diff --git a/cmd/convert.go b/cmd/convert.go
index d4a67a2..0e0ee0c 100644
--- a/cmd/convert.go
+++ b/cmd/convert.go
@@ -1,11 +1,13 @@
 package cmd
 
 import (
+	"bytes"
 	"github.com/linuxsuren/github-action-workflow/pkg"
 	"github.com/spf13/cobra"
 	"golang.org/x/exp/maps"
 	"gopkg.in/yaml.v2"
 	"os"
+	"path/filepath"
 	"strings"
 )
 
@@ -26,14 +28,50 @@ func newConvertCmd() (c *cobra.Command) {
 }
 
 func (o *convertOption) runE(cmd *cobra.Command, args []string) (err error) {
-	gh := &pkg.Workflow{}
-	var data []byte
-	if data, err = os.ReadFile(args[0]); err == nil {
-		if err = yaml.Unmarshal(data, gh); err != nil {
+	var result string
+	if result, err = o.convertWorkflowsFromFilePath(args[0]); err == nil {
+		cmd.Println(result)
+	}
+	return
+}
+
+func (o *convertOption) convertWorkflowsFromFilePath(targetPath string) (result string, err error) {
+	var ghs []*pkg.Workflow
+	var files []string
+	if files, err = filepath.Glob(targetPath); err == nil {
+		for _, file := range files {
+			var data []byte
+			if data, err = os.ReadFile(file); err == nil {
+				gh := &pkg.Workflow{}
+				if err = yaml.Unmarshal(data, gh); err == nil {
+					ghs = append(ghs, gh)
+					continue
+				}
+			}
 			return
 		}
+		result, err = o.convertWorkflows(ghs)
 	}
+	return
+}
 
+func (o *convertOption) convertWorkflows(ghs []*pkg.Workflow) (output string, err error) {
+	buf := bytes.Buffer{}
+
+	var result string
+	for i := range ghs {
+		if result, err = o.convert(ghs[i]); err != nil {
+			return
+		}
+
+		buf.WriteString("\n---\n")
+		buf.WriteString(strings.TrimSpace(result))
+	}
+	output = buf.String()
+	return
+}
+
+func (o *convertOption) convert(gh *pkg.Workflow) (output string, err error) {
 	for i, job := range gh.Jobs {
 		for j, step := range job.Steps {
 			if step.Env == nil {
@@ -44,10 +82,7 @@ func (o *convertOption) runE(cmd *cobra.Command, args []string) (err error) {
 		}
 	}
 
-	var result string
-	if result, err = gh.ConvertToArgoWorkflow(); err == nil {
-		cmd.Println(strings.TrimSpace(result))
-	}
+	output, err = gh.ConvertToArgoWorkflow()
 	return
 }
 
