fix: more fixes to merging

handler.go

@@ -49,7 +49,8 @@ func handleError(writer http.ResponseWriter, request *http.Request, err error, p
 
 	if parent != nil {
 		builder := NewProblem(err, http.StatusInternalServerError).
-			Respond(request)
+			Respond(request).
+			Status(0)
 
 		parent.
 			Merge(builder).

testing_test.go

@@ -1,6 +1,7 @@
 package akumu_test
 
 import (
+	"errors"
 	"net/http"
 	"testing"
 
@@ -11,6 +12,18 @@ func handler(request *http.Request) error {
 	return akumu.Response(http.StatusOK)
 }
 
+func handler2(request *http.Request) error {
+	return akumu.Failed(errors.New("failure"))
+}
+
+func handler3(request *http.Request) error {
+	return akumu.Response(http.StatusNotImplemented).Failed(errors.New("failure"))
+}
+
+func handler4(request *http.Request) error {
+	return errors.New("failure")
+}
+
 func TestHandler(t *testing.T) {
 	request, err := http.NewRequest("GET", "/", nil)
 
@@ -21,7 +34,11 @@ func TestHandler(t *testing.T) {
 	response := akumu.Record(handler, request)
 
 	if response.Code != http.StatusOK {
-		t.Fatalf("unexpected status code: %d", response.Code)
+		t.Fatalf(
+			"unexpected status code: expected %d, got %d",
+			http.StatusOK,
+			response.Code,
+		)
 	}
 }
 
@@ -32,10 +49,14 @@ func TestHTTPHandler(t *testing.T) {
 		t.Fatalf("unable to create request: %s", err)
 	}
 
-	response := akumu.Record(handler, request)
+	response := akumu.RecordHandler(akumu.Handler(handler), request)
 
 	if response.Code != http.StatusOK {
-		t.Fatalf("unexpected status code: %d", response.Code)
+		t.Fatalf(
+			"unexpected status code: expected %d, got %d",
+			http.StatusOK,
+			response.Code,
+		)
 	}
 }
 
@@ -50,6 +71,64 @@ func TestHTTPServer(t *testing.T) {
 	response := akumu.RecordServer(server, request)
 
 	if response.Code != http.StatusOK {
-		t.Fatalf("unexpected status code: %d", response.Code)
+		t.Fatalf(
+			"unexpected status code: expected %d, got %d",
+			http.StatusOK,
+			response.Code,
+		)
+	}
+}
+
+func TestHandler2(t *testing.T) {
+	request, err := http.NewRequest("GET", "/", nil)
+
+	if err != nil {
+		t.Fatalf("unable to create request: %s", err)
+	}
+
+	response := akumu.Record(handler2, request)
+
+	if response.Code != http.StatusInternalServerError {
+		t.Fatalf(
+			"unexpected status code: expected %d, got %d",
+			http.StatusInternalServerError,
+			response.Code,
+		)
+	}
+}
+
+func TestHandler3(t *testing.T) {
+	request, err := http.NewRequest("GET", "/", nil)
+
+	if err != nil {
+		t.Fatalf("unable to create request: %s", err)
+	}
+
+	response := akumu.Record(handler3, request)
+
+	if response.Code != http.StatusNotImplemented {
+		t.Fatalf(
+			"unexpected status code: expected %d, got %d",
+			http.StatusNotImplemented,
+			response.Code,
+		)
+	}
+}
+
+func TestHandler4(t *testing.T) {
+	request, err := http.NewRequest("GET", "/", nil)
+
+	if err != nil {
+		t.Fatalf("unable to create request: %s", err)
+	}
+
+	response := akumu.Record(handler4, request)
+
+	if response.Code != http.StatusInternalServerError {
+		t.Fatalf(
+			"unexpected status code: expected %d, got %d",
+			http.StatusInternalServerError,
+			response.Code,
+		)
 	}
 }