.

wcfs/δbtail_test.go

@@ -46,11 +46,13 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-// TreeGen represents connection to running `treegen trees` server.
+
+
+// TreeSrv represents connection to running `treegen trees` server.
 //
-// Create it with StartTreeGen(zurl).
+// Create it with StartTreeSrv(zurl).
 // - Commit(treeTopology) -> tid
-type TreeGen struct {
+type TreeSrv struct {
 	zurl	  string
 	pysrv     *exec.Cmd      // spawned `treegen trees`
 	pyin      io.WriteCloser // input to pysrv
@@ -61,11 +63,11 @@ type TreeGen struct {
 }
 
 // StartTreeGen spawns `treegen trees` server.
-func StartTreeGen(zurl string) (_ *TreeGen, err error) {
+func StartTreeGen(zurl string) (_ *TreeSrv, err error) {
 	defer xerr.Contextf(&err, "treegen %s: start", zurl)
 
 	// spawn `treegen trees`
-	tg := &TreeGen{zurl: zurl}
+	tg := &TreeSrv{zurl: zurl}
 	tg.pysrv = exec.Command("./testprog/treegen.py", "trees", zurl)
 	tg.pyin, err = tg.pysrv.StdinPipe()
 	if err != nil {
@@ -119,7 +121,7 @@ func StartTreeGen(zurl string) (_ *TreeGen, err error) {
 }
 
 // Close shutdowns treegen server.
-func (tg *TreeGen) Close() (err error) {
+func (tg *TreeSrv) Close() (err error) {
 	defer xerr.Contextf(&err, "treegen %s: close", tg.zurl)
 
 	err1 := tg.pyin.Close()
@@ -129,7 +131,7 @@ func (tg *TreeGen) Close() (err error) {
 }
 
 // Commit creates new commit with underlying tree changed to specified tree topology.
-func (tg *TreeGen) Commit(tree string) (_ zodb.Tid, err error) {
+func (tg *TreeSrv) Commit(tree string) (_ zodb.Tid, err error) {
 	defer xerr.Contextf(&err, "treegen %s: commit %s", tg.zurl, tree)
 
 	_, err = io.WriteString(tg.pyin, tree + "\n")
@@ -507,6 +509,7 @@ func TestΔBTreeAllStructs(t *testing.T) {
 			for k := range keys2 { kv2[Key(k)] = randv() }
 
 			// given (kv1, kv2) test on automatically generated (tree1 -> tree2)
+			//reqSeed = rng.Int63()
 			fmt.Printf("%s -> %s\n", kvtxt(kv1), kvtxt(kv2))
 
 			//testq <- ...
@@ -603,6 +606,10 @@ func TestKVDiff(t *testing.T) {
 
 // kvtxt returns string representation of {} kv.
 func kvtxt(kv map[Key]string) string {
+	if len(kv) == 0 {
+		return "ø"
+	}
+
 	keyv := []Key{}
 	for k := range kv { keyv = append(keyv, k) }
 	sort.Slice(keyv, func(i,j int) bool { return keyv[i] < keyv[j] })