diff --git a/.github/workflows/bld.yml b/.github/workflows/bld.yml
index b2bf24e..6966bcb 100644
--- a/.github/workflows/bld.yml
+++ b/.github/workflows/bld.yml
@@ -7,6 +7,7 @@ jobs:
     strategy:
       matrix:
         java-version: [ 17, 21, 24 ]
+        kotlin-version: [ 1.9.25, 2.0.21, 2.1.20 ]
         os: [ ubuntu-latest, windows-latest, macos-latest ]
 
     runs-on: ${{ matrix.os }}
@@ -35,4 +36,4 @@ jobs:
         run: ./bld download
 
       - name: Run tests
-        run: ./bld compile test
+        run: ./bld compile test
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index dfdb820..1bf9192 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,10 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="EntryPointsManager">
-    <entry_points version="2.0">
-      <entry_point TYPE="field" FQNAME="rife.bld.extension.checkstyle.OutputFormat PLAIN" />
-      <entry_point TYPE="field" FQNAME="rife.bld.extension.checkstyle.OutputFormat SARIF" />
-    </entry_points>
     <pattern value="rife.bld.extension.CheckstyleOperationBuild" />
     <pattern value="rife.bld.extension.CheckstyleOperationBuild" method="jacoco" />
     <pattern value="rife.bld.extension.CheckstyleOperationBuild" method="pmd" />
@@ -29,7 +25,7 @@
     </option>
     <option name="skipTestSources" value="false" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="17" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" project-jdk-name="17" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build" />
   </component>
 </project>
\ No newline at end of file
diff --git a/README.md b/README.md
index f02c333..bec8a94 100644
--- a/README.md
+++ b/README.md
@@ -45,5 +45,5 @@ not provided by the extension. For example:
 
 ```java
 repositories = List.of(MAVEN_CENTRAL);
-scope(test).include(dependency("com.puppycrawl.tools", "checkstyle", version(10, 24, 0)));
+scope(test).include(dependency("com.puppycrawl.tools", "checkstyle", version(10, 23, 1)));
 ```
diff --git a/examples/lib/bld/bld-wrapper.properties b/examples/lib/bld/bld-wrapper.properties
index 3b1cdef..ab1936c 100644
--- a/examples/lib/bld/bld-wrapper.properties
+++ b/examples/lib/bld/bld-wrapper.properties
@@ -1,7 +1,7 @@
 bld.downloadExtensionJavadoc=false
 bld.downloadExtensionSources=true
 bld.downloadLocation=
-bld.extension-checkstyle=com.uwyn.rife2:bld-checkstyle:1.0.15
+bld.extension-checkstyle=com.uwyn.rife2:bld-checkstyle:1.0.14
 bld.repositories=MAVEN_LOCAL,MAVEN_CENTRAL,RIFE2_SNAPSHOTS,RIFE2_RELEASES
 bld.sourceDirectories=
 bld.version=2.2.1
diff --git a/examples/src/bld/java/com/example/ExamplesBuild.java b/examples/src/bld/java/com/example/ExamplesBuild.java
index ac1419d..f3a5f6d 100644
--- a/examples/src/bld/java/com/example/ExamplesBuild.java
+++ b/examples/src/bld/java/com/example/ExamplesBuild.java
@@ -26,7 +26,7 @@ public class ExamplesBuild extends BaseProject {
 
         repositories = List.of(MAVEN_CENTRAL);
 
-        scope(test).include(dependency("com.puppycrawl.tools", "checkstyle", version(10, 24, 0)));
+        scope(test).include(dependency("com.puppycrawl.tools", "checkstyle", version(10, 23, 1)));
 
         testOperation().mainClass("com.example.ExamplesTest");
     }
diff --git a/src/bld/java/rife/bld/extension/CheckstyleOperationBuild.java b/src/bld/java/rife/bld/extension/CheckstyleOperationBuild.java
index 7a2c1a7..c720a08 100644
--- a/src/bld/java/rife/bld/extension/CheckstyleOperationBuild.java
+++ b/src/bld/java/rife/bld/extension/CheckstyleOperationBuild.java
@@ -22,9 +22,6 @@ import rife.bld.publish.PublishDeveloper;
 import rife.bld.publish.PublishLicense;
 import rife.bld.publish.PublishScm;
 
