feat(objectionary#3840): add a unit test for TrStepped

eo-parser/src/main/java/org/eolang/parser/TrStepped.java

@@ -37,7 +37,7 @@
 import org.cactoos.text.TextOf;
 
 /**
- * Trains that adds sheet names that were processed.
+ * Train that adds sheet names that were processed.
  *
  * @since 0.1
  */

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

@@ -0,0 +1,59 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016-2025 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.parser;
+
+import com.jcabi.matchers.XhtmlMatchers;
+import com.jcabi.xml.XML;
+import com.jcabi.xml.XMLDocument;
+import com.yegor256.xsline.Shift;
+import com.yegor256.xsline.StClasspath;
+import com.yegor256.xsline.TrDefault;
+import com.yegor256.xsline.Xsline;
+import org.hamcrest.MatcherAssert;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Test cases for {@link TrStepped}.
+ *
+ * @since 0.51
+ */
+final class TrSteppedTest {
+
+    @Test
+    void addsSheetName() {
+        MatcherAssert.assertThat(
+            "We expect the sheet name to be added",
+            new Xsline(
+                new TrStepped(
+                    new TrDefault<Shift>().with(
+                        new StClasspath("/org/eolang/parser/print/wrap-data.xsl"))
+                )).pass(
+                new XMLDocument("<program><language>EO</language></program>")
+            ).toString(),
+            XhtmlMatchers.hasXPath("/program/sheets/sheet[text()='wrap-data']")
+        );
+    }
+
+
+}