Pull request 2361: imp-test-file-names

Merge in DNS/adguard-home from imp-test-file-names to master

Squashed commit of the following:

commit a0827efdf633fba012c5eb0e0f69eaabf7629724
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Mon Mar 10 21:41:46 2025 +0300

    all: imp tests

commit 21fc274d9276ce0442572261ea39a1c018490870
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Mon Mar 10 19:40:40 2025 +0300

    all: imp test file names

internal/home/middlewares_internal_test.go

@@ -0,0 +1,68 @@
+package home
+
+import (
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/AdguardTeam/golibs/ioutil"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestLimitRequestBody(t *testing.T) {
+	errReqLimitReached := &ioutil.LimitError{
+		Limit: defaultReqBodySzLim.Bytes(),
+	}
+
+	testCases := []struct {
+		wantErr error
+		name    string
+		body    string
+		want    []byte
+	}{{
+		wantErr: nil,
+		name:    "not_so_big",
+		body:    "somestr",
+		want:    []byte("somestr"),
+	}, {
+		wantErr: errReqLimitReached,
+		name:    "so_big",
+		body:    string(make([]byte, defaultReqBodySzLim+1)),
+		want:    make([]byte, defaultReqBodySzLim),
+	}, {
+		wantErr: nil,
+		name:    "empty",
+		body:    "",
+		want:    []byte(nil),
+	}}
+
+	makeHandler := func(t *testing.T, err *error) http.HandlerFunc {
+		t.Helper()
+
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			var b []byte
+			b, *err = io.ReadAll(r.Body)
+			_, werr := w.Write(b)
+			require.NoError(t, werr)
+		})
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			var err error
+			handler := makeHandler(t, &err)
+			lim := limitRequestBody(handler)
+
+			req := httptest.NewRequest(http.MethodPost, "https://www.example.com", strings.NewReader(tc.body))
+			res := httptest.NewRecorder()
+
+			lim.ServeHTTP(res, req)
+
+			assert.Equal(t, tc.wantErr, err)
+			assert.Equal(t, tc.want, res.Body.Bytes())
+		})
+	}
+}