fixed test build error

models/repo_test.go

 			Convey("It should be nil even if other settings are present", func() {
 				repo.EnableExternalTracker = false
 				repo.ExternalTrackerFormat = "http://someurl.com/{user}/{repo}/{issue}"
-				repo.ExternalTrackerStyle = markdown.ISSUE_NAME_STYLE_NUMERIC
+				repo.ExternalTrackerStyle = markdown.IssueNameStyleNumeric
 				So(repo.ComposeMetas(), ShouldEqual, map[string]string(nil))
 			})
 		})
 			repo.EnableExternalTracker = true
 			Convey("It should default to numeric issue style", func() {
 				metas := repo.ComposeMetas()
-				So(metas["style"], ShouldEqual, markdown.ISSUE_NAME_STYLE_NUMERIC)
+				So(metas["style"], ShouldEqual, markdown.IssueNameStyleNumeric)
 			})
 			Convey("It should pass through numeric issue style setting", func() {
-				repo.ExternalTrackerStyle = markdown.ISSUE_NAME_STYLE_NUMERIC
+				repo.ExternalTrackerStyle = markdown.IssueNameStyleNumeric
 				metas := repo.ComposeMetas()
-				So(metas["style"], ShouldEqual, markdown.ISSUE_NAME_STYLE_NUMERIC)
+				So(metas["style"], ShouldEqual, markdown.IssueNameStyleNumeric)
 			})
 			Convey("It should pass through alphanumeric issue style setting", func() {
-				repo.ExternalTrackerStyle = markdown.ISSUE_NAME_STYLE_ALPHANUMERIC
+				repo.ExternalTrackerStyle = markdown.IssueNameStyleAlphanumeric
 				metas := repo.ComposeMetas()
-				So(metas["style"], ShouldEqual, markdown.ISSUE_NAME_STYLE_ALPHANUMERIC)
+				So(metas["style"], ShouldEqual, markdown.IssueNameStyleAlphanumeric)
 			})
 			Convey("It should contain the user name", func() {
 				metas := repo.ComposeMetas()

modules/markdown/markdown_test.go

 			metas["format"] = "https://someurl.com/{user}/{repo}/{index}"
 			metas["user"] = "someuser"
 			metas["repo"] = "somerepo"
-			metas["style"] = ISSUE_NAME_STYLE_NUMERIC
+			metas["style"] = IssueNameStyleNumeric
 
 			Convey("should not render anything when there are no mentions", func() {
 				testCases := []string{
 			metas["format"] = "https://someurl.com/{user}/{repo}/?b={index}"
 			metas["user"] = "someuser"
 			metas["repo"] = "somerepo"
-			metas["style"] = ISSUE_NAME_STYLE_ALPHANUMERIC
+			metas["style"] = IssueNameStyleAlphanumeric
 			Convey("It should not render anything when there are no mentions", func() {
 				testCases := []string{
 					"",