diff --git a/boomer.go b/boomer.go
index e7b17262..37d4100e 100644
--- a/boomer.go
+++ b/boomer.go
@@ -47,7 +47,7 @@ func (b *Boomer) Run(testcases ...ITestCase) {
 }
 
 func (b *Boomer) convertBoomerTask(testcase *TestCase) *boomer.Task {
-	runner := NewRunner().SetDebug(b.debug)
+	runner := NewRunner(nil).SetDebug(b.debug)
 	return &boomer.Task{
 		Name:   testcase.Config.Name,
 		Weight: testcase.Config.Weight,
diff --git a/docs/cmd/hrp.md b/docs/cmd/hrp.md
index 823679f5..69efd4da 100644
--- a/docs/cmd/hrp.md
+++ b/docs/cmd/hrp.md
@@ -22,4 +22,4 @@ Copyright 2021 debugtalk
 * [hrp har2case](hrp_har2case.md)	 - Convert HAR to json/yaml testcase files
 * [hrp run](hrp_run.md)	 - run API test
 
-###### Auto generated by spf13/cobra on 17-Oct-2021
+###### Auto generated by spf13/cobra on 11-Nov-2021
diff --git a/docs/cmd/hrp_boom.md b/docs/cmd/hrp_boom.md
index be67ff61..f2840b48 100644
--- a/docs/cmd/hrp_boom.md
+++ b/docs/cmd/hrp_boom.md
@@ -37,4 +37,4 @@ hrp boom [flags]
 
 * [hrp](hrp.md)	 - One-stop solution for HTTP(S) testing.
 
-###### Auto generated by spf13/cobra on 17-Oct-2021
+###### Auto generated by spf13/cobra on 11-Nov-2021
diff --git a/docs/cmd/hrp_har2case.md b/docs/cmd/hrp_har2case.md
index 667710f7..c9b8baea 100644
--- a/docs/cmd/hrp_har2case.md
+++ b/docs/cmd/hrp_har2case.md
@@ -23,4 +23,4 @@ hrp har2case harPath... [flags]
 
 * [hrp](hrp.md)	 - One-stop solution for HTTP(S) testing.
 
-###### Auto generated by spf13/cobra on 17-Oct-2021
+###### Auto generated by spf13/cobra on 11-Nov-2021
diff --git a/docs/cmd/hrp_run.md b/docs/cmd/hrp_run.md
index 31ffd557..f580ce58 100644
--- a/docs/cmd/hrp_run.md
+++ b/docs/cmd/hrp_run.md
@@ -30,4 +30,4 @@ hrp run path... [flags]
 
 * [hrp](hrp.md)	 - One-stop solution for HTTP(S) testing.
 
-###### Auto generated by spf13/cobra on 17-Oct-2021
+###### Auto generated by spf13/cobra on 11-Nov-2021
diff --git a/examples/demo_test.go b/examples/demo_test.go
index ab654e7b..b31cf880 100644
--- a/examples/demo_test.go
+++ b/examples/demo_test.go
@@ -79,7 +79,7 @@ func TestGenDemoTestCase(t *testing.T) {
 }
 
 func Example_TestCase() {
-	err := hrp.NewRunner().Run(demoTestCase)
+	err := hrp.NewRunner(nil).Run(demoTestCase) // hrp.Run(demoTestCase)
 	fmt.Println(err)
 	// Output:
 	// <nil>
@@ -87,7 +87,7 @@ func Example_TestCase() {
 
 func Example_JSONTestCase() {
 	testCase := &hrp.TestCasePath{Path: demoTestCaseJSONPath}
-	err := hrp.NewRunner().Run(testCase)
+	err := hrp.NewRunner(nil).Run(testCase) // hrp.Run(testCase)
 	fmt.Println(err)
 	// Output:
 	// <nil>
@@ -95,7 +95,7 @@ func Example_JSONTestCase() {
 
 func Example_YAMTestCase() {
 	testCase := &hrp.TestCasePath{Path: demoTestCaseYAMLPath}
-	err := hrp.NewRunner().Run(testCase)
+	err := hrp.NewRunner(nil).Run(testCase) // hrp.Run(testCase)
 	fmt.Println(err)
 	// Output:
 	// <nil>
diff --git a/examples/extract_test.go b/examples/extract_test.go
index 67e8a654..7f3891bf 100644
--- a/examples/extract_test.go
+++ b/examples/extract_test.go
@@ -37,7 +37,7 @@ func TestCaseExtractStepSingle(t *testing.T) {
 		},
 	}
 
-	err := hrp.Run(t, testcase)
+	err := hrp.NewRunner(t).Run(testcase)
 	if err != nil {
 		t.Fatalf("run testcase error: %v", err)
 	}
@@ -82,7 +82,7 @@ func TestCaseExtractStepAssociation(t *testing.T) {
 		},
 	}
 
-	err := hrp.Run(t, testcase)
+	err := hrp.NewRunner(t).Run(testcase)
 	if err != nil {
 		t.Fatalf("run testcase error: %v", err)
 	}
diff --git a/examples/function_test.go b/examples/function_test.go
index 768224af..2ae4d642 100644
--- a/examples/function_test.go
+++ b/examples/function_test.go
@@ -40,7 +40,7 @@ func TestCaseCallFunction(t *testing.T) {
 		},
 	}
 
