feat(objectionary#2642): unphi mojo tests

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

@@ -265,6 +265,16 @@ public <T extends AbstractMojo> FakeMaven execute(final Class<T> mojo) throws IO
                 "phiOutputDir",
                 this.workspace.absolute(Paths.get("target/phi")).toFile()
             );
+            this.params.putIfAbsent(
+                "unphiInputDir",
+                this.workspace.absolute(Paths.get("target/phi")).toFile()
+            );
+            this.params.putIfAbsent(
+                "unphiOutputDir",
+                this.workspace.absolute(
+                    Paths.get(String.format("target/%s", ParseMojo.DIR))
+                ).toFile()
+            );
         }
         final Moja<T> moja = new Moja<>(mojo);
         for (final Map.Entry<String, ?> entry : this.allowedParams(mojo).entrySet()) {

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

@@ -0,0 +1,96 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016-2023 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 com.jcabi.xml.XML;
+import com.jcabi.xml.XMLDocument;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import org.cactoos.list.ListOf;
+import org.cactoos.text.TextOf;
+import org.eolang.jucs.ClasspathSource;
+import org.eolang.maven.util.HmBase;
+import org.hamcrest.MatcherAssert;
+import org.hamcrest.Matchers;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.yaml.snakeyaml.Yaml;
+
+/**
+ * Test cases for {@link UnphiMojo}.
+ * @since 0.34.0
+ */
+class UnphiMojoTest {
+    @Test
+    void createsFile(@TempDir final Path temp) throws Exception {
+        new HmBase(temp).save(
+            "{std ↦ Φ.org.eolang.io.stdout, y ↦ Φ.org.eolang.x}",
+            Paths.get("target/phi/std.phi")
+        );
+        MatcherAssert.assertThat(
+            String.format(
+                "There should be file with .%s extension after parsing phi to XMIR, but there isn't",
+                TranspileMojo.EXT
+            ),
+            new FakeMaven(temp)
+                .execute(UnphiMojo.class)
+                .result(),
+            Matchers.hasKey(String.format("target/%s/std.xmir", ParseMojo.DIR))
+        );
+    }
+
+    @ParameterizedTest
+    @Disabled
+    @ClasspathSource(value = "org/eolang/maven/unphi", glob = "**.yaml")
+    void checksUnphiPacks(final String pack, @TempDir final Path temp) throws Exception {
+        final Map<String, Object> map = new Yaml().load(pack);
+        final String phi = map.get("phi").toString();
+        new HmBase(temp).save(phi, Paths.get("target/phi/main.phi"));
+        final List<String> failures = new ListOf<>();
+        new FakeMaven(temp).execute(UnphiMojo.class);
+        for (final String xpath : (Iterable<String>) map.get("tests")) {
+            final List<XML> nodes = new XMLDocument(
+                new TextOf(
+                    Paths.get(String.format("target/%s/main.xmir", ParseMojo.DIR))
+                ).asString()
+            ).nodes(xpath);
+            if (nodes.isEmpty()) {
+                failures.add(xpath);
+            }
+        }
+        MatcherAssert.assertThat(
+            String.format(
+                "Failed to parse phi expression: %s; failed tests: %s",
+                phi, Arrays.toString(failures.toArray())
+            ),
+            failures,
+            Matchers.empty()
+        );
+    }
+}

eo-parser/src/test/java/org/eolang/parser/EoSyntaxTest.java

@@ -48,7 +48,6 @@
  * @since 0.1
  */
 final class EoSyntaxTest {
-
     @Test
     void parsesSimpleCode() throws Exception {
         MatcherAssert.assertThat(