				assert.Equal(t, tt.expectedErr, err)
+			} else {
+				assert.NoError(t, err)
+			}
+		})
+	}
+}

helper.go

@@ -18,13 +18,19 @@ type Helper struct{
 // Handler returns an [http.Handler] for the provided [Handler].
 // If hnd returns an error, an appropriate error response is written using the ErrorHandler.
 func (help *Helper) Handler(hnd Handler) http.Handler {
-	// TODO implement this
-	panic("unimplemented")
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if err := hnd.ServeHTTP(w, r); err != nil {
+			help.errHandler(w, r, err)
+		}
+	})
 }
 
 // Handler returns an [http.Handler] for the provided [HandlerFunc].
 // If hnd returns an error, an appropriate error response is written using the ErrorHandler.
 func (help *Helper) HandlerFunc(hnd HandlerFunc) http.Handler {
-	// TODO implement this
-	panic("unimplemented")
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if err := hnd(w, r); err != nil {
+			help.errHandler(w, r, err)
+		}
+	})
 }

helper_test.go

@@ -1 +1,63 @@
 package ezhandler_test
+
+import (
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"codeberg.org/danjones000/ezhandler"
+	"github.com/stretchr/testify/assert"
+)
+
+var (
+	errTest = errors.New("test error")
+)
+
+func TestNewHelper(t *testing.T) {
+	mockErrorHandler := func(w http.ResponseWriter, r *http.Request, err error) {}
+	helper := ezhandler.NewHelper(mockErrorHandler)
+	assert.NotNil(t, helper)
+}
+
+func runHelperTest(t *testing.T, name string, handlerErr, expectedErr error, expectedErrorHandlerCalled bool, handlerType string) {
+	t.Run(name, func(t *testing.T) {
+		var errorHandlerCalled bool
+		mockErrorHandler := func(w http.ResponseWriter, r *http.Request, err error) {
+			errorHandlerCalled = true
+			assert.Equal(t, expectedErr, err)
+		}
+		helper := ezhandler.NewHelper(mockErrorHandler)
+
+		req := httptest.NewRequest(http.MethodGet, "/", http.NoBody)
+		rec := httptest.NewRecorder()
+
+		var wrappedHandler http.Handler
+		switch handlerType {
+		case "Handler":
+			mockHandler := ezhandler.HandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
+				return handlerErr
+			})
+			wrappedHandler = helper.Handler(mockHandler)
+		case "HandlerFunc":
+			mockHandlerFunc := ezhandler.HandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
+				return handlerErr
+			})
+			wrappedHandler = helper.HandlerFunc(mockHandlerFunc)
+		}
+
+		wrappedHandler.ServeHTTP(rec, req)
+
+		assert.Equal(t, expectedErrorHandlerCalled, errorHandlerCalled)
+	})
+}
+
+func TestHelper_Handler(t *testing.T) {
+	runHelperTest(t, "no error", nil, nil, false, "Handler")
+	runHelperTest(t, "with error", errTest, errTest, true, "Handler")
+}
+
+func TestHelper_HandlerFunc(t *testing.T) {
+	runHelperTest(t, "no error", nil, nil, false, "HandlerFunc")
+	runHelperTest(t, "with error", errTest, errTest, true, "HandlerFunc")
+}