🌱 Improve gitlabrepo.ListProgrammingLanguages e2e tests (ossf#3309)

* 🌱 Improve `gitlabrepo.ListProgrammingLanguages` e2e tests

- Add an end-to-end test for the `gitlabrepo.ListProgrammingLanguages` function
- Include a test for repos without code to check that no programming languages are returned

[clients/gitlabrepo/languages_e2e_test.go]
- Add an e2e test for the `gitlabrepo.ListProgrammingLanguages` function
- Add a test for repos without code to check that no programming languages are returned

Signed-off-by: naveensrinivasan <[email protected]>

* Increase test accuracy for language e2e tests

- Lower the numeric tolerance for e2e tests in the GitLab repository

[clients/gitlabrepo/languages_e2e_test.go]
- Lower numeric tolerance for test files

Signed-off-by: naveensrinivasan <[email protected]>

---------

Signed-off-by: naveensrinivasan <[email protected]>

clients/gitlabrepo/languages_e2e_test.go

@@ -0,0 +1,64 @@
+// Copyright 2023 OpenSSF Scorecard Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package gitlabrepo
+
+import (
+	"context"
+	"strings"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("E2E TEST: gitlabrepo.ListProgrammingLanguages", func() {
+	Context("Test list programming languages - GitLab", func() {
+		It("returns branches for the repo", func() {
+			repo, err := MakeGitlabRepo("https://gitlab.com/baserow/baserow")
+			Expect(err).Should(BeNil())
+
+			client, err := CreateGitlabClient(context.Background(), repo.Host())
+			Expect(err).Should(BeNil())
+
+			err = client.InitRepo(repo, "HEAD", 0)
+			Expect(err).Should(BeNil())
+			programmingLang, err := client.ListProgrammingLanguages()
+			Expect(err).Should(BeNil())
+			Expect(programmingLang).ShouldNot(BeNil())
+			// Check for the presence of some languages
+			isPythonPresent := false
+			for _, lang := range programmingLang {
+				// compare case insensitive
+				if strings.EqualFold(string(lang.Name), "Python") {
+					isPythonPresent = true
+					break
+				}
+			}
+			Expect(isPythonPresent).Should(BeTrue())
+		})
+		It("Should return no programming languages repo with no code", func() {
+			repo, err := MakeGitlabRepo("https://gitlab.com/ossf-test/scorecard-test-branches")
+			Expect(err).Should(BeNil())
+
+			client, err := CreateGitlabClient(context.Background(), repo.Host())
+			Expect(err).Should(BeNil())
+
+			err = client.InitRepo(repo, "HEAD", 0)
+			Expect(err).Should(BeNil())
+			programmingLang, err := client.ListProgrammingLanguages()
+			Expect(err).Should(BeNil())
+			Expect(programmingLang).Should(BeNil())
+		})
+	})
+})