🌱 Unit tests for dependency_update_tool

Unit tests for dependency_update_tool
 https://github.com/ossf/scorecard/issues/986

Signed-off-by: naveen <172697+naveensrinivasan@users.noreply.github.com>

checks/dependency_update_tool_test.go

@@ -0,0 +1,90 @@
+// Copyright 2020 Security 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 checks
+
+import (
+	"testing"
+
+	"github.com/golang/mock/gomock"
+
+	"github.com/ossf/scorecard/v4/checker"
+	mockrepo "github.com/ossf/scorecard/v4/clients/mockclients"
+	scut "github.com/ossf/scorecard/v4/utests"
+)
+
+// TestDependencyUpdateTool tests the DependencyUpdateTool checker.
+func TestDependencyUpdateTool(t *testing.T) {
+	t.Parallel()
+	//nolint
+	tests := []struct {
+		name     string
+		wantErr  bool
+		files    []string
+		want     checker.CheckResult
+		expected scut.TestReturn
+	}{
+		{
+			name:    "dependency yml",
+			wantErr: false,
+			files: []string{
+				".github/dependabot.yml",
+			},
+			expected: scut.TestReturn{
+				NumberOfInfo: 1,
+				Score:        10,
+			},
+		},
+		{
+			name:    "dependency yaml ",
+			wantErr: false,
+			files: []string{
+				".github/dependabot.yaml",
+			},
+			expected: scut.TestReturn{
+				NumberOfInfo: 1,
+				Score:        10,
+			},
+		},
+		{
+			name:    "foo bar",
+			wantErr: false,
+			files: []string{
+				".github/foobar.yml",
+			},
+			expected: scut.TestReturn{
+				NumberOfWarn: 2,
+			},
+		},
+	}
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			ctrl := gomock.NewController(t)
+			mockRepo := mockrepo.NewMockRepoClient(ctrl)
+			mockRepo.EXPECT().ListFiles(gomock.Any()).Return(tt.files, nil)
+			dl := scut.TestDetailLogger{}
+			c := &checker.CheckRequest{
+				RepoClient: mockRepo,
+				Dlogger:    &dl,
+			}
+			res := DependencyUpdateTool(c)
+
+			if !scut.ValidateTestReturn(t, tt.name, &tt.expected, &res, &dl) {
+				t.Fail()
+			}
+		})
+	}
+}