[bugfix] Rework MultiError to wrap + unwrap errors properly (#2057)

* rework multierror a bit

* test multierror

internal/api/activitypub/users/inboxpost_test.go

@@ -22,7 +22,6 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
-	"fmt"
 	"io"
 	"net/http"
 	"net/http/httptest"
@@ -105,16 +104,16 @@ func (suite *InboxPostTestSuite) inboxPost(
 		suite.FailNow(err.Error())
 	}
 
-	errs := gtserror.MultiError{}
+	errs := gtserror.NewMultiError(2)
 
 	// Check expected code + body.
 	if resultCode := recorder.Code; expectedHTTPStatus != resultCode {
-		errs = append(errs, fmt.Sprintf("expected %d got %d", expectedHTTPStatus, resultCode))
+		errs.Appendf("expected %d got %d", expectedHTTPStatus, resultCode)
 	}
 
 	// If we got an expected body, return early.
 	if expectedBody != "" && string(b) != expectedBody {
-		errs = append(errs, fmt.Sprintf("expected %s got %s", expectedBody, string(b)))
+		errs.Appendf("expected %s got %s", expectedBody, string(b))
 	}
 
 	if err := errs.Combine(); err != nil {

internal/api/client/accounts/accountupdate_test.go

@@ -90,16 +90,16 @@ func (suite *AccountUpdateTestSuite) updateAccount(
 		return nil, err
 	}
 
-	errs := gtserror.MultiError{}
+	errs := gtserror.NewMultiError(2)
 
 	// Check expected code + body.
 	if resultCode := recorder.Code; expectedHTTPStatus != resultCode {
-		errs = append(errs, fmt.Sprintf("expected %d got %d", expectedHTTPStatus, resultCode))
+		errs.Appendf("expected %d got %d", expectedHTTPStatus, resultCode)
 	}
 
 	// If we got an expected body, return early.
 	if expectedBody != "" && string(b) != expectedBody {
-		errs = append(errs, fmt.Sprintf("expected %s got %s", expectedBody, string(b)))
+		errs.Appendf("expected %s got %s", expectedBody, string(b))
 	}
 
 	if err := errs.Combine(); err != nil {

internal/api/client/accounts/lists_test.go

@@ -19,7 +19,6 @@ package accounts_test
 
 import (
 	"encoding/json"
-	"fmt"
 	"io"
 	"net/http"
 	"net/http/httptest"
@@ -63,16 +62,16 @@ func (suite *ListsTestSuite) getLists(targetAccountID string, expectedHTTPStatus
 		suite.FailNow(err.Error())
 	}
 
-	errs := gtserror.MultiError{}
+	errs := gtserror.NewMultiError(2)
 
 	// Check expected code + body.
 	if resultCode := recorder.Code; expectedHTTPStatus != resultCode {
-		errs = append(errs, fmt.Sprintf("expected %d got %d", expectedHTTPStatus, resultCode))
+		errs.Appendf("expected %d got %d", expectedHTTPStatus, resultCode)
 	}
 
 	// If we got an expected body, return early.
 	if expectedBody != "" && string(b) != expectedBody {
-		errs = append(errs, fmt.Sprintf("expected %s got %s", expectedBody, string(b)))
+		errs.Appendf("expected %s got %s", expectedBody, string(b))
 	}
 
 	if err := errs.Combine(); err != nil {

internal/api/client/accounts/search_test.go

@@ -19,7 +19,6 @@ package accounts_test
 
 import (
 	"encoding/json"
-	"fmt"
 	"io"
 	"net/http"
 	"net/http/httptest"
@@ -99,16 +98,16 @@ func (suite *AccountSearchTestSuite) getSearch(
 		suite.FailNow(err.Error())
 	}
 
-	errs := gtserror.MultiError{}
+	errs := gtserror.NewMultiError(2)
 
 	// Check expected code + body.
 	if resultCode := recorder.Code; expectedHTTPStatus != resultCode {
-		errs = append(errs, fmt.Sprintf("expected %d got %d", expectedHTTPStatus, resultCode))
+		errs.Appendf("expected %d got %d", expectedHTTPStatus, resultCode)
 	}
 
 	// If we got an expected body, return early.
 	if expectedBody != "" && string(b) != expectedBody {
-		errs = append(errs, fmt.Sprintf("expected %s got %s", expectedBody, string(b)))
+		errs.Appendf("expected %s got %s", expectedBody, string(b))
 	}
 
 	if err := errs.Combine(); err != nil {

internal/api/client/admin/reportresolve_test.go

@@ -19,7 +19,6 @@ package admin_test
 
 import (
 	"encoding/json"
-	"fmt"
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
@@ -84,16 +83,16 @@ func (suite *ReportResolveTestSuite) resolveReport(
 		return nil, err
 	}
 