diff --git a/cmd/convert_test.go b/cmd/convert_test.go
new file mode 100644
index 0000000..6b9a319
--- /dev/null
+++ b/cmd/convert_test.go
@@ -0,0 +1,261 @@
+package cmd
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/linuxsuren/github-action-workflow/pkg"
+	"github.com/spf13/cobra"
+	"github.com/stretchr/testify/assert"
+	"os"
+	"testing"
+)
+
+func TestCmdConvert(t *testing.T) {
+	command := newConvertCmd()
+	assert.Equal(t, "convert", command.Use)
+}
+
+func Test_convertOption_convert(t *testing.T) {
+	type fields struct {
+		env map[string]string
+	}
+	type args struct {
+		gh *pkg.Workflow
+	}
+	tests := []struct {
+		name       string
+		fields     fields
+		args       args
+		wantOutput string
+		wantErr    bool
+	}{{
+		name: "simple",
+		args: args{
+			gh: &pkg.Workflow{
+				Name: "simple",
+				Jobs: map[string]pkg.Job{
+					"simple": {
+						Name: "test",
+						Steps: []pkg.Step{{
+							Name: "test",
+							Run:  "echo 1",
+						}},
+					},
+				}},
+		},
+		wantOutput: "data/one-workflow.yaml",
+	}, {
+		name: "workflow with env",
+		args: args{
+			gh: &pkg.Workflow{
+				Name: "simple",
+				Jobs: map[string]pkg.Job{
+					"simple": {
+						Name: "test",
+						Steps: []pkg.Step{{
+							Name: "test",
+							Run:  "echo 1",
+							Env:  map[string]string{},
+						}},
+					},
+				}},
+		},
+		fields:     fields{env: map[string]string{"key": "value"}},
+		wantOutput: "data/one-workflow-env.yaml",
+	}}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			o := &convertOption{
+				env: tt.fields.env,
+			}
+			gotOutput, err := o.convert(tt.args.gh)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("convert() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if data, err := os.ReadFile(tt.wantOutput); err == nil {
+				tt.wantOutput = string(data)
+			}
+			assert.Equal(t, tt.wantOutput, gotOutput)
+		})
+	}
+}
+
+func Test_convertOption_convertWorkflows(t *testing.T) {
+	type fields struct {
+		env map[string]string
+	}
+	type args struct {
+		ghs []*pkg.Workflow
+	}
+	tests := []struct {
+		name       string
+		fields     fields
+		args       args
+		wantOutput string
+		wantErr    assert.ErrorAssertionFunc
+	}{{
+		name: "two workflows",
+		args: args{
+			ghs: []*pkg.Workflow{{
+				Name: "simple",
+				Jobs: map[string]pkg.Job{
+					"simple": {
+						Name: "test",
+						Steps: []pkg.Step{{
+							Name: "test",
+							Run:  "echo 1",
+							Env:  map[string]string{},
+						}},
+					},
+				}}, {
+				Name: "simple",
+				Jobs: map[string]pkg.Job{
+					"simple": {
+						Name: "test",
+						Steps: []pkg.Step{{
+							Name: "test",
+							Run:  "echo 1",
+							Env:  map[string]string{},
+						}},
+					},
+				}}},
+		},
+		wantOutput: "data/combine-workflow.yaml",
+		wantErr: func(t assert.TestingT, err error, i ...interface{}) bool {
+			return true
+		},
+	}}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			o := &convertOption{
+				env: tt.fields.env,
+			}
+			gotOutput, err := o.convertWorkflows(tt.args.ghs)
+			if !tt.wantErr(t, err, fmt.Sprintf("convertWorkflows(%v)", tt.args.ghs)) {
+				return
+			}
+			if data, err := os.ReadFile(tt.wantOutput); err == nil {
+				tt.wantOutput = string(data)
+			}
+			assert.Equal(t, tt.wantOutput, gotOutput)
+		})
+	}
+}
+
+func Test_convertOption_convertWorkflowsFromFilePath(t *testing.T) {
+	type fields struct {
+		env map[string]string
+	}
+	type args struct {
+		targetPath string
+	}
+	tests := []struct {
+		name       string
+		fields     fields
+		args       args
+		wantResult string
+		wantErr    assert.ErrorAssertionFunc
+	}{{
+		name:       "one github workflow",
+		args:       args{targetPath: "data/github-workflow-*.yaml"},
+		wantResult: simpleWorkflow,
+		wantErr: func(t assert.TestingT, err error, i ...interface{}) bool {
+			assert.Nil(t, err)
+			return true
+		},
+	}}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			o := &convertOption{
+				env: tt.fields.env,
+			}
+			gotResult, err := o.convertWorkflowsFromFilePath(tt.args.targetPath)
+			if !tt.wantErr(t, err, fmt.Sprintf("convertWorkflowsFromFilePath(%v)", tt.args.targetPath)) {
+				return
+			}
+			assert.Equalf(t, tt.wantResult, gotResult, "convertWorkflowsFromFilePath(%v)", tt.args.targetPath)
+		})
+	}
+}
+
+const simpleWorkflow = `
+---
+apiVersion: argoproj.io/v1alpha1
+kind: WorkflowTemplate
+metadata:
+  name: build
+spec:
+  entrypoint: main
+  volumeClaimTemplates:
+    - metadata:
+        name: work
+      spec:
+        accessModes: ["ReadWriteOnce"]
+        resources:
+          requests:
+            storage: 64Mi
+
+  templates:
+    - name: main
+      dag:
+        tasks:
+          - name: test
+            template: test
+    - name: test
+      script:
+        image: alpine
+        command: [sh]
+        source: |
+          go test ./... -coverprofile coverage.out
+        volumeMounts:
+          - mountPath: /work
+            name: work
+        workingDir: /work`
+
+func Test_convertOption_runE(t *testing.T) {
