Backup details list exchange tests (#945)

## Description

Add tests for the `backup list exchange` subcommand. Tests mostly center around indirectly testing how selectors are created and used in this subcommand by checking the output of running the `Reduce` call on a known set of `details.DetailsEntry`s. Also check various error cases

Tests for invalid formats of flag values are disabled as that code does not currently exist. These tests can be enabled when #943 is resolved

## Type of change

<!--- Please check the type of change your PR introduces: --->
- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [x] 🤖 Test
- [ ] 💻 CI/Deployment
- [ ] 🐹 Trivial/Minor

## Issue(s)

* #913

## Test Plan

<!-- How will this be tested prior to merging.-->
- [ ] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E

src/cli/backup/exchange.go

@@ -1,6 +1,8 @@
 package backup
 
 import (
+	"context"
+
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
@@ -11,6 +13,7 @@ import (
 	"github.com/alcionai/corso/src/cli/utils"
 	"github.com/alcionai/corso/src/internal/model"
 	"github.com/alcionai/corso/src/pkg/backup"
+	"github.com/alcionai/corso/src/pkg/backup/details"
 	"github.com/alcionai/corso/src/pkg/control"
 	"github.com/alcionai/corso/src/pkg/repository"
 	"github.com/alcionai/corso/src/pkg/selectors"
@@ -353,11 +356,6 @@ func detailsExchangeCmd(cmd *cobra.Command, args []string) error {
 
 	defer utils.CloseRepo(ctx, r)
 
-	d, _, err := r.BackupDetails(ctx, backupID)
-	if err != nil {
-		return Only(ctx, errors.Wrap(err, "Failed to get backup details in the repository"))
-	}
-
 	opts := utils.ExchangeOpts{
 		Contacts:            contact,
 		ContactFolders:      contactFolder,
@@ -378,6 +376,34 @@ func detailsExchangeCmd(cmd *cobra.Command, args []string) error {
 		EventSubject:        eventSubject,
 	}
 
+	ds, err := runDetailsExchangeCmd(ctx, r, backupID, opts)
+	if err != nil {
+		return Only(ctx, err)
+	}
+
+	if len(ds.Entries) == 0 {
+		Info(ctx, selectors.ErrorNoMatchingItems)
+		return nil
+	}
+
+	ds.PrintEntries(ctx)
+
+	return nil
+}
+
+// runDetailsExchangeCmd actually performs the lookup in backup details. Assumes
+// len(backupID) > 0.
+func runDetailsExchangeCmd(
+	ctx context.Context,
+	r repository.BackupGetter,
+	backupID string,
+	opts utils.ExchangeOpts,
+) (*details.Details, error) {
+	d, _, err := r.BackupDetails(ctx, backupID)
+	if err != nil {
+		return nil, errors.Wrap(err, "Failed to get backup details in the repository")
+	}
+
 	sel := selectors.NewExchangeRestore()
 	utils.IncludeExchangeRestoreDataSelectors(sel, opts)
 	utils.FilterExchangeRestoreInfoSelectors(sel, opts)
@@ -387,15 +413,7 @@ func detailsExchangeCmd(cmd *cobra.Command, args []string) error {
 		sel.Include(sel.Users(selectors.Any()))
 	}
 
-	ds := sel.Reduce(ctx, d)
-	if len(ds.Entries) == 0 {
-		Info(ctx, selectors.ErrorNoMatchingItems)
-		return nil
-	}
-
-	ds.PrintEntries(ctx)
-
-	return nil
+	return sel.Reduce(ctx, d), nil
 }
 
 // ------------------------------------------------------------------------------------------------

src/cli/backup/exchange_test.go

@@ -1,6 +1,7 @@
 package backup
 
 import (
+	"context"
 	"testing"
 
 	"github.com/spf13/cobra"
@@ -9,6 +10,7 @@ import (
 	"github.com/stretchr/testify/suite"
 
 	"github.com/alcionai/corso/src/cli/utils"
+	"github.com/alcionai/corso/src/cli/utils/testdata"
 	"github.com/alcionai/corso/src/internal/tester"
 )
 