-	errs := gtserror.MultiError{}
+	errs := gtserror.NewMultiError(2)
 
 	if resultCode := recorder.Code; expectedHTTPStatus != resultCode {
-		errs = append(errs, fmt.Sprintf("expected %d got %d", expectedHTTPStatus, resultCode))
+		errs.Appendf("expected %d got %d", expectedHTTPStatus, resultCode)
 	}
 
 	// if we got an expected body, return early
 	if expectedBody != "" {
 		if string(b) != expectedBody {
-			errs = append(errs, fmt.Sprintf("expected %s got %s", expectedBody, string(b)))
+			errs.Appendf("expected %s got %s", expectedBody, string(b))
 		}
 		return nil, errs.Combine()
 	}

internal/api/client/admin/reportsget_test.go

@@ -19,7 +19,6 @@ package admin_test
 
 import (
 	"encoding/json"
-	"fmt"
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
@@ -101,16 +100,16 @@ func (suite *ReportsGetTestSuite) getReports(
 		return nil, "", err
 	}
 
-	errs := gtserror.MultiError{}
+	errs := gtserror.NewMultiError(2)
 
 	if resultCode := recorder.Code; expectedHTTPStatus != resultCode {
-		errs = append(errs, fmt.Sprintf("expected %d got %d", expectedHTTPStatus, resultCode))
+		errs.Appendf("expected %d got %d", expectedHTTPStatus, resultCode)
 	}
 
 	// if we got an expected body, return early
 	if expectedBody != "" {
 		if string(b) != expectedBody {
-			errs = append(errs, fmt.Sprintf("expected %s got %s", expectedBody, string(b)))
+			errs.Appendf("expected %s got %s", expectedBody, string(b))
 		}
 		return nil, "", errs.Combine()
 	}

internal/api/client/lists/listaccounts_test.go

@@ -19,7 +19,6 @@ package lists_test
 
 import (
 	"encoding/json"
-	"fmt"
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
@@ -103,17 +102,17 @@ func (suite *ListAccountsTestSuite) getListAccounts(
 		return nil, "", err
 	}
 
-	errs := gtserror.MultiError{}
+	errs := gtserror.NewMultiError(2)
 
 	// check code + body
 	if resultCode := recorder.Code; expectedHTTPStatus != resultCode {
-		errs = append(errs, fmt.Sprintf("expected %d got %d", expectedHTTPStatus, resultCode))
+		errs.Appendf("expected %d got %d", expectedHTTPStatus, resultCode)
 	}
 
 	// if we got an expected body, return early
 	if expectedBody != "" {
 		if string(b) != expectedBody {
-			errs = append(errs, fmt.Sprintf("expected %s got %s", expectedBody, string(b)))
+			errs.Appendf("expected %s got %s", expectedBody, string(b))
 		}
 		return nil, "", errs.Combine()
 	}

internal/api/client/reports/reportcreate_test.go

@@ -19,7 +19,6 @@ package reports_test
 
 import (
 	"encoding/json"
-	"fmt"
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
@@ -77,17 +76,17 @@ func (suite *ReportCreateTestSuite) createReport(expectedHTTPStatus int, expecte
 		return nil, err
 	}
 
-	errs := gtserror.MultiError{}
+	errs := gtserror.NewMultiError(2)
 
 	// check code + body
 	if resultCode := recorder.Code; expectedHTTPStatus != resultCode {
-		errs = append(errs, fmt.Sprintf("expected %d got %d", expectedHTTPStatus, resultCode))
+		errs.Appendf("expected %d got %d", expectedHTTPStatus, resultCode)
 	}
 
 	// if we got an expected body, return early
 	if expectedBody != "" {
 		if string(b) != expectedBody {
-			errs = append(errs, fmt.Sprintf("expected %s got %s", expectedBody, string(b)))
+			errs.Appendf("expected %s got %s", expectedBody, string(b))
 		}
 		return nil, errs.Combine()
 	}

internal/api/client/reports/reportget_test.go

@@ -19,7 +19,6 @@ package reports_test
 
 import (
 	"encoding/json"
-	"fmt"
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
@@ -64,17 +63,17 @@ func (suite *ReportGetTestSuite) getReport(expectedHTTPStatus int, expectedBody
 		return nil, err
 	}
 
-	errs := gtserror.MultiError{}
+	errs := gtserror.NewMultiError(2)
 
