diff --git a/cmd/root_test.go b/cmd/root_test.go
index 3047559e..5546fc1d 100644
--- a/cmd/root_test.go
+++ b/cmd/root_test.go
@@ -5,22 +5,28 @@ import (
 
 	"github.com/stretchr/testify/assert"
 
-	exec "github.com/linuxsuren/go-fake-runtime"
+	fakeruntime "github.com/linuxsuren/go-fake-runtime"
 )
 
 func TestCreateRunCommand(t *testing.T) {
 	cmd := createRunCommand()
 	assert.Equal(t, "run", cmd.Use)
 
-	init := createInitCommand(exec.FakeExecer{})
+	init := createInitCommand(fakeruntime.FakeExecer{})
 	assert.Equal(t, "init", init.Use)
 
 	server := createServerCmd(&fakeGRPCServer{})
 	assert.NotNil(t, server)
 	assert.Equal(t, "server", server.Use)
 
-	root := NewRootCmd(exec.FakeExecer{}, NewFakeGRPCServer())
+	root := NewRootCmd(fakeruntime.FakeExecer{}, NewFakeGRPCServer())
 	root.SetArgs([]string{"init", "-k=demo.yaml", "--wait-namespace", "demo", "--wait-resource", "demo"})
 	err := root.Execute()
 	assert.Nil(t, err)
 }
+
+func TestRootCmd(t *testing.T) {
+	c := NewRootCmd(fakeruntime.FakeExecer{ExpectOS: "linux"}, NewFakeGRPCServer())
+	assert.NotNil(t, c)
+	assert.Equal(t, "atest", c.Use)
+}
diff --git a/cmd/run.go b/cmd/run.go
index 37c76d59..17d58337 100644
--- a/cmd/run.go
+++ b/cmd/run.go
@@ -5,8 +5,6 @@ import (
 	"fmt"
 	"io"
 	"os"
-	"path"
-	"path/filepath"
 	"strings"
 	"sync"
 	"time"
@@ -16,7 +14,6 @@ import (
 	"github.com/linuxsuren/api-testing/pkg/render"
 	"github.com/linuxsuren/api-testing/pkg/runner"
 	"github.com/linuxsuren/api-testing/pkg/testing"
-	"github.com/linuxsuren/api-testing/pkg/util"
 	"github.com/spf13/cobra"
 	"golang.org/x/sync/semaphore"
 )
@@ -40,12 +37,16 @@ type runOption struct {
 	swaggerURL         string
 	level              string
 	caseItems          []string
+
+	// for internal use
+	loader testing.Loader
 }
 
 func newDefaultRunOption() *runOption {
 	return &runOption{
 		reporter:     runner.NewMemoryTestReporter(),
 		reportWriter: runner.NewResultWriter(os.Stdout),
+		loader:       testing.NewFileLoader(),
 	}
 }
 
@@ -134,19 +135,13 @@ func (o *runOption) runE(cmd *cobra.Command, args []string) (err error) {
 		o.limiter.Stop()
 	}()
 
-	var suites []string
-	for _, pattern := range util.Expand(o.pattern) {
-		var files []string
-		if files, err = filepath.Glob(pattern); err == nil {
-			suites = append(suites, files...)
-		}
+	if err = o.loader.Put(o.pattern); err != nil {
+		return
 	}
 
-	cmd.Println("found suites:", len(suites))
-	for i := range suites {
-		item := suites[i]
-		cmd.Println("run suite:", item)
-		if err = o.runSuiteWithDuration(item); err != nil {
+	cmd.Println("found suites:", o.loader.GetCount())
+	for o.loader.HasMore() {
+		if err = o.runSuiteWithDuration(o.loader); err != nil {
 			break
 		}
 	}
@@ -166,7 +161,7 @@ func (o *runOption) runE(cmd *cobra.Command, args []string) (err error) {
 	return
 }
 