@@ -214,3 +216,56 @@ func (suite *ExchangeSuite) TestExchangeBackupCreateSelectors() {
 		})
 	}
 }
+
+func (suite *ExchangeSuite) TestExchangeBackupDetailsSelectors() {
+	ctx := context.Background()
+
+	for _, test := range testdata.ExchangeOptionDetailLookups {
+		suite.T().Run(test.Name, func(t *testing.T) {
+			output, err := runDetailsExchangeCmd(
+				ctx,
+				test.BackupGetter,
+				"backup-ID",
+				test.Opts,
+			)
+			assert.NoError(t, err)
+
+			assert.ElementsMatch(t, test.Expected, output.Entries)
+		})
+	}
+}
+
+func (suite *ExchangeSuite) TestExchangeBackupDetailsSelectorsBadBackupID() {
+	t := suite.T()
+	ctx := context.Background()
+	backupGetter := &testdata.MockBackupGetter{}
+
+	output, err := runDetailsExchangeCmd(
+		ctx,
+		backupGetter,
+		"backup-ID",
+		utils.ExchangeOpts{},
+	)
+	assert.Error(t, err)
+
+	assert.Empty(t, output)
+}
+
+// TODO(ashmrtn): Uncomment these when the CLI validates flag input values.
+//func (suite *ExchangeSuite) TestExchangeBackupDetailsSelectorsBadFormats() {
+//	ctx := context.Background()
+//
+//	for _, test := range testdata.BadExchangeOptionsFormats {
+//		suite.T().Run(test.Name, func(t *testing.T) {
+//			output, err := runDetailsExchangeCmd(
+//				ctx,
+//				test.BackupGetter,
+//				"backup-ID",
+//				test.Opts,
+//			)
+//			assert.Error(t, err)
+//
+//			assert.Empty(t, output)
+//		})
+//	}
+//}

