test(slug): add unit tests for slug behavior

session/slug/slug_test.go

@@ -0,0 +1,104 @@
+package slug
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/suite"
+)
+
+type SlugTestSuite struct {
+	suite.Suite
+	slug Slug
+}
+
+func (suite *SlugTestSuite) SetupTest() {
+	suite.slug = New()
+}
+
+func TestNew(t *testing.T) {
+	s := New()
+
+	assert.NotNil(t, s, "New() should return a non-nil Slug")
+	assert.Implements(t, (*Slug)(nil), s, "New() should return a type that implements Slug interface")
+	assert.Equal(t, "", s.String(), "New() should initialize with empty string")
+}
+
+func (suite *SlugTestSuite) TestString() {
+	assert.Equal(suite.T(), "", suite.slug.String(), "String() should return empty string initially")
+
+	suite.slug.Set("test-slug")
+	assert.Equal(suite.T(), "test-slug", suite.slug.String(), "String() should return the set value")
+}
+
+func (suite *SlugTestSuite) TestSet() {
+	testCases := []struct {
+		name     string
+		input    string
+		expected string
+	}{
+		{
+			name:     "simple slug",
+			input:    "hello-world",
+			expected: "hello-world",
+		},
+		{
+			name:     "empty string",
+			input:    "",
+			expected: "",
+		},
+		{
+			name:     "slug with numbers",
+			input:    "test-123",
+			expected: "test-123",
+		},
+		{
+			name:     "slug with special characters",
+			input:    "hello_world-123",
+			expected: "hello_world-123",
+		},
+		{
+			name:     "overwrite existing slug",
+			input:    "new-slug",
+			expected: "new-slug",
+		},
+	}
+
+	for _, tc := range testCases {
+		suite.Run(tc.name, func() {
+			suite.slug.Set(tc.input)
+			assert.Equal(suite.T(), tc.expected, suite.slug.String())
+		})
+	}
+}
+
+func (suite *SlugTestSuite) TestMultipleSet() {
+	suite.slug.Set("first-slug")
+	assert.Equal(suite.T(), "first-slug", suite.slug.String())
+
+	suite.slug.Set("second-slug")
+	assert.Equal(suite.T(), "second-slug", suite.slug.String())
+
+	suite.slug.Set("")
+	assert.Equal(suite.T(), "", suite.slug.String())
+}
+
+func TestSlugInterface(t *testing.T) {
+	var _ Slug = (*slug)(nil)
+	var _ Slug = New()
+}
+
+func TestSlugIsolation(t *testing.T) {
+	slug1 := New()
+	slug2 := New()
+
+	slug1.Set("slug-one")
+	slug2.Set("slug-two")
+
+	assert.Equal(t, "slug-one", slug1.String(), "First slug should maintain its value")
+	assert.Equal(t, "slug-two", slug2.String(), "Second slug should maintain its value")
+}
+
+func TestSlugTestSuite(t *testing.T) {
+	suite.Run(t, new(SlugTestSuite))
+}