-import java.io.File;
-import java.nio.file.Files;
-import java.nio.file.Path;
 import java.util.List;
 import java.util.Locale;
 
@@ -37,7 +34,7 @@ public class CheckstyleOperationBuild extends Project {
     public CheckstyleOperationBuild() {
         pkg = "rife.bld.extension";
         name = "CheckstyleOperation";
-        version = version(1, 0, 15);
+        version = version(1, 0, 15, "SNAPSHOT");
 
         javaRelease = 17;
 
@@ -49,7 +46,7 @@ public class CheckstyleOperationBuild extends Project {
         scope(compile)
                 .include(dependency("com.uwyn.rife2", "bld", version(2, 2, 1)));
         scope(test)
-                .include(dependency("com.puppycrawl.tools", "checkstyle", version(10, 24, 0)))
+                .include(dependency("com.puppycrawl.tools", "checkstyle", version(10, 23, 1)))
                 .include(dependency("org.junit.jupiter", "junit-jupiter", version(5, 12, 2)))
                 .include(dependency("org.junit.platform", "junit-platform-console-standalone", version(1, 12, 2)))
                 .include(dependency("org.assertj", "assertj-core", version(3, 27, 3)));
@@ -110,32 +107,6 @@ public class CheckstyleOperationBuild extends Project {
                     .command("scripts/cliargs.sh")
                     .execute();
         }
-
-        var testResultsDir = "build/test-results/test/";
-        var op = testOperation().fromProject(this);
-        op.testToolOptions().reportsDir(new File(testResultsDir));
-
-        Exception ex = null;
-        try {
-            op.execute();
-        } catch (Exception e) {
-            ex = e;
-        }
-
-        var xunitViewer = new File("/usr/bin/xunit-viewer");
-        if (xunitViewer.exists() && xunitViewer.canExecute()) {
-            var reportsDir = "build/reports/tests/test/";
-
-            Files.createDirectories(Path.of(reportsDir));
-
-            new ExecOperation()
-                    .fromProject(this)
-                    .command(xunitViewer.getPath(), "-r", testResultsDir, "-o", reportsDir + "index.html")
-                    .execute();
-        }
-
-        if (ex != null) {
-            throw ex;
-        }
+        super.test();
     }
 }
diff --git a/src/main/java/rife/bld/extension/CheckstyleOperation.java b/src/main/java/rife/bld/extension/CheckstyleOperation.java
index cdcd630..97eeb55 100644
--- a/src/main/java/rife/bld/extension/CheckstyleOperation.java
+++ b/src/main/java/rife/bld/extension/CheckstyleOperation.java
@@ -314,25 +314,6 @@ public class CheckstyleOperation extends AbstractProcessOperation<CheckstyleOper
         return this;
     }
 
-    /**
-     * Generates to output a suppression xml that will have suppress elements with {@code checks} and {@code files}
-     * attributes only to use to suppress all violations from user's config. Instead of printing every violation, all
-     * violations will be catched and single suppressions xml file will be printed out. Used only with the
-     * {@link #configurationFile(String) configurationFile} option. Output location can be
-     * specified with the {@link #outputPath(String) output} option.
-     *
-     * @param generateChecksAndFileSuppression {@code true} or {@code false}
-     * @return the checkstyle operation
-     */
-    public CheckstyleOperation generateChecksAndFileSuppression(boolean generateChecksAndFileSuppression) {
-        if (generateChecksAndFileSuppression) {
-            options_.put("-G", "");
-        } else {
-            options_.remove("-G");
-        }
-        return this;
-    }
-
     /**
      * Generates to output a suppression xml to use to suppress all violations from user's config. Instead of printing
      * every violation, all violations will be caught and single suppressions xml file will be printed out.
@@ -474,7 +455,6 @@ public class CheckstyleOperation extends AbstractProcessOperation<CheckstyleOper
      * @return the checkstyle operation
      * @see #sourceDir(Collection)
      */
-    @SuppressWarnings("UnusedReturnValue")
     public CheckstyleOperation sourceDir(File... dir) {
         return sourceDir(List.of(dir));
     }
@@ -486,7 +466,6 @@ public class CheckstyleOperation extends AbstractProcessOperation<CheckstyleOper
      * @return the checkstyle operation
      * @see #sourceDirPaths(Collection)
      */
-    @SuppressWarnings("UnusedReturnValue")
     public CheckstyleOperation sourceDir(Path... dir) {
         return sourceDirPaths(List.of(dir));
     }
diff --git a/src/test/java/rife/bld/extension/CheckstyleOperationTest.java b/src/test/java/rife/bld/extension/CheckstyleOperationTest.java
index e4a6511..0d0e1b2 100644
--- a/src/test/java/rife/bld/extension/CheckstyleOperationTest.java
+++ b/src/test/java/rife/bld/extension/CheckstyleOperationTest.java
@@ -18,8 +18,6 @@ package rife.bld.extension;
 