-func (o *runOption) runSuiteWithDuration(suite string) (err error) {
+func (o *runOption) runSuiteWithDuration(loader testing.Loader) (err error) {
 	sem := semaphore.NewWeighted(o.thread)
 	stop := false
 	var timeout *time.Ticker
@@ -204,7 +199,7 @@ func (o *runOption) runSuiteWithDuration(suite string) (err error) {
 				}()
 
 				dataContext := getDefaultContext()
-				ch <- o.runSuite(suite, dataContext, o.context, stopSingal)
+				ch <- o.runSuite(loader, dataContext, o.context, stopSingal)
 			}(errChannel, sem)
 			if o.duration <= 0 {
 				stop = true
@@ -221,9 +216,14 @@ func (o *runOption) runSuiteWithDuration(suite string) (err error) {
 	return
 }
 
-func (o *runOption) runSuite(suite string, dataContext map[string]interface{}, ctx context.Context, stopSingal chan struct{}) (err error) {
+func (o *runOption) runSuite(loader testing.Loader, dataContext map[string]interface{}, ctx context.Context, stopSingal chan struct{}) (err error) {
+	var data []byte
+	if data, err = loader.Load(); err != nil {
+		return
+	}
+
 	var testSuite *testing.TestSuite
-	if testSuite, err = testing.Parse(suite); err != nil {
+	if testSuite, err = testing.Parse(data); err != nil {
 		return
 	}
 
@@ -253,7 +253,7 @@ func (o *runOption) runSuite(suite string, dataContext map[string]interface{}, c
 			o.limiter.Accept()
 
 			ctxWithTimeout, _ := context.WithTimeout(ctx, o.requestTimeout)
-			ctxWithTimeout = context.WithValue(ctxWithTimeout, runner.ContextKey("").ParentDir(), path.Dir(suite))
+			ctxWithTimeout = context.WithValue(ctxWithTimeout, runner.ContextKey("").ParentDir(), loader.GetContext())
 
 			simpleRunner := runner.NewSimpleTestCaseRunner()
 			simpleRunner.WithTestReporter(o.reporter)
diff --git a/cmd/run_test.go b/cmd/run_test.go
index 4e0e0a64..e8ac5bdc 100644
--- a/cmd/run_test.go
+++ b/cmd/run_test.go
@@ -12,8 +12,8 @@ import (
 
 	"github.com/h2non/gock"
 	"github.com/linuxsuren/api-testing/pkg/limit"
+	atest "github.com/linuxsuren/api-testing/pkg/testing"
 	"github.com/linuxsuren/api-testing/pkg/util"
-	fakeruntime "github.com/linuxsuren/go-fake-runtime"
 	"github.com/spf13/cobra"
 	"github.com/stretchr/testify/assert"
 )
@@ -58,8 +58,13 @@ func TestRunSuite(t *testing.T) {
 			opt.limiter = limit.NewDefaultRateLimiter(0, 0)
 			stopSingal := make(chan struct{}, 1)
 
-			err := opt.runSuite(tt.suiteFile, ctx, context.TODO(), stopSingal)
-			assert.Equal(t, tt.hasError, err != nil, err)
+			loader := atest.NewFileLoader()
+			err := loader.Put(tt.suiteFile)
+			assert.NoError(t, err)
+			if loader.HasMore() {
+				err = opt.runSuite(loader, ctx, context.TODO(), stopSingal)
+				assert.Equal(t, tt.hasError, err != nil, err)
+			}
 		})
 	}
 }
@@ -128,6 +133,11 @@ func TestRunCommand(t *testing.T) {
 		prepare: fooPrepare,
 		args:    []string{"-p", simpleSuite, "--report", "md", "--report-file", path.Join(tmpFile.Name(), "fake")},
 		hasErr:  true,
+	}, {
+		name:    "malformed report file path",
+		prepare: fooPrepare,
+		args:    []string{"-p", "[]]$#%*^&()"},
+		hasErr:  true,
 	}}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -146,12 +156,6 @@ func TestRunCommand(t *testing.T) {
 	}
 }
 
