Test renderReadmeFile (#23185)

Add test coverage to the important features of
[`routers.web.repo.renderReadmeFile`](https://github.com/go-gitea/gitea/blob/067b0c2664d127c552ccdfd264257caca4907a77/routers/web/repo/view.go#L273);
namely that:

- it can handle looking in docs/, .gitea/, and .github/
- it can handle choosing between multiple competing READMEs
- it prefers the localized README to the markdown README to the
plaintext README
- it can handle broken symlinks when processing all the options
- it uses the name of the symlink, not the name of the target of the
symlink

5 files changed, 23 insertions, 4 deletions

diff --git a/models/db/iterate_test.go b/models/db/iterate_test.go
index a713fe0d8..6bcf740c2 100644
--- a/models/db/iterate_test.go
+++ b/models/db/iterate_test.go
@@ -25,7 +25,7 @@ func TestIterate(t *testing.T) {
 		return nil
 	})
 	assert.NoError(t, err)
-	assert.EqualValues(t, 83, repoCnt)
+	assert.EqualValues(t, 84, repoCnt)
 
 	err = db.Iterate(db.DefaultContext, nil, func(ctx context.Context, repoUnit *repo_model.RepoUnit) error {
 		reopUnit2 := repo_model.RepoUnit{ID: repoUnit.ID}
diff --git a/models/db/list_test.go b/models/db/list_test.go
index ffef1e494..1295692ce 100644
--- a/models/db/list_test.go
+++ b/models/db/list_test.go
@@ -35,11 +35,11 @@ func TestFind(t *testing.T) {
 	var repoUnits []repo_model.RepoUnit
 	err := db.Find(db.DefaultContext, &opts, &repoUnits)
 	assert.NoError(t, err)
-	assert.EqualValues(t, 83, len(repoUnits))
+	assert.EqualValues(t, 84, len(repoUnits))
 
 	cnt, err := db.Count(db.DefaultContext, &opts, new(repo_model.RepoUnit))
 	assert.NoError(t, err)
-	assert.EqualValues(t, 83, cnt)
+	assert.EqualValues(t, 84, cnt)
 
 	repoUnits = make([]repo_model.RepoUnit, 0, 10)
 	newCnt, err := db.FindAndCount(db.DefaultContext, &opts, &repoUnits)
diff --git a/models/fixtures/repo_unit.yml b/models/fixtures/repo_unit.yml
index 503b8c9dd..ef0b7c1a9 100644
--- a/models/fixtures/repo_unit.yml
+++ b/models/fixtures/repo_unit.yml
@@ -569,3 +569,9 @@
   type: 3
   config: "{\"IgnoreWhitespaceConflicts\":false,\"AllowMerge\":true,\"AllowRebase\":true,\"AllowRebaseMerge\":true,\"AllowSquash\":true}"
   created_unix: 946684810
+
+-
+  id: 84
+  repo_id: 56
+  type: 1
+  created_unix: 946684810
diff --git a/models/fixtures/repository.yml b/models/fixtures/repository.yml
index dd8facb7a..32ba8744d 100644
--- a/models/fixtures/repository.yml
+++ b/models/fixtures/repository.yml
@@ -1634,3 +1634,16 @@
   is_private: true
   num_issues: 1
   status: 0
+
+-
+  id: 56
+  owner_id: 2
+  owner_name: user2
+  lower_name: readme-test
+  name: readme-test
+  default_branch: master
+  is_empty: false
+  is_archived: false
+  is_private: true
+  status: 0
+  num_issues: 0
diff --git a/models/fixtures/user.yml b/models/fixtures/user.yml
index c6081f07d..ce54defac 100644
--- a/models/fixtures/user.yml
+++ b/models/fixtures/user.yml
@@ -66,7 +66,7 @@
   num_followers: 2
   num_following: 1
   num_stars: 2
-  num_repos: 11
+  num_repos: 12
   num_teams: 0
   num_members: 0
   visibility: 0