 import org.assertj.core.api.AutoCloseableSoftAssertions;
 import org.junit.jupiter.api.BeforeAll;
-import org.junit.jupiter.api.DisplayName;
-import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.condition.EnabledOnOs;
 import org.junit.jupiter.api.condition.OS;
@@ -43,12 +41,12 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatCode;
 
 class CheckstyleOperationTest {
+    public static final String SRC_MAIN_JAVA = "src/main/java";
+    public static final String SRC_TEST_JAVA = "src/test/java";
     private static final String ADD = "add";
     private static final String BAR = "bar";
     private static final String FOO = "foo";
     private static final String REMOVE = "remove";
-    private static final String SRC_MAIN_JAVA = "src/main/java";
-    private static final String SRC_TEST_JAVA = "src/test/java";
 
     @BeforeAll
     static void beforeAll() {
@@ -61,349 +59,272 @@ class CheckstyleOperationTest {
         logger.setUseParentHandlers(false);
     }
 
-    private CheckstyleOperation newCheckstyleOperation() {
-        return new CheckstyleOperation().fromProject(new Project());
+
+    @Test
+    void branchMatchingXpath() {
+        var op = new CheckstyleOperation().fromProject(new Project()).branchMatchingXpath(FOO);
+        assertThat(op.options().get("-b")).isEqualTo(FOO);
     }
 
-    @Nested
-    @DisplayName("Exclude Tests")
-    class ExcludeTests {
-        private static final String e = "-e ";
-        private static final String x = "-x ";
-        private final File srcMainJavaDir = new File(SRC_MAIN_JAVA);
-        private final File srcTestJavaDir = new File(SRC_TEST_JAVA);
+    @Test
+    @EnabledOnOs(OS.LINUX)
+    void checkAllParameters() throws IOException {
+        var args = Files.readAllLines(Paths.get("src", "test", "resources", "checkstyle-args.txt"));
 
-        @Test
-        void excludeFromFileArray() {
-            var op = newCheckstyleOperation().exclude(srcTestJavaDir, srcMainJavaDir);
-            assertThat(String.join(" ", op.executeConstructProcessCommandList()))
-                    .contains(e + srcTestJavaDir.getAbsolutePath()).contains(e + srcMainJavaDir.getAbsolutePath());
-        }
+        assertThat(args).isNotEmpty();
 
-        @Test
-        void excludeFromFileList() {
-            var op = newCheckstyleOperation()
-                    .exclude(List.of(srcTestJavaDir, srcMainJavaDir));
-            assertThat(String.join(" ", op.executeConstructProcessCommandList()))
-                    .contains(e + srcTestJavaDir.getAbsolutePath()).contains(e + srcMainJavaDir.getAbsolutePath());
-        }
+        var params = new CheckstyleOperation()
+                .fromProject(new Project())
+                .branchMatchingXpath("xpath")
+                .debug(true)
+                .configurationFile(new File("config"))
+                .exclude(SRC_MAIN_JAVA)
+                .excludeRegex("regex")
+                .executeIgnoredModules(true)
+                .format(OutputFormat.XML)
+                .generateXpathSuppression(true)
+                .javadocTree(true)
+                .outputPath(new File("optionPath"))
+                .propertiesFile(new File("properties"))
+                .suppressionLineColumnNumber("12")
+                .tabWith(1)
+                .tree(true)
+                .treeWithComments(true)
+                .treeWithJavadoc(true)
+                .executeConstructProcessCommandList();
 