-func TestRootCmd(t *testing.T) {
-	c := NewRootCmd(fakeruntime.FakeExecer{ExpectOS: "linux"}, NewFakeGRPCServer())
-	assert.NotNil(t, c)
-	assert.Equal(t, "atest", c.Use)
-}
-
 func TestPreRunE(t *testing.T) {
 	tests := []struct {
 		name   string
diff --git a/pkg/testing/loader.go b/pkg/testing/loader.go
new file mode 100644
index 00000000..a6140da8
--- /dev/null
+++ b/pkg/testing/loader.go
@@ -0,0 +1,10 @@
+package testing
+
+// Loader is an interface for test cases loader
+type Loader interface {
+	HasMore() bool
+	Load() ([]byte, error)
+	Put(string) (err error)
+	GetContext() string
+	GetCount() int
+}
diff --git a/pkg/testing/loader_file.go b/pkg/testing/loader_file.go
new file mode 100644
index 00000000..9fd77ba4
--- /dev/null
+++ b/pkg/testing/loader_file.go
@@ -0,0 +1,52 @@
+package testing
+
+import (
+	"os"
+	"path"
+	"path/filepath"
+
+	"github.com/linuxsuren/api-testing/pkg/util"
+)
+
+type fileLoader struct {
+	paths []string
+	index int
+}
+
+// NewFileLoader creates the instance of file loader
+func NewFileLoader() Loader {
+	return &fileLoader{index: -1}
+}
+
+// HasMore returns if there are more test cases
+func (l *fileLoader) HasMore() bool {
+	l.index++
+	return l.index < len(l.paths)
+}
+
+// Load returns the test case content
+func (l *fileLoader) Load() (data []byte, err error) {
+	data, err = os.ReadFile(l.paths[l.index])
+	return
+}
+
+// Put adds the test case path
+func (l *fileLoader) Put(item string) (err error) {
+	for _, pattern := range util.Expand(item) {
+		var files []string
+		if files, err = filepath.Glob(pattern); err == nil {
+			l.paths = append(l.paths, files...)
+		}
+	}
+	return
+}
+
+// GetContext returns the context of current test case
+func (l *fileLoader) GetContext() string {
+	return path.Dir(l.paths[l.index])
+}
+
+// GetCount returns the count of test cases
+func (l *fileLoader) GetCount() int {
+	return len(l.paths)
+}
diff --git a/pkg/testing/loader_file_test.go b/pkg/testing/loader_file_test.go
new file mode 100644
index 00000000..d3ac7f10
--- /dev/null
+++ b/pkg/testing/loader_file_test.go
@@ -0,0 +1,56 @@
+package testing_test
+
+import (
+	"testing"
+
+	atest "github.com/linuxsuren/api-testing/pkg/testing"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFileLoader(t *testing.T) {
+	tests := []struct {
+		name   string
+		items  []string
+		verify func(t *testing.T, loader atest.Loader)
+	}{{
+		name:  "empty",
+		items: []string{},
+		verify: func(t *testing.T, loader atest.Loader) {
+			assert.False(t, loader.HasMore())
+			assert.Empty(t, loader.GetCount())
+		},
+	}, {
+		name:   "brace expansion path",
+		items:  []string{"testdata/{invalid-,}testcase.yaml"},
+		verify: defaultVerify,
+	}, {
+		name:   "glob path",
+		items:  []string{"testdata/*testcase.yaml"},
+		verify: defaultVerify,
+	}}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			loader := atest.NewFileLoader()
+			for _, item := range tt.items {
+				loader.Put(item)
+			}
+			tt.verify(t, loader)
+		})
+	}
+}
+
+func defaultVerify(t *testing.T, loader atest.Loader) {
+	assert.True(t, loader.HasMore())
+	data, err := loader.Load()
+	assert.Nil(t, err)
+	assert.Equal(t, invalidTestCaseContent, string(data))
+	assert.Equal(t, "testdata", loader.GetContext())
+
+	assert.True(t, loader.HasMore())
+	data, err = loader.Load()
+	assert.Nil(t, err)
+	assert.Equal(t, testCaseContent, string(data))
+	assert.Equal(t, "testdata", loader.GetContext())
+
+	assert.False(t, loader.HasMore())
+}
diff --git a/pkg/testing/parser.go b/pkg/testing/parser.go
index ffc9936f..14f13259 100644
--- a/pkg/testing/parser.go
+++ b/pkg/testing/parser.go
@@ -19,11 +19,8 @@ import (
 )
 
