added another mock SCM implementation.

I should probably move mocks to its own package for better discoverability.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@13170 71c3de6d-444a-0410-be80-ed276b4c234a

test/src/main/java/org/jvnet/hudson/test/SingleFileSCM.java

+package org.jvnet.hudson.test;
+
+import hudson.scm.NullSCM;
+import hudson.scm.SCM;
+import hudson.model.AbstractBuild;
+import hudson.model.BuildListener;
+import hudson.Launcher;
+import hudson.FilePath;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.charset.Charset;
+
+import org.apache.commons.io.IOUtils;
+
+/**
+ * {@link SCM} useful for testing that puts just one file in the workspace.
+ *
+ * @author Kohsuke Kawaguchi
+ */
+public class SingleFileSCM extends NullSCM {
+    private final String path;
+    private final byte[] contents;
+
+    public SingleFileSCM(String path, byte[] contents) {
+        this.path = path;
+        this.contents = contents;
+    }
+
+    public SingleFileSCM(String path, String contents) {
+        this.path = path;
+        this.contents = contents.getBytes(Charset.forName("UTF-8"));
+    }
+
+    @Override
+    public boolean checkout(AbstractBuild build, Launcher launcher, FilePath workspace, BuildListener listener, File changeLogFile) throws IOException, InterruptedException {
+        listener.getLogger().println("Staging "+path);
+        OutputStream os = workspace.child(path).write();
+        IOUtils.write(contents, os);
+        os.close();
+        return true;
+    }
+}