test: add unit tests for ListOfTopics method in canais module

Author: fabianoflorentino

internal/canais/topics_test.go

@@ -0,0 +1,87 @@
+package canais
+
+import (
+	"os"
+	"testing"
+
+	"github.com/fabianoflorentino/aprendago/pkg/topic"
+)
+
+func TestTopics(t *testing.T) {
+	os.Setenv("GOENV", "test")
+
+	tt := topic.New()
+
+	list := []string{
+		entendendoCanais,
+		canaisDirecionaisUtilizandoCanais,
+		rangeEClose,
+		selectStatement,
+		commaOkExpression,
+		convergencia,
+		divergencia,
+		context,
+	}
+
+	t.Run("TestRootDirValidation", func(t *testing.T) {
+		if rootDir != "internal/canais" {
+			t.Errorf("Expected rootDir to be 'internal/canais', got '%s'", rootDir)
+		}
+	})
+
+	t.Run("TestListOfTopicsWithValidInput", func(t *testing.T) {
+		expectedLength := 8
+		topics := tt.ListOfTopics(list, expectedLength)
+		if len(topics) != expectedLength {
+			t.Errorf("Expected %d topics, got %d", expectedLength, len(topics))
+		}
+
+		expectedTopics := []string{
+			entendendoCanais,
+			canaisDirecionaisUtilizandoCanais,
+			rangeEClose,
+			selectStatement,
+			commaOkExpression,
+			convergencia,
+			divergencia,
+			context,
+		}
+		for i, topic := range expectedTopics {
+			if topics[i] != topic {
+				t.Errorf("Expected topic at index %d to be %s, got %s", i, topic, topics[i])
+			}
+		}
+	})
+
+	t.Run("TestListOfTopicsWithLimitGreaterThanListSize", func(t *testing.T) {
+		limit := 10
+		topics := tt.ListOfTopics(list, limit)
+		if len(topics) != len(list) {
+			t.Errorf("Expected %d topics, got %d", len(list), len(topics))
+		}
+	})
+
+	t.Run("TestListOfTopicsWithZeroLimit", func(t *testing.T) {
+		limit := 0
+		topics := tt.ListOfTopics(list, limit)
+		if len(topics) != 0 {
+			t.Errorf("Expected 0 topics, got %d", len(topics))
+		}
+	})
+
+	t.Run("TestListOfTopicsWithNegativeLimit", func(t *testing.T) {
+		limit := -1
+		topics := tt.ListOfTopics(list, limit)
+		if len(topics) != 0 {
+			t.Errorf("Expected 0 topics for negative limit, got %d", len(topics))
+		}
+	})
+
+	t.Run("TestListOfTopicsWithEmptyList", func(t *testing.T) {
+		emptyList := []string{}
+		topics := tt.ListOfTopics(emptyList, 5)
+		if len(topics) != 0 {
+			t.Errorf("Expected 0 topics for empty list, got %d", len(topics))
+		}
+	})
+}