 // Parse parses a file and returns the test suite
-func Parse(configFile string) (testSuite *TestSuite, err error) {
-	var data []byte
-	if data, err = os.ReadFile(configFile); err == nil {
-		testSuite, err = ParseFromData(data)
-	}
+func Parse(data []byte) (testSuite *TestSuite, err error) {
+	testSuite, err = ParseFromData(data)
 
 	// schema validation
 	if err == nil {
@@ -116,7 +113,7 @@ func (r *Request) Render(ctx interface{}, dataDir string) (err error) {
 	}
 
 	// setting default values
-	r.Method = emptyThenDefault(r.Method, http.MethodGet)
+	r.Method = EmptyThenDefault(r.Method, http.MethodGet)
 	return
 }
 
@@ -153,18 +150,20 @@ func (r *Request) GetBody() (reader io.Reader, err error) {
 
 // Render renders the response
 func (r *Response) Render(ctx interface{}) (err error) {
-	r.StatusCode = zeroThenDefault(r.StatusCode, http.StatusOK)
+	r.StatusCode = ZeroThenDefault(r.StatusCode, http.StatusOK)
 	return
 }
 
-func zeroThenDefault(val, defVal int) int {
+// ZeroThenDefault return the default value if the val is zero
+func ZeroThenDefault(val, defVal int) int {
 	if val == 0 {
 		val = defVal
 	}
 	return val
 }
 
-func emptyThenDefault(val, defVal string) string {
+// EmptyThenDefault return the default value if the val is empty
+func EmptyThenDefault(val, defVal string) string {
 	if strings.TrimSpace(val) == "" {
 		val = defVal
 	}
diff --git a/pkg/testing/parser_test.go b/pkg/testing/parser_test.go
index b2d56635..84b4d3e9 100644
--- a/pkg/testing/parser_test.go
+++ b/pkg/testing/parser_test.go
@@ -1,150 +1,162 @@
-package testing
+package testing_test
 
 import (
 	"io"
 	"net/http"
+	"os"
 	"testing"
 
 	_ "embed"
 
+	atest "github.com/linuxsuren/api-testing/pkg/testing"
 	"github.com/linuxsuren/api-testing/pkg/util"
 	"github.com/stretchr/testify/assert"
 )
 
 func TestParse(t *testing.T) {
-	suite, err := Parse("../../sample/testsuite-gitlab.yaml")
+	data, err := os.ReadFile("../../sample/testsuite-gitlab.yaml")
+	if !assert.NoError(t, err) {
+		return
+	}
+
+	suite, err := atest.Parse(data)
 	if assert.Nil(t, err) && assert.NotNil(t, suite) {
 		assert.Equal(t, "Gitlab", suite.Name)
 		assert.Equal(t, 2, len(suite.Items))
-		assert.Equal(t, TestCase{
+		assert.Equal(t, atest.TestCase{
 			Name: "projects",
-			Request: Request{
+			Request: atest.Request{
 				API: "https://gitlab.com/api/v4/projects",
 			},
-			Expect: Response{
+			Expect: atest.Response{
 				StatusCode: http.StatusOK,
 				Schema: `{
   "type": "array"
 }
 `,
 			},
-			Before: Job{
+			Before: atest.Job{
 				Items: []string{"sleep(1)"},
 			},
-			After: Job{
+			After: atest.Job{
 				Items: []string{"sleep(1)"},
 			},
 		}, suite.Items[0])
 	}
 
