diff --git a/internal/client/params_test.go b/internal/client/params_test.go
new file mode 100644
index 0000000..d7cb914
--- /dev/null
+++ b/internal/client/params_test.go
@@ -0,0 +1,94 @@
+package client
+
+import (
+	"io"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNewMockParams_CreatesValidInstance(t *testing.T) {
+	params := NewMockParams()
+	require.NotNil(t, params, "params must not be nil")
+}
+
+func TestNewMockParams_SetsMockProvider(t *testing.T) {
+	params := NewMockParams()
+	assert.Equal(t, "mock", params.Provider, "provider must be mock")
+}
+
+func TestNewMockParams_SetsDefaultToken(t *testing.T) {
+	params := NewMockParams()
+	assert.Equal(t, "ABC", params.Token, "token must be ABC")
+}
+
+func TestNewMockParams_EnablesMockProject(t *testing.T) {
+	params := NewMockParams()
+	assert.True(t, params.MockProject, "mock project must be enabled")
+}
+
+func TestNewMockParams_DisablesDebug(t *testing.T) {
+	params := NewMockParams()
+	assert.False(t, params.Debug, "debug must be disabled")
+}
+
+func TestNewMockParams_DisablesStats(t *testing.T) {
+	assert.False(t, NewMockParams().Stats, "stats must be disabled")
+}
+
+func TestNewMockParams_SetsStdFormat(t *testing.T) {
+	params := NewMockParams()
+	assert.Equal(t, "std", params.Format, "format must be std")
+}
+
+func TestNewMockParams_SetsDefaultMaxSize(t *testing.T) {
+	params := NewMockParams()
+	assert.Equal(t, 200, params.MaxSize, "max size must be 200")
+}
+
+func TestNewMockParams_SetsDiscardLog(t *testing.T) {
+	params := NewMockParams()
+	assert.Equal(t, io.Discard, params.Log, "log must be io.Discard")
+}
+
+func TestNewMockParams_SetsDefaultChecks(t *testing.T) {
+	params := NewMockParams()
+	require.Equal(t, 1, len(params.Checks), "must have one check")
+	assert.Equal(t, "mvn clean test", params.Checks[0], "check must be mvn clean test")
+}
+
+func TestNewMockParams_DisablesColorless(t *testing.T) {
+	params := NewMockParams()
+	assert.False(t, params.Colorless, "colorless must be disabled")
+}
+
+func TestNewMockParams_SetsDefaultModel(t *testing.T) {
+	params := NewMockParams()
+	assert.Equal(t, "gpt-3.5-turbo", params.Model, "model must be gpt-3.5-turbo")
+}
+
+func TestNewMockParams_SetsDefaultAttempts(t *testing.T) {
+	params := NewMockParams()
+	assert.Equal(t, 3, params.Attempts, "attempts must be 3")
+}
+
+func TestNewMockParams_SetsEmptyPlaybook(t *testing.T) {
+	params := NewMockParams()
+	assert.Equal(t, "", params.Playbook, "playbook must be empty")
+}
+
+func TestNewMockParams_SetsStatsOutput(t *testing.T) {
+	params := NewMockParams()
+	assert.Equal(t, "stats", params.Soutput, "soutput must be stats")
+}
+
+func TestNewMockParams_SetsEmptyInput(t *testing.T) {
+	params := NewMockParams()
+	assert.Equal(t, "", params.Input, "input must be empty")
+}
+
+func TestNewMockParams_SetsEmptyOutput(t *testing.T) {
+	params := NewMockParams()
+	assert.Equal(t, "", params.Output, "output must be empty")
+}