Move issues related files into models/issues (#19931)

* Move access and repo permission to models/perm/access

* fix test

* fix git test

* Move functions sequence

* Some improvements per @KN4CK3R and @delvh

* Move issues related code to models/issues

* Move some issues related sub package

* Merge

* Fix test

* Fix test

* Fix test

* Fix test

* Rename some files

models/issues/dependency_test.go

@@ -0,0 +1,63 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package issues_test
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	issues_model "code.gitea.io/gitea/models/issues"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCreateIssueDependency(t *testing.T) {
+	// Prepare
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	user1, err := user_model.GetUserByID(1)
+	assert.NoError(t, err)
+
+	issue1, err := issues_model.GetIssueByID(db.DefaultContext, 1)
+	assert.NoError(t, err)
+
+	issue2, err := issues_model.GetIssueByID(db.DefaultContext, 2)
+	assert.NoError(t, err)
+
+	// Create a dependency and check if it was successful
+	err = issues_model.CreateIssueDependency(user1, issue1, issue2)
+	assert.NoError(t, err)
+
+	// Do it again to see if it will check if the dependency already exists
+	err = issues_model.CreateIssueDependency(user1, issue1, issue2)
+	assert.Error(t, err)
+	assert.True(t, issues_model.IsErrDependencyExists(err))
+
+	// Check for circular dependencies
+	err = issues_model.CreateIssueDependency(user1, issue2, issue1)
+	assert.Error(t, err)
+	assert.True(t, issues_model.IsErrCircularDependency(err))
+
+	_ = unittest.AssertExistsAndLoadBean(t, &issues_model.Comment{Type: issues_model.CommentTypeAddDependency, PosterID: user1.ID, IssueID: issue1.ID})
+
+	// Check if dependencies left is correct
+	left, err := issues_model.IssueNoDependenciesLeft(db.DefaultContext, issue1)
+	assert.NoError(t, err)
+	assert.False(t, left)
+
+	// Close #2 and check again
+	_, err = issues_model.ChangeIssueStatus(db.DefaultContext, issue2, user1, true)
+	assert.NoError(t, err)
+
+	left, err = issues_model.IssueNoDependenciesLeft(db.DefaultContext, issue1)
+	assert.NoError(t, err)
+	assert.True(t, left)
+
+	// Test removing the dependency
+	err = issues_model.RemoveIssueDependency(user1, issue1, issue2, issues_model.DependencyTypeBlockedBy)
+	assert.NoError(t, err)
+}