feat: update the test.Now the actual is what the output would be like…

… in the terminal.

go.mod

@@ -9,9 +9,10 @@ require (
 )
 
 require (
-	github.com/chengxilo/virtualterm v1.0.3 // indirect
+	github.com/chengxilo/virtualterm v1.0.4 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-runewidth v0.0.16 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	golang.org/x/sys v0.25.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect

go.sum

@@ -1,15 +1,20 @@
 github.com/chengxilo/virtualterm v1.0.3 h1:Vycm/mKGeHuLXA4zK3XsaseOW7VMY6jJ88/9+XHSNcA=
 github.com/chengxilo/virtualterm v1.0.3/go.mod h1:wjAbIDvnp6Vc8hQoM7tt6fcdk0NiSaQBSoSRwMIpphs=
+github.com/chengxilo/virtualterm v1.0.4 h1:Z6IpERbRVlfB8WkOmtbHiDbBANU7cimRIof7mk9/PwM=
+github.com/chengxilo/virtualterm v1.0.4/go.mod h1:DyxxBZz/x1iqJjFxTFcr6/x+jSpqN0iwWCOK1q10rlY=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/k0kubun/go-ansi v0.0.0-20180517002512-3bf9e2903213 h1:qGQQKEcAR99REcMpsXCp3lJ03zYT1PkRd3kQGPn9GVg=
 github.com/k0kubun/go-ansi v0.0.0-20180517002512-3bf9e2903213/go.mod h1:vNUNkEQ1e29fT/6vq2aBdFsgNPmy8qMdSay1npru+Sw=
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mattn/go-runewidth v0.0.16 h1:E5ScNMtiwvlvB5paMFdw9p4kSQzbXFikJ5SQO6TULQc=
+github.com/mattn/go-runewidth v0.0.16/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db h1:62I3jR2EmQ4l5rM/4FEfDWcRD+abF5XlKShorW5LRoQ=
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db/go.mod h1:l0dey0ia/Uv7NcFFVbCLtqEBQbrT4OCwCSKTEv6enCw=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
 github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=

progressbar_test.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"github.com/chengxilo/virtualterm"
 	"io"
+	"log"
 	"net/http"
 	"os"
 	"strings"
@@ -126,11 +127,12 @@ func TestSpinnerFinish(t *testing.T) {
 	bar.Add(10)
 	time.Sleep(1 * time.Second)
 	bar.Finish()
-	result := buf.String()
-	expect := "" +
-		"\r-  (10 B, 10 B/s, 10 it/s) [1s] " +
-		"\r                                \r" +
-		"\r|  (10 B,  5 B/s, 5 it/s) [2s] "
+	result, err := virtualterm.Process(buf.String())
+	if err != nil {
+		t.Error(err)
+	}
+	// the "\r \r"
+	expect := "|  (10 B,  5 B/s, 5 it/s) [2s]  "
 	if result != expect {
 		t.Errorf("Render miss-match\nResult: '%s'\nExpect: '%s'\n%+v", result, expect, bar)
 	}
@@ -213,15 +215,21 @@ func ExampleOptionShowIts_spinner() {
 	/*
 		Spinner test with iteration count and iteration rate
 	*/
+	vt := virtualterm.NewDefault()
 	bar := NewOptions(-1,
 		OptionSetWidth(10),
 		OptionShowIts(),
 		OptionShowCount(),
+		OptionSetWriter(&vt),
 	)
 	bar.Reset()
 	time.Sleep(1 * time.Second)
 	bar.Add(5)
-
+	s, err := vt.String()
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Print(s)
 	// Output:
 	// -  (5/-, 5 it/s) [1s]
 }
@@ -318,17 +326,20 @@ func ExampleOptionShowBytes_spinner() {
 	/*
 		Spinner test with iterations and count
 	*/
+	buf := strings.Builder{}
 	bar := NewOptions(-1,
 		OptionSetWidth(10),
 		OptionShowBytes(true),
+		OptionSetWriter(&buf),
 	)
 
 	bar.Reset()
 	time.Sleep(1 * time.Second)
 	// since 10 is the width and we don't know the max bytes
 	// it will do a infinite scrolling.
 	bar.Add(11)
-
+	result, _ := virtualterm.Process(buf.String())
+	fmt.Print(result)
 	// Output:
 	// -  (11 B/s) [1s]
 }
@@ -494,7 +505,11 @@ func TestOptionSetElapsedTime_spinner(t *testing.T) {
 	bar.Reset()
 	time.Sleep(1 * time.Second)
 	bar.Add(5)
-	result := strings.TrimSpace(buf.String())
+	result, err := virtualterm.Process(buf.String())
+	result = strings.TrimSpace(result)
+	if err != nil {
+		t.Fatal(err)
+	}
 	expect := "-  (5/-, 5 it/s)"
 	if result != expect {
 		t.Errorf("Render miss-match\nResult: '%s'\nExpect: '%s'\n%+v", result, expect, bar)
@@ -928,3 +943,60 @@ func TestProgressBar_StartWithoutRender(t *testing.T) {
 		t.Errorf("Render miss-match\nResult: '%s'\nExpect: '%s'\n%+v", result, expect, bar)
 	}
 }
+
+func TestOptionSetSpinnerChangeInterval(t *testing.T) {
+	interval := 1000 * time.Millisecond
+	vt := virtualterm.NewDefault()
+	actuals := make([]string, 0, 8)
+	expecteds := []string{
+		"◐ test  [0s]",
+		"◓ test  [1s]",
+		"◑ test  [2s]",
+		"◒ test  [3s]",
+		"◐ test  [4s]",
+		"◓ test  [5s]",
+		"◑ test  [6s]",
+		"◒ test  [7s]",
+	}
+	bar := NewOptions(-1,
+		OptionSetDescription("test"),
+		OptionSpinnerType(7),
+		OptionSetWriter(&vt),
+		OptionSetSpinnerChangeInterval(interval))
+	bar.Add(1)
+	for i := 0; i < 8; i++ {
+		s, _ := vt.String()
+		s = strings.TrimSpace(s)
+		actuals = append(actuals, s)
+		// sleep 50 ms more to make sure to go to next interval each time
+		time.Sleep(1050 * time.Millisecond)
+	}
+	for i := range actuals {
+		assert.Equal(t, expecteds[i], actuals[i])
+	}
+}
+
+func TestOptionSetSpinnerChangeIntervalZero(t *testing.T) {
+	vt := virtualterm.NewDefault()
+	bar := NewOptions(-1,
+		OptionSetDescription("test"),
+		OptionSpinnerType(7),
+		OptionSetWriter(&vt),
+		OptionSetSpinnerChangeInterval(0))
+	actuals := make([]string, 0, 5)
+	expected := []string{
+		"◐ test  [0s]",
+		"◓ test  [1s]",
+		"◑ test  [2s]",
+		"◒ test  [3s]",
+		"◐ test  [4s]",
+	}
+	for i := 0; i < 5; i++ {
+		bar.Add(1)
+		s, _ := vt.String()
+		s = strings.TrimSpace(s)
+	}
+	for i := range actuals {
+		assert.Equal(t, expected[i], actuals[i])
+	}
+}