refactor(internal): export internal packages (#887)

* refactor: export internal packages

* refactor(server): define Server

* refactor: fix lint issues

* test(integration): fix imports

pkg/commands/config/artifact_test.go

@@ -0,0 +1,73 @@
+package config_test
+
+import (
+	"flag"
+	"testing"
+
+	"github.com/aquasecurity/trivy/pkg/commands/config"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/urfave/cli/v2"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zaptest/observer"
+)
+
+func TestArtifactConfig_Init(t *testing.T) {
+	tests := []struct {
+		name    string
+		args    []string
+		logs    []string
+		want    config.ArtifactConfig
+		wantErr string
+	}{
+		{
+			name: "happy path",
+			args: []string{"alpine:3.10"},
+			want: config.ArtifactConfig{
+				Target: "alpine:3.10",
+			},
+		},
+		{
+			name: "sad: multiple image names",
+			args: []string{"centos:7", "alpine:3.10"},
+			logs: []string{
+				"multiple targets cannot be specified",
+			},
+			wantErr: "arguments error",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			core, obs := observer.New(zap.DebugLevel)
+			logger := zap.New(core)
+
+			app := cli.NewApp()
+			set := flag.NewFlagSet("test", 0)
+			ctx := cli.NewContext(app, set, nil)
+			_ = set.Parse(tt.args)
+
+			c := config.NewArtifactConfig(ctx)
+
+			err := c.Init(ctx, logger.Sugar())
+
+			// tests log messages
+			var gotMessages []string
+			for _, entry := range obs.AllUntimed() {
+				gotMessages = append(gotMessages, entry.Message)
+			}
+			assert.Equal(t, tt.logs, gotMessages, tt.name)
+
+			// test the error
+			switch {
+			case tt.wantErr != "":
+				require.NotNil(t, err)
+				assert.Contains(t, err.Error(), tt.wantErr, tt.name)
+				return
+			default:
+				assert.NoError(t, err, tt.name)
+			}
+
+			assert.Equal(t, tt.want, c, tt.name)
+		})
+	}
+}