diff --git a/pkg/cli/cli_test.go b/pkg/cli/cli_test.go
index 9e24285..66ebcb1 100644
--- a/pkg/cli/cli_test.go
+++ b/pkg/cli/cli_test.go
@@ -1,7 +1,10 @@
 package cli_test
 
 import (
+	"encoding/json"
 	"fmt"
+	"github.com/semaphoreci/test-results/pkg/parser"
+	"github.com/stretchr/testify/require"
 	"os"
 	"testing"
 
@@ -40,6 +43,18 @@ func Test_LoadFiles(t *testing.T) {
 
 		os.RemoveAll(dirPath)
 	})
+
+	t.Run("with big directory", func(t *testing.T) {
+		dirPath := generateDirWithFilesAndNestedDir(t, 2600, 3)
+		assert.NotEmpty(t, dirPath)
+
+		paths, err := cli.LoadFiles([]string{dirPath}, ".xml")
+		assert.Len(t, paths, 2600, "should return correct number of files")
+		assert.Nil(t, err, "should not throw error")
+
+		os.RemoveAll(dirPath)
+	})
+
 }
 
 func generateFile(t *testing.T) string {
@@ -52,22 +67,116 @@ func generateFile(t *testing.T) string {
 }
 
 func generateDir(t *testing.T) string {
+	return generateDirWithFilesAndNestedDir(t, 5, 3)
+}
+
+func generateDirWithFilesAndNestedDir(t *testing.T, fNumber, dirNumber int) string {
 	dirPath, err := os.MkdirTemp("", "")
 	assert.Nil(t, err)
 
 	nestedDir, err := os.MkdirTemp(dirPath, "xml-*")
 	assert.Nil(t, err)
 
-	for i := 0; i < 5; i++ {
+	for i := 0; i < fNumber; i++ {
 		_, err = os.CreateTemp(nestedDir, "file-*.xml")
 		assert.Nil(t, err)
 	}
 
 	nestedDir, _ = os.MkdirTemp(dirPath, "json-*")
-	for i := 0; i < 3; i++ {
+	for i := 0; i < dirNumber; i++ {
 		_, err := os.MkdirTemp(nestedDir, "file-*.json")
 		assert.Nil(t, err)
 	}
 
 	return dirPath
 }
+
+func TestWriteToTmpFile(t *testing.T) {
+	tr := parser.TestResults{
+		ID:         "1234",
+		Name:       "Test",
+		Framework:  "JUnit",
+		IsDisabled: false,
+		Suites:     nil,
+		Summary: parser.Summary{
+			Total:    10,
+			Passed:   5,
+			Skipped:  0,
+			Error:    0,
+			Failed:   5,
+			Disabled: 0,
+			Duration: 360,
+		},
+		Status:        "OK",
+		StatusMessage: "Test",
+	}
+	result := parser.Result{TestResults: []parser.TestResults{tr}}
+	jsonData, _ := json.Marshal(&result)
+
+	t.Run("Write to one tmp file", func(t *testing.T) {
+		file, err := cli.WriteToTmpFile(jsonData)
+		assert.NoError(t, err)
+		os.Remove(file)
+	})
+
+	t.Run("Write to three thousand tmp files", func(t *testing.T) {
+		fileNumber := 3000
+		files := make([]string, 0, fileNumber)
+
+		for i := 0; i < fileNumber; i++ {
+			file, err := cli.WriteToTmpFile(jsonData)
+			assert.NoError(t, err)
+
+			files = append(files, file)
+		}
+
+		for _, file := range files {
+			os.Remove(file)
+		}
+	})
+}
+
+func TestWriteToFile(t *testing.T) {
+	tr := parser.TestResults{
+		ID:         "1234",
+		Name:       "Test",
+		Framework:  "JUnit",
+		IsDisabled: false,
+		Suites:     nil,
+		Summary: parser.Summary{
+			Total:    10,
+			Passed:   5,
+			Skipped:  0,
+			Error:    0,
+			Failed:   5,
+			Disabled: 0,
+			Duration: 360,
+		},
+		Status:        "OK",
+		StatusMessage: "Test",
+	}
+	result := parser.Result{TestResults: []parser.TestResults{tr}}
+	jsonData, _ := json.Marshal(&result)
+
+	t.Run("Write to one file", func(t *testing.T) {
+		file, err := cli.WriteToFile(jsonData, "out")
+		assert.NoError(t, err)
+		os.Remove(file)
+	})
+
+	t.Run("Write to three thousand files", func(t *testing.T) {
+		fileNumber := 3000
+		dirPath, err := os.MkdirTemp("", "test-results-*")
+		require.NoError(t, err)
+
+		defer os.RemoveAll(dirPath)
+
+		for i := 0; i < fileNumber; i++ {
+			tmpFile, err := os.CreateTemp(dirPath, "result-*.json")
+			require.NoError(t, err)
+
+			_, err = cli.WriteToFile(jsonData, tmpFile.Name())
+			require.NoError(t, err)
+		}
+	})
+}