+	type fields struct {
+		env map[string]string
+	}
+	type args struct {
+		cmd  *cobra.Command
+		args []string
+	}
+	tests := []struct {
+		name    string
+		fields  fields
+		args    args
+		prepare func(c *cobra.Command) *bytes.Buffer
+		check   func(t assert.TestingT, buf *bytes.Buffer)
+		wantErr assert.ErrorAssertionFunc
+	}{{
+		name: "simple",
+		args: args{
+			cmd:  &cobra.Command{},
+			args: []string{"data/github-workflow-*.yaml"},
+		},
+		prepare: func(c *cobra.Command) *bytes.Buffer {
+			buf := bytes.Buffer{}
+			c.SetOut(&buf)
+			return &buf
+		},
+		check: func(t assert.TestingT, buf *bytes.Buffer) {
+			assert.Equal(t, simpleWorkflow+"\n", buf.String())
+		},
+		wantErr: func(t assert.TestingT, err error, i ...interface{}) bool {
+			assert.Nil(t, err)
+			return true
+		},
+	}}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			o := &convertOption{
+				env: tt.fields.env,
+			}
+			buf := tt.prepare(tt.args.cmd)
+			err := o.runE(tt.args.cmd, tt.args.args)
+			tt.check(t, buf)
+			tt.wantErr(t, err, fmt.Sprintf("runE(%v, %v)", tt.args.cmd, tt.args.args))
+		})
+	}
+}
diff --git a/cmd/data/combine-workflow.yaml b/cmd/data/combine-workflow.yaml
new file mode 100644
index 0000000..40844ff
--- /dev/null
+++ b/cmd/data/combine-workflow.yaml
@@ -0,0 +1,65 @@
+
+---
+apiVersion: argoproj.io/v1alpha1
+kind: WorkflowTemplate
+metadata:
+  name: simple
+spec:
+  entrypoint: main
+  volumeClaimTemplates:
+    - metadata:
+        name: work
+      spec:
+        accessModes: ["ReadWriteOnce"]
+        resources:
+          requests:
+            storage: 64Mi
+
+  templates:
+    - name: main
+      dag:
+        tasks:
+          - name: test
+            template: test
+    - name: test
+      script:
+        image: alpine
+        command: [sh]
+        source: |
+          echo 1
+        volumeMounts:
+          - mountPath: /work
+            name: work
+        workingDir: /work
+---
+apiVersion: argoproj.io/v1alpha1
+kind: WorkflowTemplate
+metadata:
+  name: simple
+spec:
+  entrypoint: main
+  volumeClaimTemplates:
+    - metadata:
+        name: work
+      spec:
+        accessModes: ["ReadWriteOnce"]
+        resources:
+          requests:
+            storage: 64Mi
+
+  templates:
+    - name: main
+      dag:
+        tasks:
+          - name: test
+            template: test
+    - name: test
+      script:
+        image: alpine
+        command: [sh]
+        source: |
+          echo 1
+        volumeMounts:
+          - mountPath: /work
+            name: work
+        workingDir: /work
\ No newline at end of file
diff --git a/cmd/data/github-workflow-simple.yaml b/cmd/data/github-workflow-simple.yaml
new file mode 100644
index 0000000..6a16066
--- /dev/null
+++ b/cmd/data/github-workflow-simple.yaml
@@ -0,0 +1,10 @@
+name: Build
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Test
+        run: |
+          go test ./... -coverprofile coverage.out
\ No newline at end of file
diff --git a/cmd/data/one-workflow-env.yaml b/cmd/data/one-workflow-env.yaml
new file mode 100644
index 0000000..fdf6663
--- /dev/null
+++ b/cmd/data/one-workflow-env.yaml
@@ -0,0 +1,34 @@
+apiVersion: argoproj.io/v1alpha1
+kind: WorkflowTemplate
+metadata:
+  name: simple
+spec:
+  entrypoint: main
+  volumeClaimTemplates:
+    - metadata:
+        name: work
+      spec:
+        accessModes: ["ReadWriteOnce"]
+        resources:
+          requests:
+            storage: 64Mi
+
+  templates:
+    - name: main
+      dag:
+        tasks:
+          - name: test
+            template: test
+    - name: test
+      script:
+        image: alpine
+        command: [sh]
+        env:
+          - name: key
+            value: value
+        source: |
+          echo 1
+        volumeMounts:
+          - mountPath: /work
+            name: work
+        workingDir: /work
\ No newline at end of file
diff --git a/cmd/data/one-workflow.yaml b/cmd/data/one-workflow.yaml
new file mode 100644
index 0000000..7e9a97b
--- /dev/null
+++ b/cmd/data/one-workflow.yaml
@@ -0,0 +1,31 @@
+apiVersion: argoproj.io/v1alpha1
+kind: WorkflowTemplate
+metadata:
+  name: simple
+spec:
+  entrypoint: main
+  volumeClaimTemplates:
+    - metadata:
+        name: work
+      spec:
+        accessModes: ["ReadWriteOnce"]
+        resources:
+          requests:
+            storage: 64Mi
+
+  templates:
+    - name: main
+      dag:
+        tasks:
+          - name: test
+            template: test
+    - name: test
+      script:
+        image: alpine
+        command: [sh]
+        source: |
+          echo 1
+        volumeMounts:
+          - mountPath: /work
+            name: work
+        workingDir: /work
\ No newline at end of file
diff --git a/cmd/root_test.go b/cmd/root_test.go
new file mode 100644
index 0000000..9bcb695
--- /dev/null
+++ b/cmd/root_test.go
@@ -0,0 +1,11 @@
+package cmd
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestCmdMeta(t *testing.T) {
+	command := NewRoot()
+	assert.Equal(t, "gaw", command.Use)
+}