 	// check code + body
 	if resultCode := recorder.Code; expectedHTTPStatus != resultCode {
-		errs = append(errs, fmt.Sprintf("expected %d got %d", expectedHTTPStatus, resultCode))
+		errs.Appendf("expected %d got %d", expectedHTTPStatus, resultCode)
 	}
 
 	// if we got an expected body, return early
 	if expectedBody != "" {
 		if string(b) != expectedBody {
-			errs = append(errs, fmt.Sprintf("expected %s got %s", expectedBody, string(b)))
+			errs.Appendf("expected %s got %s", expectedBody, string(b))
 		}
 		return nil, errs.Combine()
 	}

internal/api/client/search/searchget_test.go

@@ -22,7 +22,6 @@ import (
 	"crypto/rand"
 	"crypto/rsa"
 	"encoding/json"
-	"fmt"
 	"io"
 	"net/http"
 	"net/http/httptest"
@@ -122,16 +121,16 @@ func (suite *SearchGetTestSuite) getSearch(
 		suite.FailNow(err.Error())
 	}
 
-	errs := gtserror.MultiError{}
+	errs := gtserror.NewMultiError(2)
 
 	// Check expected code + body.
 	if resultCode := recorder.Code; expectedHTTPStatus != resultCode {
-		errs = append(errs, fmt.Sprintf("expected %d got %d: %v", expectedHTTPStatus, resultCode, ctx.Errors.JSON()))
+		errs.Appendf("expected %d got %d", expectedHTTPStatus, resultCode)
 	}
 
 	// If we got an expected body, return early.
 	if expectedBody != "" && string(b) != expectedBody {
-		errs = append(errs, fmt.Sprintf("expected %s got %s", expectedBody, string(b)))
+		errs.Appendf("expected %s got %s", expectedBody, string(b))
 	}
 
 	if err := errs.Combine(); err != nil {

internal/api/client/statuses/statuspin_test.go

@@ -20,7 +20,6 @@ package statuses_test
 import (
 	"context"
 	"encoding/json"
-	"fmt"
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
@@ -74,20 +73,20 @@ func (suite *StatusPinTestSuite) createPin(
 		return nil, err
 	}
 
-	errs := gtserror.MultiError{}
+	errs := gtserror.NewMultiError(2)
 
-	// check code + body
+	// Check expected code + body.
 	if resultCode := recorder.Code; expectedHTTPStatus != resultCode {
-		errs = append(errs, fmt.Sprintf("expected %d got %d", expectedHTTPStatus, resultCode))
+		errs.Appendf("expected %d got %d", expectedHTTPStatus, resultCode)
 	}
 
-	// if we got an expected body, return early
+	// If we got an expected body, return early.
 	if expectedBody != "" && string(b) != expectedBody {
-		errs = append(errs, fmt.Sprintf("expected %s got %s", expectedBody, string(b)))
+		errs.Appendf("expected %s got %s", expectedBody, string(b))
 	}
 
-	if len(errs) > 0 {
-		return nil, errs.Combine()
+	if err := errs.Combine(); err != nil {
+		suite.FailNow("", "%v (body %s)", err, string(b))
 	}
 
 	resp := &apimodel.Status{}

internal/api/client/statuses/statusunpin_test.go

@@ -19,7 +19,6 @@ package statuses_test
 
 import (
 	"encoding/json"
-	"fmt"
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
@@ -68,20 +67,20 @@ func (suite *StatusUnpinTestSuite) createUnpin(
 		return nil, err
 	}
 
-	errs := gtserror.MultiError{}
+	errs := gtserror.NewMultiError(2)
 
-	// check code + body
+	// Check expected code + body.
 	if resultCode := recorder.Code; expectedHTTPStatus != resultCode {
-		errs = append(errs, fmt.Sprintf("expected %d got %d", expectedHTTPStatus, resultCode))
+		errs.Appendf("expected %d got %d", expectedHTTPStatus, resultCode)
 	}
 
-	// if we got an expected body, return early
+	// If we got an expected body, return early.
 	if expectedBody != "" && string(b) != expectedBody {
-		errs = append(errs, fmt.Sprintf("expected %s got %s", expectedBody, string(b)))
+		errs.Appendf("expected %s got %s", expectedBody, string(b))
 	}
 
-	if len(errs) > 0 {
-		return nil, errs.Combine()
+	if err := errs.Combine(); err != nil {
+		suite.FailNow("", "%v (body %s)", err, string(b))
 	}
 
 	resp := &apimodel.Status{}