added test for text view split line

widgets/view.go

@@ -93,14 +93,17 @@ func (t *TextView) readInputLoop() {
 }
 
 func splitLine(line string, lineSize int) []string {
+	if line == "" {
+		return []string{}
+	}
+
 	var lines []string
 	for {
-		if len(line) < lineSize {
+		if len(line) <= lineSize {
 			lines = append(lines, line)
 			return lines
 		}
 		lines = append(lines, line[:lineSize])
 		line = line[lineSize:]
 	}
-	return lines
 }

widgets/view_test.go

@@ -0,0 +1,35 @@
+package widgets
+
+import "testing"
+
+func TestSplitEmptyLine(t *testing.T) {
+
+	result := splitLine("", 5)
+	if len(result) != 0 {
+		t.Errorf("expected: 0 lines, got: %d", len(result))
+	}
+}
+
+func TestSplitLineShorterThanLimit(t *testing.T) {
+
+	result := splitLine("hello", 7)
+	if len(result) != 1 {
+		t.Errorf("expected: 0 lines, got: %d", len(result))
+	}
+}
+
+func TestSplitLineLongerThanLimit(t *testing.T) {
+
+	result := splitLine("hello", 3)
+	if len(result) != 2 {
+		t.Errorf("expected: 0 lines, got: %d", len(result))
+	}
+}
+
+func TestSplitLineSameAsLimit(t *testing.T) {
+
+	result := splitLine("hello", 5)
+	if len(result) != 1 {
+		t.Errorf("expected: 0 lines, got: %d", len(result))
+	}
+}