-	err := hrp.Run(t, testcase)
+	err := hrp.NewRunner(t).Run(testcase)
 	if err != nil {
 		t.Fatalf("run testcase error: %v", err)
 	}
diff --git a/examples/request_test.go b/examples/request_test.go
index c0d41b55..a17047a5 100644
--- a/examples/request_test.go
+++ b/examples/request_test.go
@@ -70,7 +70,7 @@ func TestCaseBasicRequest(t *testing.T) {
 		},
 	}
 
-	err := hrp.Run(t, testcase)
+	err := hrp.NewRunner(t).Run(testcase)
 	if err != nil {
 		t.Fatalf("run testcase error: %v", err)
 	}
diff --git a/examples/validate_test.go b/examples/validate_test.go
index 42cf508f..17f768ca 100644
--- a/examples/validate_test.go
+++ b/examples/validate_test.go
@@ -51,7 +51,7 @@ func TestCaseValidateStep(t *testing.T) {
 		},
 	}
 
-	err := hrp.Run(t, testcase)
+	err := hrp.NewRunner(t).Run(testcase)
 	if err != nil {
 		t.Fatalf("run testcase error: %v", err)
 	}
diff --git a/examples/variables_test.go b/examples/variables_test.go
index edf22cf2..2d4f4c55 100644
--- a/examples/variables_test.go
+++ b/examples/variables_test.go
@@ -33,7 +33,7 @@ func TestCaseConfigVariables(t *testing.T) {
 		},
 	}
 
-	err := hrp.Run(t, testcase)
+	err := hrp.NewRunner(t).Run(testcase)
 	if err != nil {
 		t.Fatalf("run testcase error: %v", err)
 	}
@@ -66,7 +66,7 @@ func TestCaseStepVariables(t *testing.T) {
 		},
 	}
 
-	err := hrp.Run(t, testcase)
+	err := hrp.NewRunner(t).Run(testcase)
 	if err != nil {
 		t.Fatalf("run testcase error: %v", err)
 	}
@@ -104,7 +104,7 @@ func TestCaseOverrideConfigVariables(t *testing.T) {
 		},
 	}
 
-	err := hrp.Run(t, testcase)
+	err := hrp.NewRunner(t).Run(testcase)
 	if err != nil {
 		t.Fatalf("run testcase error: %v", err)
 	}
@@ -151,7 +151,7 @@ func TestCaseParseVariables(t *testing.T) {
 		},
 	}
 
-	err := hrp.Run(t, testcase)
+	err := hrp.NewRunner(t).Run(testcase)
 	if err != nil {
 		t.Fatalf("run testcase error: %v", err)
 	}
diff --git a/hrp/cmd/run.go b/hrp/cmd/run.go
index 782cff8c..6cf20870 100644
--- a/hrp/cmd/run.go
+++ b/hrp/cmd/run.go
@@ -20,7 +20,7 @@ var runCmd = &cobra.Command{
 		for _, arg := range args {
 			paths = append(paths, &hrp.TestCasePath{Path: arg})
 		}
-		runner := hrp.NewRunner().SetDebug(!silentFlag)
+		runner := hrp.NewRunner(nil).SetDebug(!silentFlag)
 		if proxyUrl != "" {
 			runner.SetProxyUrl(proxyUrl)
 		}
diff --git a/runner.go b/runner.go
index c56d0b8c..8acc56af 100644
--- a/runner.go
+++ b/runner.go
@@ -18,13 +18,17 @@ import (
 )
 
 // run API test with default configs
-func Run(t *testing.T, testcases ...ITestCase) error {
-	return NewRunner().WithTestingT(t).SetDebug(true).Run(testcases...)
+func Run(testcases ...ITestCase) error {
+	t := &testing.T{}
+	return NewRunner(t).SetDebug(true).Run(testcases...)
 }
 
-func NewRunner() *Runner {
+func NewRunner(t *testing.T) *Runner {
+	if t == nil {
+		t = &testing.T{}
+	}
 	return &Runner{
-		t:     &testing.T{},
+		t:     t,
 		debug: false, // default to turn off debug
 		client: &http.Client{
 			Transport: &http.Transport{
@@ -41,12 +45,6 @@ type Runner struct {
 	client *http.Client
 }
 
-func (r *Runner) WithTestingT(t *testing.T) *Runner {
-	log.Info().Msg("[init] WithTestingT")
-	r.t = t
-	return r
-}
-
 func (r *Runner) SetDebug(debug bool) *Runner {
 	log.Info().Bool("debug", debug).Msg("[init] SetDebug")
 	r.debug = debug
diff --git a/runner_test.go b/runner_test.go
index 3328a436..72476dde 100644
--- a/runner_test.go
+++ b/runner_test.go
@@ -32,7 +32,7 @@ func TestHttpRunner(t *testing.T) {
 	}
 	testcase3 := &TestCasePath{demoTestCaseJSONPath}
 
-	err := Run(t, testcase1, testcase2, testcase3)
+	err := NewRunner(t).Run(testcase1, testcase2, testcase3)
 	if err != nil {
 		t.Fatalf("run testcase error: %v", err)
 	}
diff --git a/step_test.go b/step_test.go
index a41d3cb8..1f2e56e1 100644
--- a/step_test.go
+++ b/step_test.go
@@ -77,7 +77,7 @@ func TestRunRequestRun(t *testing.T) {
 	config := &TConfig{
 		BaseURL: "https://postman-echo.com",
 	}
-	runner := NewRunner().SetDebug(true).WithTestingT(t)
+	runner := NewRunner(t).SetDebug(true)
 	if _, err := runner.runStep(stepGET, config); err != nil {
 		t.Fatalf("tStep.Run() error: %s", err)
 	}