-        @Test
-        void excludeFromPathArray() {
-            var op = newCheckstyleOperation()
-                    .exclude(srcTestJavaDir.toPath(), srcMainJavaDir.toPath());
-            assertThat(String.join(" ", op.executeConstructProcessCommandList()))
-                    .contains(e + srcTestJavaDir.getAbsolutePath()).contains(e + srcMainJavaDir.getAbsolutePath());
-        }
-
-        @Test
-        void excludeFromPathList() {
-            var op = newCheckstyleOperation()
-                    .excludePaths(List.of(srcTestJavaDir.toPath(), srcMainJavaDir.toPath()));
-            assertThat(String.join(" ", op.executeConstructProcessCommandList()))
-                    .contains(e + srcTestJavaDir.getAbsolutePath()).contains(e + srcMainJavaDir.getAbsolutePath());
-        }
-
-        @Test
-        void excludeFromStringArray() {
-            var op = newCheckstyleOperation().exclude(SRC_MAIN_JAVA, SRC_TEST_JAVA);
-            assertThat(String.join(" ", op.executeConstructProcessCommandList()))
-                    .contains(e + srcTestJavaDir.getAbsolutePath()).contains(e + srcMainJavaDir.getAbsolutePath());
-        }
-
-        @Test
-        void excludeFromStringList() {
-            var op = newCheckstyleOperation()
-                    .excludeStrings(List.of(SRC_MAIN_JAVA, SRC_TEST_JAVA));
-            assertThat(String.join(" ", op.executeConstructProcessCommandList()))
-                    .contains(e + srcMainJavaDir.getAbsolutePath()).contains(e + srcTestJavaDir.getAbsolutePath());
-        }
-
-        @Test
-        void excludeNonExistingPath() {
-            var op = newCheckstyleOperation().exclude(FOO);
-            assertThat(String.join(" ", op.executeConstructProcessCommandList()))
-                    .doesNotContain(e + FOO);
-        }
-
-        @Test
-        void excludeNonExistingPaths() {
-            var op = newCheckstyleOperation().exclude(FOO, BAR);
-            assertThat(String.join(" ", op.executeConstructProcessCommandList()))
-                    .doesNotContain(e + FOO).doesNotContain(e + BAR);
-        }
-
-        @Test
-        void excludeRegex() {
-            var op = newCheckstyleOperation().excludeRegex(FOO, BAR);
-            assertThat(String.join(" ", op.executeConstructProcessCommandList())).contains(x + FOO, x + BAR);
-        }
-
-        @Test
-        void excludeRegexFromList() {
-            var op = newCheckstyleOperation().excludeRegex(List.of(FOO, BAR));
-            assertThat(String.join(" ", op.executeConstructProcessCommandList())).contains(x + FOO, x + BAR);
-        }
-    }
-
-    @Nested
-    @DisplayName("Execute Tests")
-    class ExecuteTests {
-        @Test
-        void execute() throws IOException, ExitStatusException, InterruptedException {
-            var tmpFile = File.createTempFile("checkstyle-google", ".txt");
-            tmpFile.deleteOnExit();
-            var op = new CheckstyleOperation()
-                    .fromProject(new WebProject())
-                    .sourceDir(SRC_MAIN_JAVA, SRC_TEST_JAVA)
-                    .configurationFile(Path.of("src/test/resources/google_checks.xml"))
-                    .outputPath(tmpFile.toPath());
-            op.execute();
-            assertThat(tmpFile).as("tmp file should exist").exists();
-        }
-
-        @Test
-        void executeConstructProcessCommandList() {
-            var op = new CheckstyleOperation().fromProject(new BaseProject())
-                    .configurationFile("config/checkstyle.xml")
-                    .branchMatchingXpath("xpath")
-                    .propertiesFile("config/checkstyle.properties")
-                    .debug(true)
-                    .executeIgnoredModules(true)
-                    .sourceDir(SRC_MAIN_JAVA, SRC_TEST_JAVA);
-            assertThat(String.join(" ", op.executeConstructProcessCommandList()))
-                    .startsWith("java -cp ")
-                    .endsWith(
-                            "com.puppycrawl.tools.checkstyle.Main " +
-                                    "-p config/checkstyle.properties " +
-                                    "-b xpath " +
-                                    "-c config/checkstyle.xml " +
-                                    "-d -E " +
-                                    new File(SRC_MAIN_JAVA).getAbsolutePath() + " " +
-                                    new File(SRC_TEST_JAVA).getAbsolutePath());
