more repo dump/restore tests, including pull requests

The tests were refactored so that all YAML files content are checked,
unless an exception is set (for instance for the Updated field which
is automatically updated by the database and cannot be expected to be
identical over a dump/restore/dump round.

This approach helps catch more errors where fields are added in the
migration files because they do not need to be added to the tests to
be verified.

It also helps as a reminder of what is left to be implemented, such as
the the Assignees field in issues.

A helper is added to keep the tests DRY and facilitate their
maintenance.

Signed-off-by: Loïc Dachary <loic@dachary.org>

integrations/dump_restore_test.go

@@ -6,9 +6,12 @@ package integrations
 
 import (
 	"context"
+	"errors"
+	"fmt"
 	"net/url"
 	"os"
 	"path/filepath"
+	"reflect"
 	"strings"
 	"testing"
 
@@ -58,6 +61,7 @@ func TestDumpRestore(t *testing.T) {
 		opts := migrations.MigrateOptions{
 			GitServiceType: structs.GiteaService,
 			Issues:         true,
+			PullRequests:   true,
 			Labels:         true,
 			Milestones:     true,
 			Comments:       true,
@@ -80,57 +84,252 @@ func TestDumpRestore(t *testing.T) {
 		// Phase 2: restore from the filesystem to the Gitea instance in restoredrepo
 		//
 
-		newreponame := "restoredrepo"
-		err = migrations.RestoreRepository(ctx, d, repo.OwnerName, newreponame, []string{"labels", "milestones", "issues", "comments"}, false)
+		newreponame := "restored"
+		err = migrations.RestoreRepository(ctx, d, repo.OwnerName, newreponame, []string{
+			"labels", "issues", "comments", "milestones", "pull_requests",
+		}, false)
 		assert.NoError(t, err)
 
 		newrepo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{Name: newreponame}).(*repo_model.Repository)
 
 		//
-		// Phase 3: dump restoredrepo from the Gitea instance to the filesystem
+		// Phase 3: dump restored from the Gitea instance to the filesystem
 		//
 		opts.RepoName = newreponame
 		opts.CloneAddr = newrepo.CloneLink().HTTPS
 		err = migrations.DumpRepository(ctx, basePath, repoOwner.Name, opts)
 		assert.NoError(t, err)
 
 		//
-		// Verify the dump of restoredrepo is the same as the dump of repo1
+		// Verify the dump of restored is the same as the dump of repo1
 		//
-		newd := filepath.Join(basePath, newrepo.OwnerName, newrepo.Name)
-		for _, filename := range []string{"repo.yml", "label.yml", "milestone.yml"} {
-			beforeBytes, err := os.ReadFile(filepath.Join(d, filename))
-			assert.NoError(t, err)
-			before := strings.ReplaceAll(string(beforeBytes), reponame, newreponame)
-			after, err := os.ReadFile(filepath.Join(newd, filename))
-			assert.NoError(t, err)
-			assert.EqualValues(t, before, string(after))
+		comparator := &compareDump{
+			t:        t,
+			basePath: basePath,
 		}
+		comparator.assertEquals(repo, newrepo)
+	})
+}
 
