[SCM-1024] maven-scm-plugin tests do not properly check for existence…

… of svn command

This closes #205

maven-scm-plugin/src/it/scm-741-validate-scm-url-matches-working-copy/selector.groovy

@@ -0,0 +1,26 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+try {
+    def proc = "svn".execute()
+    proc.consumeProcessOutput()
+    proc.waitFor()
+} catch (IOException e) {
+    return false
+}

maven-scm-plugin/src/it/scm-781/selector.groovy

@@ -0,0 +1,26 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+try {
+    def proc = "svn".execute()
+    proc.consumeProcessOutput()
+    proc.waitFor()
+} catch (IOException e) {
+    return false
+}

maven-scm-plugin/src/test/java/org/apache/maven/scm/plugin/ChangeLogMojoTest.java

@@ -108,6 +108,11 @@ public void testChangeLogWithBadUserDateFormat() throws Exception {
     }
 
     public void testChangeLogWithBadConnectionUrl() throws Exception {
+        if (!ScmTestCase.isSystemCmd(SvnScmTestUtils.SVN_COMMAND_LINE)) {
+            ScmTestCase.printSystemCmdUnavail(SvnScmTestUtils.SVN_COMMAND_LINE, getName());
+            return;
+        }
+
         ChangeLogMojo mojo = (ChangeLogMojo) lookupMojo(
                 "changelog", getTestFile("src/test/resources/mojos/changelog/changelogWithBadConnectionUrl.xml"));