add Clear method

MeilCli · May 6, 2017 · 20e2233 · 20e2233
1 parent 3722dcc
commit 20e2233
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Showing 2 changed files with 26 additions and 0 deletions.
diff --git a/Source/Plugin.CrossFormattedText.Abstractions/FormattedStringBuilder.cs b/Source/Plugin.CrossFormattedText.Abstractions/FormattedStringBuilder.cs
@@ -200,6 +200,11 @@ public FormattedStringBuilder AppendLine(string value,Span span) {
             return this;
         }
 
+        public FormattedStringBuilder Clear() {
+            Length = 0;
+            return this;
+        }
+
         public FormattedString ToFormattedString() {
             return MergeCharSpan();
         }

diff --git a/Test/Test.CrossFormattedText.Unit/FormattedStringBuilderTest.cs b/Test/Test.CrossFormattedText.Unit/FormattedStringBuilderTest.cs
@@ -52,5 +52,26 @@ public void AppendLineTest() {
 
             Assert.AreEqual(fsb.ToFormattedString().Text,sb.ToString());
         }
+
+        [TestMethod]
+        public void ClearTest() {
+            var sb = new StringBuilder();
+            var fsb = new FormattedStringBuilder();
+
+            sb.AppendLine();
+            fsb.AppendLine();
+            sb.Append("aaa");
+            fsb.Append("aaa");
+            sb.Clear();
+            fsb.Clear();
+
+            Assert.AreEqual(fsb.Length,sb.Length);
+            Assert.AreEqual(fsb.ToFormattedString().Text,sb.ToString());
+
+            sb.Append("aaa");
+            fsb.Append("aaa");
+
+            Assert.AreEqual(fsb.ToFormattedString().Text,sb.ToString());
+        }
     }
 }