fstest: add tests for coverage of optional methods for wrapping Fs

fs/fs.go

@@ -370,6 +370,35 @@ type GetTierer interface {
 	GetTier() string
 }
 
+// ObjectOptionalInterfaces returns the names of supported and
+// unsupported optional interfaces for an Object
+func ObjectOptionalInterfaces(o Object) (supported, unsupported []string) {
+	store := func(ok bool, name string) {
+		if ok {
+			supported = append(supported, name)
+		} else {
+			unsupported = append(unsupported, name)
+		}
+	}
+
+	_, ok := o.(MimeTyper)
+	store(ok, "MimeType")
+
+	_, ok = o.(IDer)
+	store(ok, "ID")
+
+	_, ok = o.(ObjectUnWrapper)
+	store(ok, "UnWrap")
+
+	_, ok = o.(SetTierer)
+	store(ok, "SetTier")
+
+	_, ok = o.(GetTierer)
+	store(ok, "GetTier")
+
+	return supported, unsupported
+}
+
 // ListRCallback defines a callback function for ListR to use
 //
 // It is called for each tranche of entries read from the listing and

fstest/fstests/fstests.go

@@ -15,6 +15,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"reflect"
 	"sort"
 	"strings"
 	"testing"
@@ -241,13 +242,27 @@ type ExtraConfigItem struct{ Name, Key, Value string }
 
 // Opt is options for Run
 type Opt struct {
-	RemoteName               string
-	NilObject                fs.Object
-	ExtraConfig              []ExtraConfigItem
-	SkipBadWindowsCharacters bool     // skips unusable characters for windows if set
-	SkipFsMatch              bool     // if set skip exact matching of Fs value
-	TiersToTest              []string // List of tiers which can be tested in setTier test
-	ChunkedUpload            ChunkedUploadConfig
+	RemoteName                   string
+	NilObject                    fs.Object
+	ExtraConfig                  []ExtraConfigItem
+	SkipBadWindowsCharacters     bool     // skips unusable characters for windows if set
+	SkipFsMatch                  bool     // if set skip exact matching of Fs value
+	TiersToTest                  []string // List of tiers which can be tested in setTier test
+	ChunkedUpload                ChunkedUploadConfig
+	UnimplementableFsMethods     []string // List of methods which can't be implemented in this wrapping Fs
+	UnimplementableObjectMethods []string // List of methods which can't be implemented in this wrapping Fs
+	SkipFsCheckWrap              bool     // if set skip FsCheckWrap
+	SkipObjectCheckWrap          bool     // if set skip ObjectCheckWrap
+}
+
+// returns true if x is found in ss
+func stringsContains(x string, ss []string) bool {
+	for _, s := range ss {
+		if x == s {
+			return true
+		}
+	}
+	return false
 }
 
 // Run runs the basic integration tests for a remote using the options passed in.
@@ -360,6 +375,34 @@ func Run(t *testing.T, opt *Opt) {
 	// Skip the rest if it failed
 	skipIfNotOk(t)
 
+	// Check to see if Fs that wrap other Fs implement all the optional methods
+	t.Run("FsCheckWrap", func(t *testing.T) {
+		skipIfNotOk(t)
+		if opt.SkipFsCheckWrap {
+			t.Skip("Skipping FsCheckWrap on this Fs")
+		}
+		ft := new(fs.Features).Fill(remote)
+		if ft.UnWrap == nil {
+			t.Skip("Not a wrapping Fs")
+		}
+		v := reflect.ValueOf(ft).Elem()
+		vType := v.Type()
+		for i := 0; i < v.NumField(); i++ {
+			vName := vType.Field(i).Name
+			if stringsContains(vName, opt.UnimplementableFsMethods) {
+				continue
+			}
+			field := v.Field(i)
+			// skip the bools
+			if field.Type().Kind() == reflect.Bool {
+				continue
+			}
+			if field.IsNil() {
+				t.Errorf("Missing Fs wrapper for %s", vName)
+			}
+		}
+	})
+
 	// TestFsRmdirNotFound tests deleting a non existent directory
 	t.Run("FsRmdirNotFound", func(t *testing.T) {
 		skipIfNotOk(t)
@@ -1367,6 +1410,25 @@ func Run(t *testing.T, opt *Opt) {
 				}
 			})
 
+			// Check to see if Fs that wrap other Objects implement all the optional methods
+			t.Run("ObjectCheckWrap", func(t *testing.T) {
+				skipIfNotOk(t)
+				if opt.SkipObjectCheckWrap {
+					t.Skip("Skipping FsCheckWrap on this Fs")
+				}
+				ft := new(fs.Features).Fill(remote)
+				if ft.UnWrap == nil {
+					t.Skip("Not a wrapping Fs")
+				}
+				obj := findObject(t, remote, file1.Path)
+				_, unsupported := fs.ObjectOptionalInterfaces(obj)
+				for _, name := range unsupported {
+					if !stringsContains(name, opt.UnimplementableObjectMethods) {
+						t.Errorf("Missing Object wrapper for %s", name)
+					}
+				}
+			})
+
 			// TestObjectRemove tests Remove
 			t.Run("ObjectRemove", func(t *testing.T) {
 				skipIfNotOk(t)