-	_, err = Parse("testdata/invalid-testcase.yaml")
+	_, err = atest.Parse([]byte(invalidTestCaseContent))
 	assert.NotNil(t, err)
 }
 
 func TestDuplicatedNames(t *testing.T) {
-	_, err := Parse("testdata/duplicated-names.yaml")
+	data, err := os.ReadFile("testdata/duplicated-names.yaml")
+	if !assert.NoError(t, err) {
+		return
+	}
+
+	_, err = atest.Parse(data)
 	assert.NotNil(t, err)
 
-	_, err = ParseFromData([]byte("fake"))
+	_, err = atest.ParseFromData([]byte("fake"))
 	assert.NotNil(t, err)
 }
 
 func TestRequestRender(t *testing.T) {
 	tests := []struct {
 		name    string
-		request *Request
-		verify  func(t *testing.T, req *Request)
+		request *atest.Request
+		verify  func(t *testing.T, req *atest.Request)
 		ctx     interface{}
 		hasErr  bool
 	}{{
 		name: "slice as context",
-		request: &Request{
+		request: &atest.Request{
 			API:  "http://localhost/{{index . 0}}",
 			Body: "{{index . 1}}",
 		},
 		ctx:    []string{"foo", "bar"},
 		hasErr: false,
-		verify: func(t *testing.T, req *Request) {
+		verify: func(t *testing.T, req *atest.Request) {
 			assert.Equal(t, "http://localhost/foo", req.API)
 			assert.Equal(t, "bar", req.Body)
 		},
 	}, {
 		name:    "default values",
-		request: &Request{},
-		verify: func(t *testing.T, req *Request) {
+		request: &atest.Request{},
+		verify: func(t *testing.T, req *atest.Request) {
 			assert.Equal(t, http.MethodGet, req.Method)
 		},
 		hasErr: false,
 	}, {
 		name:    "context is nil",
-		request: &Request{},
+		request: &atest.Request{},
 		ctx:     nil,
 		hasErr:  false,
 	}, {
 		name: "body from file",
-		request: &Request{
+		request: &atest.Request{
 			BodyFromFile: "testdata/generic_body.json",
 		},
-		ctx: TestCase{
+		ctx: atest.TestCase{
 			Name: "linuxsuren",
 		},
 		hasErr: false,
-		verify: func(t *testing.T, req *Request) {
+		verify: func(t *testing.T, req *atest.Request) {
 			assert.Equal(t, `{"name": "linuxsuren"}`, req.Body)
 		},
 	}, {
 		name: "body file not found",
-		request: &Request{
+		request: &atest.Request{
 			BodyFromFile: "testdata/fake",
 		},
 		hasErr: true,
 	}, {
 		name: "invalid API as template",
-		request: &Request{
+		request: &atest.Request{
 			API: "{{.name}",
 		},
 		hasErr: true,
 	}, {
 		name: "failed with API render",
-		request: &Request{
+		request: &atest.Request{
 			API: "{{.name}}",
 		},
-		ctx:    TestCase{},
+		ctx:    atest.TestCase{},
 		hasErr: true,
 	}, {
 		name: "invalid body as template",
-		request: &Request{
+		request: &atest.Request{
 			Body: "{{.name}",
 		},
 		hasErr: true,
 	}, {
 		name: "failed with body render",
-		request: &Request{
+		request: &atest.Request{
 			Body: "{{.name}}",
 		},
-		ctx:    TestCase{},
+		ctx:    atest.TestCase{},
 		hasErr: true,
 	}, {
 		name: "form render",
-		request: &Request{
+		request: &atest.Request{
 			Form: map[string]string{
 				"key": "{{.Name}}",
 			},
 		},
-		ctx: TestCase{Name: "linuxsuren"},
-		verify: func(t *testing.T, req *Request) {
+		ctx: atest.TestCase{Name: "linuxsuren"},
+		verify: func(t *testing.T, req *atest.Request) {
 			assert.Equal(t, "linuxsuren", req.Form["key"])
 		},
 		hasErr: false,
 	}, {
 		name: "header render",
-		request: &Request{
+		request: &atest.Request{
 			Header: map[string]string{
 				"key": "{{.Name}}",
 			},
 		},
-		ctx: TestCase{Name: "linuxsuren"},
-		verify: func(t *testing.T, req *Request) {
+		ctx: atest.TestCase{Name: "linuxsuren"},
+		verify: func(t *testing.T, req *atest.Request) {
 			assert.Equal(t, "linuxsuren", req.Header["key"])
 		},
 		hasErr: false,
@@ -162,14 +174,14 @@ func TestRequestRender(t *testing.T) {
 func TestResponseRender(t *testing.T) {
 	tests := []struct {
 		name     string
-		response *Response
-		verify   func(t *testing.T, req *Response)
+		response *atest.Response
+		verify   func(t *testing.T, req *atest.Response)
 		ctx      interface{}
 		hasErr   bool
 	}{{
 		name:     "blank response",
-		response: &Response{},
-		verify: func(t *testing.T, req *Response) {
+		response: &atest.Response{},
+		verify: func(t *testing.T, req *atest.Response) {
 			assert.Equal(t, http.StatusOK, req.StatusCode)
 		},
 		hasErr: false,
@@ -208,24 +220,24 @@ func TestEmptyThenDefault(t *testing.T) {
 	}}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			result := emptyThenDefault(tt.val, tt.defVal)
+			result := atest.EmptyThenDefault(tt.val, tt.defVal)
 			assert.Equal(t, tt.expect, result, result)
 		})
 	}
 
