Updated FileWrapper async calls to allow errors to bubble up. (#492)

Fixes #491

Author: JerrettDavis

System.IO.Abstractions/FileWrapper.cs

@@ -30,14 +30,12 @@ public override void AppendAllLines(string path, IEnumerable<string> contents, E
 #if NETCOREAPP2_0
         public override Task AppendAllLinesAsync(string path, IEnumerable<string> contents, CancellationToken cancellationToken)
         {
-            File.AppendAllLinesAsync(path, contents, cancellationToken);
-            return Task.CompletedTask;
+            return File.AppendAllLinesAsync(path, contents, cancellationToken);
         }
 
         public override Task AppendAllLinesAsync(string path, IEnumerable<string> contents, Encoding encoding, CancellationToken cancellationToken)
         {
-            File.AppendAllLinesAsync(path, contents, encoding, cancellationToken);
-            return Task.CompletedTask;
+            return File.AppendAllLinesAsync(path, contents, encoding, cancellationToken);
         }
 #endif
 
@@ -54,14 +52,12 @@ public override void AppendAllText(string path, string contents, Encoding encodi
 #if NETCOREAPP2_0
         public override Task AppendAllTextAsync(string path, string contents, CancellationToken cancellationToken)
         {
-            File.AppendAllTextAsync(path, contents, cancellationToken);
-            return Task.CompletedTask;
+            return File.AppendAllTextAsync(path, contents, cancellationToken);
         }
 
         public override Task AppendAllTextAsync(string path, string contents, Encoding encoding, CancellationToken cancellationToken)
         {
-            File.AppendAllTextAsync(path, contents, encoding, cancellationToken);
-            return Task.CompletedTask;
+            return File.AppendAllTextAsync(path, contents, encoding, cancellationToken);
         }
 #endif
 
@@ -378,8 +374,7 @@ public override void WriteAllBytes(string path, byte[] bytes)
 #if NETCOREAPP2_0
         public override Task WriteAllBytesAsync(string path, byte[] bytes, CancellationToken cancellationToken)
         {
-            File.WriteAllBytesAsync(path, bytes, cancellationToken);
-            return Task.CompletedTask;
+            return File.WriteAllBytesAsync(path, bytes, cancellationToken);
         }
 #endif
 
@@ -553,26 +548,22 @@ public override void WriteAllLines(string path, string[] contents, Encoding enco
 #if NETCOREAPP2_0
         public override Task WriteAllLinesAsync(string path, IEnumerable<string> contents, CancellationToken cancellationToken)
         {
-            File.WriteAllLinesAsync(path, contents, cancellationToken);
-            return Task.CompletedTask;
+            return File.WriteAllLinesAsync(path, contents, cancellationToken);
         }
 
         public override Task WriteAllLinesAsync(string path, IEnumerable<string> contents, Encoding encoding, CancellationToken cancellationToken)
         {
-            File.WriteAllLinesAsync(path, contents, encoding, cancellationToken);
-            return Task.CompletedTask;
+            return File.WriteAllLinesAsync(path, contents, encoding, cancellationToken);
         }
 
         public override Task WriteAllLinesAsync(string path, string[] contents, CancellationToken cancellationToken)
         {
-            File.WriteAllLinesAsync(path, contents, cancellationToken);
-            return Task.CompletedTask;
+            return File.WriteAllLinesAsync(path, contents, cancellationToken);
         }
 
         public override Task WriteAllLinesAsync(string path, string[] contents, Encoding encoding, CancellationToken cancellationToken)
         {
-            File.WriteAllLinesAsync(path, contents, encoding, cancellationToken);
-            return Task.CompletedTask;
+            return File.WriteAllLinesAsync(path, contents, encoding, cancellationToken);
         }
 #endif
 
@@ -651,14 +642,12 @@ public override void WriteAllText(string path, string contents, Encoding encodin
 #if NETCOREAPP2_0
         public override Task WriteAllTextAsync(string path, string contents, CancellationToken cancellationToken)
         {
-            File.WriteAllTextAsync(path, contents, cancellationToken);
-            return Task.CompletedTask;
+            return File.WriteAllTextAsync(path, contents, cancellationToken);
         }
 
         public override Task WriteAllTextAsync(string path, string contents, Encoding encoding, CancellationToken cancellationToken)
         {
-            File.WriteAllTextAsync(path, contents, encoding, cancellationToken);
-            return Task.CompletedTask;
+            return File.WriteAllTextAsync(path, contents, encoding, cancellationToken);
         }
 #endif
     }