refactor(#4780): remove unnecessary ContainsFiles.java class and update simian.yml

.github/workflows/simian.yml

@@ -21,4 +21,4 @@ jobs:
           distribution: 'temurin'
           java-version: 17
       - run: wget --quiet http://public.yegor256.com/simian.jar -O /tmp/simian.jar
-      - run: java -jar /tmp/simian.jar -threshold=15 "-excludes=**/EOsocketTest.java" "-excludes=**/gen" "-excludes=**/it" "**/*.java" "-excludes=**/ContainsFiles.java"
+      - run: java -jar /tmp/simian.jar -threshold=15 "-excludes=**/EOsocketTest.java" "-excludes=**/gen" "-excludes=**/it" "**/*.java"

eo-integration-tests/src/test/java/org/eolang/maven/MjAssembleIT.java

@@ -15,6 +15,7 @@
 import java.nio.file.Path;
 import org.hamcrest.MatcherAssert;
 import org.hamcrest.Matchers;
+import org.hamcrest.io.FileMatchers;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 
@@ -38,7 +39,7 @@ void assemblesTogether(@Mktmp final Path temp) throws IOException {
                 f.files()
                     .file("src/main/eo/foo/x/main.eo")
                     .write(MjAssembleIT.program().getBytes(StandardCharsets.UTF_8));
-                MjAssembleIT.appendItself(f);
+                MjAssembleIT.registerAssemble(f);
                 f.exec("package");
                 MatcherAssert.assertThat(
                     String.format(
@@ -79,12 +80,12 @@ void assemblesNotFailWithFailOnError(@Mktmp final Path temp) throws IOException
                 f.files()
                     .file("src/main/eo/one/main.eo")
                     .write(prog.getBytes(StandardCharsets.UTF_8));
-                MjAssembleIT.appendItself(f);
+                MjAssembleIT.registerAssemble(f);
                 f.exec("test");
                 MatcherAssert.assertThat(
                     "Even if the eo program invalid we still have to parse it, but we didn't",
-                    temp.resolve(String.format("target/eo/%s", "1-parse")).toAbsolutePath(),
-                    new ContainsFiles("**/main.xmir")
+                    temp.resolve("target/eo/1-parse/one/main.xmir").toAbsolutePath().toFile(),
+                    FileMatchers.anExistingFile()
                 );
             }
         );
@@ -103,7 +104,7 @@ private static String program() {
         );
     }
 
-    private static Execution appendItself(final Farea farea) throws IOException {
+    private static Execution registerAssemble(final Farea farea) throws IOException {
         return new AppendedPlugin(farea).value()
             .goals("register", "assemble");
     }