-	assert.Equal(t, 1, zeroThenDefault(0, 1))
-	assert.Equal(t, 1, zeroThenDefault(1, 2))
+	assert.Equal(t, 1, atest.ZeroThenDefault(0, 1))
+	assert.Equal(t, 1, atest.ZeroThenDefault(1, 2))
 }
 
 func TestTestCase(t *testing.T) {
-	testCase, err := ParseTestCaseFromData([]byte(testCaseContent))
+	testCase, err := atest.ParseTestCaseFromData([]byte(testCaseContent))
 	assert.Nil(t, err)
-	assert.Equal(t, &TestCase{
+	assert.Equal(t, &atest.TestCase{
 		Name: "projects",
-		Request: Request{
+		Request: atest.Request{
 			API: "https://foo",
 		},
-		Expect: Response{
+		Expect: atest.Response{
 			StatusCode: http.StatusOK,
 		},
 	}, testCase)
@@ -236,21 +248,21 @@ func TestGetBody(t *testing.T) {
 
 	tests := []struct {
 		name        string
-		req         *Request
+		req         *atest.Request
 		expectBody  string
 		containBody string
 		expectErr   bool
 	}{{
 		name:       "normal body",
-		req:        &Request{Body: defaultBody},
+		req:        &atest.Request{Body: defaultBody},
 		expectBody: defaultBody,
 	}, {
 		name:       "body from file",
-		req:        &Request{BodyFromFile: "testdata/testcase.yaml"},
+		req:        &atest.Request{BodyFromFile: "testdata/testcase.yaml"},
 		expectBody: testCaseContent,
 	}, {
 		name: "multipart form data",
-		req: &Request{
+		req: &atest.Request{
 			Header: map[string]string{
 				util.ContentType: util.MultiPartFormData,
 			},
@@ -261,7 +273,7 @@ func TestGetBody(t *testing.T) {
 		containBody: "name=\"key\"\r\n\r\nvalue\r\n",
 	}, {
 		name: "normal form",
-		req: &Request{
+		req: &atest.Request{
 			Header: map[string]string{
 				util.ContentType: util.Form,
 			},
@@ -292,3 +304,6 @@ func TestGetBody(t *testing.T) {
 
 //go:embed testdata/testcase.yaml
 var testCaseContent string
+
+//go:embed testdata/invalid-testcase.yaml
+var invalidTestCaseContent string