test(GetAnalyzers): add unit tests

Author: surajssd

differs/differs_test.go

@@ -0,0 +1,71 @@
+/*
+Copyright 2017 Google, Inc. All rights reserved.
+
+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 differs
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestGetAnalyzers(t *testing.T) {
+
+	tests := []struct {
+		name    string
+		args    []string
+		want    []Analyzer
+		wantErr bool
+	}{
+		{
+			name:    "given only one type",
+			args:    []string{"history"},
+			want:    []Analyzer{HistoryAnalyzer{}},
+			wantErr: false,
+		},
+		{
+			name:    "given two type",
+			args:    []string{"file", "apt"},
+			want:    []Analyzer{FileAnalyzer{}, AptAnalyzer{}},
+			wantErr: false,
+		},
+		{
+			name:    "given non-existent type",
+			args:    []string{"faketype"},
+			want:    nil,
+			wantErr: true,
+		},
+		{
+			name:    "no type given",
+			args:    []string{},
+			want:    nil,
+			wantErr: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := GetAnalyzers(tt.args)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("GetAnalyzers() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			} else if err != nil && tt.wantErr {
+				t.Logf("errored out as = %v", err)
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("GetAnalyzers() = %#v, want %#v", got, tt.want)
+			}
+		})
+	}
+}