Test System Rules on Windows.

System Rules uses system dependent code that can behave different on
different OS.

README.md

@@ -1,6 +1,6 @@
 # System Rules
 
-[![Build Status](https://travis-ci.org/stefanbirkner/system-rules.svg?branch=master)](https://travis-ci.org/stefanbirkner/system-rules)
+[![Build Status Linux](https://travis-ci.org/stefanbirkner/system-rules.svg?branch=master)](https://travis-ci.org/stefanbirkner/system-rules) [![Build Status Windows](https://ci.appveyor.com/api/projects/status/vr0c93rssc6mhetl/branch/master?svg=true)](https://ci.appveyor.com/project/stefanbirkner/system-rules)
 
 System Rules is a collection of JUnit rules for testing code which uses
 `java.lang.System`.
@@ -50,9 +50,10 @@ want to contribute code than
 The basic coding style is described in the
 [EditorConfig](http://editorconfig.org/) file `.editorconfig`.
 
-System Rules supports [Travis CI](https://travis-ci.org/) for continuous
-integration. Your pull request will be automatically build by Travis
-CI.
+System Rules supports [Travis CI](https://travis-ci.org/) (Linux) and
+[AppVeyor](http://www.appveyor.com/) (Windows) for continuous
+integration. Your pull request will be automatically build by both CI
+servers.
 
 
 ## Release Guide

appveyor.yml

@@ -0,0 +1,20 @@
+version: '{build}'
+os: Windows Server 2012
+install:
+  - ps: |
+      Add-Type -AssemblyName System.IO.Compression.FileSystem
+      if (!(Test-Path -Path "C:\maven" )) {
+        (new-object System.Net.WebClient).DownloadFile(
+          'http://www.us.apache.org/dist/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.zip',
+          'C:\maven-bin.zip'
+        )
+        [System.IO.Compression.ZipFile]::ExtractToDirectory("C:\maven-bin.zip", "C:\maven")
+      }
+  - cmd: SET PATH=C:\maven\apache-maven-3.3.9\bin;%JAVA_HOME%\bin;%PATH%
+build_script:
+  - mvn clean package -DskipTest -Dgpg.skip
+test_script:
+  - mvn clean verify -Dgpg.skip
+cache:
+  - C:\maven\
+  - C:\Users\appveyor\.m2

pom.xml

@@ -9,7 +9,7 @@
 	</parent>
 
 	<artifactId>system-rules</artifactId>
-	<version>1.15.0</version>
+	<version>1.16.0-SNAPSHOT</version>
 	<packaging>jar</packaging>
 
 	<name>System Rules</name>

src/test/java/org/junit/contrib/java/lang/system/DisallowWriteToSystemErrTest.java

@@ -8,6 +8,7 @@
 import java.util.Locale;
 
 import static java.lang.System.err;
+import static java.lang.System.getProperty;
 import static java.lang.System.setErr;
 import static java.util.Locale.CANADA;
 import static org.assertj.core.api.Assertions.assertThat;
@@ -268,7 +269,9 @@ public void evaluate() throws Throwable {
 		}, disallowWrite);
 		assertThat(error)
 			.isInstanceOf(AssertionError.class)
-			.hasMessage("Tried to write '\n' although this is not allowed.");
+			.hasMessage("Tried to write '"
+				+ getProperty("line.separator").substring(0, 1)
+				+ "' although this is not allowed.");
 	}
 
 	@Test

src/test/java/org/junit/contrib/java/lang/system/DisallowWriteToSystemOutTest.java

@@ -7,6 +7,7 @@
 import java.io.PrintStream;
 import java.util.Locale;
 
+import static java.lang.System.getProperty;
 import static java.lang.System.out;
 import static java.lang.System.setOut;
 import static java.util.Locale.CANADA;
@@ -268,7 +269,9 @@ public void evaluate() throws Throwable {
 		}, disallowWrite);
 		assertThat(error)
 			.isInstanceOf(AssertionError.class)
-			.hasMessage("Tried to write '\n' although this is not allowed.");
+			.hasMessage("Tried to write '"
+				+ getProperty("line.separator").substring(0, 1)
+				+ "' although this is not allowed.");
 	}
 
 	@Test