-		beforeBytes, err := os.ReadFile(filepath.Join(d, "issue.yml"))
-		assert.NoError(t, err)
-		before := make([]*base.Issue, 0, 10)
-		assert.NoError(t, yaml.Unmarshal(beforeBytes, &before))
-		afterBytes, err := os.ReadFile(filepath.Join(newd, "issue.yml"))
-		assert.NoError(t, err)
-		after := make([]*base.Issue, 0, 10)
-		assert.NoError(t, yaml.Unmarshal(afterBytes, &after))
-
-		assert.EqualValues(t, len(before), len(after))
-		if len(before) == len(after) {
-			for i := 0; i < len(before); i++ {
-				assert.EqualValues(t, before[i].Number, after[i].Number)
-				assert.EqualValues(t, before[i].Title, after[i].Title)
-				assert.EqualValues(t, before[i].Content, after[i].Content)
-				assert.EqualValues(t, before[i].Ref, after[i].Ref)
-				assert.EqualValues(t, before[i].Milestone, after[i].Milestone)
-				assert.EqualValues(t, before[i].State, after[i].State)
-				assert.EqualValues(t, before[i].IsLocked, after[i].IsLocked)
-				assert.EqualValues(t, before[i].Created, after[i].Created)
-				assert.EqualValues(t, before[i].Updated, after[i].Updated)
-				assert.EqualValues(t, before[i].Labels, after[i].Labels)
-				assert.EqualValues(t, before[i].Reactions, after[i].Reactions)
+type compareDump struct {
+	t          *testing.T
+	basePath   string
+	repoBefore *repo_model.Repository
+	dirBefore  string
+	repoAfter  *repo_model.Repository
+	dirAfter   string
+}
+
+type compareField struct {
+	before    interface{}
+	after     interface{}
+	ignore    bool
+	transform func(string) string
+	nested    *compareFields
+}
+
+type compareFields map[string]compareField
+
+func (c *compareDump) replaceRepoName(original string) string {
+	return strings.ReplaceAll(original, c.repoBefore.Name, c.repoAfter.Name)
+}
+
+func (c *compareDump) assertEquals(repoBefore, repoAfter *repo_model.Repository) {
+	c.repoBefore = repoBefore
+	c.dirBefore = filepath.Join(c.basePath, repoBefore.OwnerName, repoBefore.Name)
+	c.repoAfter = repoAfter
+	c.dirAfter = filepath.Join(c.basePath, repoAfter.OwnerName, repoAfter.Name)
+
+	for _, filename := range []string{"repo.yml", "label.yml"} {
+		beforeBytes, err := os.ReadFile(filepath.Join(c.dirBefore, filename))
+		assert.NoError(c.t, err)
+		before := c.replaceRepoName(string(beforeBytes))
+		after, err := os.ReadFile(filepath.Join(c.dirAfter, filename))
+		assert.NoError(c.t, err)
+		assert.EqualValues(c.t, before, string(after))
+	}
+
+	//
+	// base.Repository
+	//
+	_ = c.assertEqual("repo.yml", base.Repository{}, compareFields{
+		"Name": {
+			before: c.repoBefore.Name,
+			after:  c.repoAfter.Name,
+		},
+		"CloneURL":    {transform: c.replaceRepoName},
+		"OriginalURL": {transform: c.replaceRepoName},
+	})
+
+	//
+	// base.Label
+	//
+	labels, ok := c.assertEqual("label.yml", []base.Label{}, compareFields{}).([]*base.Label)
+	assert.True(c.t, ok)
+	assert.GreaterOrEqual(c.t, len(labels), 1)
+
+	//
+	// base.Milestone
+	//
+	milestones, ok := c.assertEqual("milestone.yml", []base.Milestone{}, compareFields{
+		"Updated": {ignore: true}, // the database updates that field independently
+	}).([]*base.Milestone)
+	assert.True(c.t, ok)
+	assert.GreaterOrEqual(c.t, len(milestones), 1)
+
+	//
+	// base.Issue and the associated comments
+	//
+	issues, ok := c.assertEqual("issue.yml", []base.Issue{}, compareFields{
+		"Assignees": {ignore: true}, // not implemented yet
+	}).([]*base.Issue)
+	assert.True(c.t, ok)
+	assert.GreaterOrEqual(c.t, len(issues), 1)
+	for _, issue := range issues {
+		filename := filepath.Join("comments", fmt.Sprintf("%d.yml", issue.Number))
+		comments, ok := c.assertEqual(filename, []base.Comment{}, compareFields{}).([]*base.Comment)
+		assert.True(c.t, ok)
+		for _, comment := range comments {
+			assert.EqualValues(c.t, issue.Number, comment.IssueIndex)
+		}
+	}
+
+	//
+	// base.PullRequest and the associated comments
+	//
+	comparePullRequestBranch := &compareFields{
+		"RepoName": {
+			before: c.repoBefore.Name,
+			after:  c.repoAfter.Name,
+		},
+		"CloneURL": {transform: c.replaceRepoName},
+	}
+	prs, ok := c.assertEqual("pull_request.yml", []base.PullRequest{}, compareFields{
+		"Assignees": {ignore: true}, // not implemented yet
+		"Head":      {nested: comparePullRequestBranch},