src/cli/utils/testdata/opts.go

@@ -0,0 +1,181 @@
+package testdata
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"github.com/alcionai/corso/src/cli/utils"
+	"github.com/alcionai/corso/src/internal/common"
+	"github.com/alcionai/corso/src/internal/model"
+	"github.com/alcionai/corso/src/pkg/backup"
+	"github.com/alcionai/corso/src/pkg/backup/details"
+	"github.com/alcionai/corso/src/pkg/selectors"
+	"github.com/alcionai/corso/src/pkg/selectors/testdata"
+)
+
+type ExchangeOptionsTest struct {
+	Name         string
+	Opts         utils.ExchangeOpts
+	BackupGetter *MockBackupGetter
+	Expected     []details.DetailsEntry
+}
+
+var (
+
+	// BadExchangeOptionsFormats contains ExchangeOpts with flags that should
+	// cause errors about the format of the input flag. Mocks are configured to
+	// allow the system to run if it doesn't throw an error on formatting.
+	BadExchangeOptionsFormats = []ExchangeOptionsTest{
+		{
+			Name: "BadEmailReceiveAfter",
+			Opts: utils.ExchangeOpts{
+				EmailReceivedAfter: "foo",
+			},
+		},
+		{
+			Name: "BadEmailReceiveBefore",
+			Opts: utils.ExchangeOpts{
+				EmailReceivedBefore: "foo",
+			},
+		},
+		{
+			Name: "BadEventRecurs",
+			Opts: utils.ExchangeOpts{
+				EventRecurs: "foo",
+			},
+		},
+		{
+			Name: "BadEventStartsAfter",
+			Opts: utils.ExchangeOpts{
+				EventStartsAfter: "foo",
+			},
+		},
+		{
+			Name: "BadEventStartsBefore",
+			Opts: utils.ExchangeOpts{
+				EventStartsBefore: "foo",
+			},
+		},
+	}
+
+	// ExchangeOptionDetailLookups contains flag inputs and expected results for
+	// some choice input patterns. This set is not exhaustive. All inputs and
+	// outputs are according to the data laid out in selectors/testdata. Mocks are
+	// configured to return the full dataset listed in selectors/testdata.
+	ExchangeOptionDetailLookups = []ExchangeOptionsTest{
+		{
+			Name:     "Emails",
+			Expected: testdata.ExchangeEmailItems,
+			Opts: utils.ExchangeOpts{
+				Emails: selectors.Any(),
+			},
+		},
+		{
+			Name:     "EmailsBySubject",
+			Expected: testdata.ExchangeEmailItems,
+			Opts: utils.ExchangeOpts{
+				EmailSender: "a-person",
+			},
+		},
+		{
+			Name: "AllExchange",
+			Expected: append(
+				append(
+					append(
+						[]details.DetailsEntry{},
+						testdata.ExchangeEmailItems...,
+					),
+					testdata.ExchangeContactsItems...,
+				),
+				testdata.ExchangeEventsItems...,
+			),
+		},
+		{
+			Name:     "MailReceivedTime",
+			Expected: []details.DetailsEntry{testdata.ExchangeEmailItems[0]},
+			Opts: utils.ExchangeOpts{
+				EmailReceivedBefore: common.FormatTime(testdata.Time1.Add(time.Second)),
+			},
+		},
+		{
+			Name:     "MailID",
+			Expected: []details.DetailsEntry{testdata.ExchangeEmailItems[0]},
+			Opts: utils.ExchangeOpts{
+				Emails: []string{testdata.ExchangeEmailItemPath1.Item()},
+			},
+		},
+		{
+			Name:     "MailShortRef",
+			Expected: []details.DetailsEntry{testdata.ExchangeEmailItems[0]},
+			Opts: utils.ExchangeOpts{
+				Emails: []string{testdata.ExchangeEmailItemPath1.ShortRef()},
+			},
+		},
+		{
+			Name:     "MultipleMailShortRef",
+			Expected: testdata.ExchangeEmailItems,
+			Opts: utils.ExchangeOpts{
+				Emails: []string{
+					testdata.ExchangeEmailItemPath1.ShortRef(),
+					testdata.ExchangeEmailItemPath2.ShortRef(),
+				},
+			},
+		},
+		{
+			Name:     "AllEventsAndMailWithSubject",
+			Expected: []details.DetailsEntry{testdata.ExchangeEmailItems[0]},
+			Opts: utils.ExchangeOpts{
+				EmailSubject: "foo",
+				Events:       selectors.Any(),
+			},
+		},
+		{
+			Name:     "EventsAndMailWithSubject",
+			Expected: []details.DetailsEntry{},
+			Opts: utils.ExchangeOpts{
+				EmailSubject: "foo",
+				EventSubject: "foo",
+			},
+		},
+		{
+			Name: "EventsAndMailByShortRef",
+			Expected: []details.DetailsEntry{
+				testdata.ExchangeEmailItems[0],
+				testdata.ExchangeEventsItems[0],
+			},
+			Opts: utils.ExchangeOpts{
+				Emails: []string{testdata.ExchangeEmailItemPath1.ShortRef()},
+				Events: []string{testdata.ExchangeEventsItemPath1.ShortRef()},
+			},
+		},
+	}
+)
+
+// MockBackupGetter implements the repo.BackupGetter interface and returns
+// (selectors/testdata.GetDetailsSet(), nil, nil) when BackupDetails is called
+// on the nil instance. If an instance is given or Backups is called returns an
+// error.
+type MockBackupGetter struct{}
+
+func (MockBackupGetter) Backup(
+	context.Context,
+	model.StableID,
+) (*backup.Backup, error) {
+	return nil, errors.New("unexpected call to mock")
+}
+
+func (MockBackupGetter) Backups(context.Context) ([]backup.Backup, error) {
+	return nil, errors.New("unexpected call to mock")
+}
+
+func (bg *MockBackupGetter) BackupDetails(
+	ctx context.Context,
+	backupID string,
+) (*details.Details, *backup.Backup, error) {
+	if bg == nil {
+		return testdata.GetDetailsSet(), nil, nil
+	}
+
+	return nil, nil, errors.New("unexpected call to mock")
+}