objectionary#3267: Added xcop condition

eo-maven-plugin/src/test/java/org/eolang/maven/OptimizeMojoTest.java

@@ -46,6 +46,7 @@
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Assumptions;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
 import org.junit.jupiter.api.io.TempDir;
 import org.junit.jupiter.params.ParameterizedTest;
 
@@ -74,7 +75,8 @@ void checksPacks(final String pack) throws IOException {
 
     @ParameterizedTest
     @ClasspathSource(value = "org/eolang/maven/xmir2xmir/", glob = "**.yaml")
-    void checksXmirToXmir(final String pack, @TempDir final Path dir) throws Exception {
+    @ExtendWith(XcopCondition.class)
+    void checksXmirToXmir(final String pack, @TempDir final Path dir) {
         MatcherAssert.assertThat(
             "Xmir2xmir tests passes",
             new Xmir2Xmir(pack, dir),

eo-maven-plugin/src/test/java/org/eolang/maven/XcopCondition.java

@@ -0,0 +1,60 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016-2024 Objectionary.com
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package org.eolang.maven;
+
+import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.regex.Pattern;
+import java.util.stream.Stream;
+import org.junit.jupiter.api.extension.ConditionEvaluationResult;
+import org.junit.jupiter.api.extension.ExecutionCondition;
+import org.junit.jupiter.api.extension.ExtensionContext;
+
+/**
+ * JUnit's extension to skip a test if there is no xcop command.
+ * Xcop is needed to bring xml to a single format.
+ *
+ * @since 0.40
+ */
+@SuppressWarnings("JTCOP.RuleAllTestsHaveProductionClass")
+public final class XcopCondition implements ExecutionCondition {
+    @Override
+    public ConditionEvaluationResult evaluateExecutionCondition(
+        final ExtensionContext context) {
+        final ConditionEvaluationResult ret;
+        final boolean exists = Stream.of(
+            System.getenv("PATH").split(Pattern.quote(File.pathSeparator))
+            )
+            .map(Paths::get)
+            .anyMatch(path -> Files.exists(path.resolve("xcop")));
+        if (exists) {
+            ret = ConditionEvaluationResult.enabled("xcop is installed");
+        } else {
+            ret = ConditionEvaluationResult.disabled("There is not xcop here");
+        }
+        return ret;
+    }
+}

eo-maven-plugin/src/test/java/org/eolang/maven/Xmir2Xmir.java

@@ -43,6 +43,8 @@
  * Test scenario in YAML.
  *
  * @since 0.1
+ * @todo #3267:90min Add better error printing. Ideally, it should print the difference
+ *  the way the linux diff command does (line by line).
  */
 @SuppressWarnings({"JTCOP.RuleAllTestsHaveProductionClass", "JTCOP.RuleCorrectTestName"})
 public final class Xmir2Xmir {