tests for stringbuilder, updated changelog

Author: Sven Ulrich

CHANGELOG.md

@@ -3,4 +3,4 @@
 #### 1.4.0
 - added `AppendLine` and `AppendLineFormat`
 - added hexadecimal conversion specifier
-- bugfix `StringBuilder` initialization without parameter adds empty string.
+- bugfix `StringBuilder` initialization without parameter adds empty string to internal Values Array.

dist/index.ts

@@ -259,10 +259,14 @@ export class String {
 }
 
 export class StringBuilder {
-    public Values: string[] = [];
+    public Values: string[];
 
-    constructor(value: string = String.Empty) {
-        this.Values = new Array(value);
+    constructor(value?: string) {
+        this.Values = [];
+
+        if (!String.IsNullOrWhiteSpace(value)) {
+            this.Values = new Array(value);
+        }
     }
 
     public ToString() {

tests/tests.ts

@@ -269,7 +269,27 @@ describe('String.Join', () => {
     });
 });
 
-describe('String.Append', () => {
+describe('StringBuilder initialization', () => {
+    it('should not add empty string if there is no ctor parameter', () => {
+        var builder = new StringBuilder();
+        builder.Append('First Part... ');
+        builder.Append('Second Part...');
+
+        expect(builder.ToString()).to
+        .equal('First Part... Second Part...');
+    });
+
+    it('should add a string if there is ctor parameter', () => {
+        var builder = new StringBuilder(String.Format("First {0}... ", "Part"));
+        builder.AppendFormat('Second {0}...', 'Part');
+
+        console.log(builder.ToString());
+        expect(builder.ToString()).to
+        .equal('First Part... Second Part...');
+    });
+});
+
+describe('StringBuilderng.Append', () => {
     it('should append characters', () => {
         var builder = new StringBuilder();
         builder.Append('First Part... ');
@@ -290,7 +310,7 @@ describe('String.Append', () => {
     });
 });
 
-describe('String.AppendLine', () => {
+describe('StringBuilder.AppendLine', () => {
     it('should append characters and new line', () => {
         var builder = new StringBuilder();
         builder.AppendLine('First Line...');