+		"Base":      {nested: comparePullRequestBranch},
+		"Labels":    {ignore: true}, // because org labels are not handled propery
+	}).([]*base.PullRequest)
+	assert.True(c.t, ok)
+	assert.GreaterOrEqual(c.t, len(prs), 1)
+	for _, pr := range prs {
+		filename := filepath.Join("comments", fmt.Sprintf("%d.yml", pr.Number))
+		comments, ok := c.assertEqual(filename, []base.Comment{}, compareFields{}).([]*base.Comment)
+		assert.True(c.t, ok)
+		for _, comment := range comments {
+			assert.EqualValues(c.t, pr.Number, comment.IssueIndex)
+		}
+	}
+}
+
+func (c *compareDump) assertLoadYAMLFiles(beforeFilename, afterFilename string, before, after interface{}) {
+	_, beforeErr := os.Stat(beforeFilename)
+	_, afterErr := os.Stat(afterFilename)
+	assert.EqualValues(c.t, errors.Is(beforeErr, os.ErrNotExist), errors.Is(afterErr, os.ErrNotExist))
+	if errors.Is(beforeErr, os.ErrNotExist) {
+		return
+	}
+
+	beforeBytes, err := os.ReadFile(beforeFilename)
+	assert.NoError(c.t, err)
+	assert.NoError(c.t, yaml.Unmarshal(beforeBytes, before))
+	afterBytes, err := os.ReadFile(afterFilename)
+	assert.NoError(c.t, err)
+	assert.NoError(c.t, yaml.Unmarshal(afterBytes, after))
+}
+
+func (c *compareDump) assertLoadFiles(beforeFilename, afterFilename string, t reflect.Type) (before, after reflect.Value) {
+	var beforePtr, afterPtr reflect.Value
+	if t.Kind() == reflect.Slice {
+		//
+		// Given []Something{} create afterPtr, beforePtr []*Something{}
+		//
+		sliceType := reflect.SliceOf(reflect.PtrTo(t.Elem()))
+		beforeSlice := reflect.MakeSlice(sliceType, 0, 10)
+		beforePtr = reflect.New(beforeSlice.Type())
+		beforePtr.Elem().Set(beforeSlice)
+		afterSlice := reflect.MakeSlice(sliceType, 0, 10)
+		afterPtr = reflect.New(afterSlice.Type())
+		afterPtr.Elem().Set(afterSlice)
+	} else {
+		//
+		// Given Something{} create afterPtr, beforePtr *Something{}
+		//
+		beforePtr = reflect.New(t)
+		afterPtr = reflect.New(t)
+	}
+	c.assertLoadYAMLFiles(beforeFilename, afterFilename, beforePtr.Interface(), afterPtr.Interface())
+	return beforePtr.Elem(), afterPtr.Elem()
+}
+
+func (c *compareDump) assertEqual(filename string, kind interface{}, fields compareFields) (i interface{}) {
+	beforeFilename := filepath.Join(c.dirBefore, filename)
+	afterFilename := filepath.Join(c.dirAfter, filename)
+
+	typeOf := reflect.TypeOf(kind)
+	before, after := c.assertLoadFiles(beforeFilename, afterFilename, typeOf)
+	if typeOf.Kind() == reflect.Slice {
+		i = c.assertEqualSlices(before, after, fields)
+	} else {
+		i = c.assertEqualValues(before, after, fields)
+	}
+	return i
+}
+
+func (c *compareDump) assertEqualSlices(before, after reflect.Value, fields compareFields) interface{} {
+	assert.EqualValues(c.t, before.Len(), after.Len())
+	if before.Len() == after.Len() {
+		for i := 0; i < before.Len(); i++ {
+			_ = c.assertEqualValues(
+				reflect.Indirect(before.Index(i).Elem()),
+				reflect.Indirect(after.Index(i).Elem()),
+				fields)
+		}
+	}
+	return after.Interface()
+}
+
+func (c *compareDump) assertEqualValues(before, after reflect.Value, fields compareFields) interface{} {
+	for _, field := range reflect.VisibleFields(before.Type()) {
+		bf := before.FieldByName(field.Name)
+		bi := bf.Interface()
+		af := after.FieldByName(field.Name)
+		ai := af.Interface()
+		if compare, ok := fields[field.Name]; ok {
+			if compare.ignore == true {
+				//
+				// Ignore
+				//
+				continue
+			}
+			if compare.transform != nil {
+				//
+				// Transform these strings before comparing them
+				//
+				bs, ok := bi.(string)
+				assert.True(c.t, ok)
+				as, ok := ai.(string)
+				assert.True(c.t, ok)
+				assert.EqualValues(c.t, compare.transform(bs), compare.transform(as))
+				continue
+			}
+			if compare.before != nil && compare.after != nil {
+				//
+				// The fields are expected to have different values
+				//
+				assert.EqualValues(c.t, compare.before, bi)
+				assert.EqualValues(c.t, compare.after, ai)
+				continue
+			}
+			if compare.nested != nil {
+				//
+				// The fields are a struct, recurse
+				//
+				c.assertEqualValues(bf, af, *compare.nested)
+				continue
 			}
 		}
-	})
+		assert.EqualValues(c.t, bi, ai)
+	}
+	return after.Interface()
 }