-        }
-
-        @Test
-        void executeIgnoredModules() {
-            var op = newCheckstyleOperation().executeIgnoredModules(true);
-            assertThat(op.options().containsKey("-E")).as(ADD).isTrue();
-            op = op.executeIgnoredModules(false);
-            assertThat(op.options().containsKey("-E")).as(REMOVE).isFalse();
-        }
-
-        @Test
-        void executeNoProject() {
-            var op = new CheckstyleOperation();
-            assertThatCode(op::execute).isInstanceOf(ExitStatusException.class);
-        }
-
-        @Test
-        void executeSunChecks() throws IOException {
-            var tmpFile = File.createTempFile("checkstyle-sun", ".txt");
-            tmpFile.deleteOnExit();
-            var op = newCheckstyleOperation()
-                    .sourceDir(SRC_MAIN_JAVA, SRC_TEST_JAVA)
-                    .configurationFile("src/test/resources/sun_checks.xml")
-                    .outputPath(tmpFile.getAbsolutePath());
-            assertThatCode(op::execute).isInstanceOf(ExitStatusException.class);
-            assertThat(tmpFile).as("tmp file should exist").exists();
-        }
-    }
-
-    @Nested
-    @DisplayName("Options Tests")
-    class OptionsTests {
-        @Test
-        void branchMatchingXpath() {
-            var op = newCheckstyleOperation().branchMatchingXpath(FOO);
-            assertThat(op.options().get("-b")).isEqualTo(FOO);
-        }
-
-        @Test
-        @EnabledOnOs(OS.LINUX)
-        void checkAllParameters() throws IOException {
-            var args = Files.readAllLines(Paths.get("src", "test", "resources", "checkstyle-args.txt"));
-
-            assertThat(args).isNotEmpty();
-
-            var params = newCheckstyleOperation()
-                    .branchMatchingXpath("xpath")
-                    .debug(true)
-                    .configurationFile(new File("config"))
-                    .exclude(SRC_MAIN_JAVA)
-                    .excludeRegex("regex")
-                    .executeIgnoredModules(true)
-                    .format(OutputFormat.XML)
-                    .generateXpathSuppression(true)
-                    .generateChecksAndFileSuppression(true)
-                    .javadocTree(true)
-                    .outputPath(new File("optionPath"))
-                    .propertiesFile(new File("properties"))
-                    .suppressionLineColumnNumber("12")
-                    .tabWith(1)
-                    .tree(true)
-                    .treeWithComments(true)
-                    .treeWithJavadoc(true)
-                    .executeConstructProcessCommandList();
-
-            try (var softly = new AutoCloseableSoftAssertions()) {
-                for (var p : args) {
-                    var found = false;
-                    for (var a : params) {
-                        if (a.startsWith(p)) {
-                            found = true;
-                            break;
-                        }
+        try (var softly = new AutoCloseableSoftAssertions()) {
+            for (var p : args) {
+                var found = false;
+                for (var a : params) {
+                    if (a.startsWith(p)) {
+                        found = true;
+                        break;
                     }
-                    softly.assertThat(found).as("%s not found.", p).isTrue();
                 }
+                softly.assertThat(found).as(p + " not found.").isTrue();
             }
         }
+    }
 
-        @Test
-        void configurationFile() {
-            var op = newCheckstyleOperation().configurationFile(FOO);
-            assertThat(op.options().get("-c")).isEqualTo(FOO);
-        }
+    @Test
+    void configurationFile() {
+        var op = new CheckstyleOperation().fromProject(new Project()).configurationFile(FOO);
+        assertThat(op.options().get("-c")).isEqualTo(FOO);
+    }
 
-        @Test
-        void debug() {
-            var op = newCheckstyleOperation().debug(true);
-            assertThat(op.options().containsKey("-d")).as(ADD).isTrue();
-            op = op.debug(false);
-            assertThat(op.options().containsKey("-d")).as(REMOVE).isFalse();
-        }
+    @Test
+    void debug() {
+        var op = new CheckstyleOperation().fromProject(new Project()).debug(true);
+        assertThat(op.options().containsKey("-d")).as(ADD).isTrue();
+        op = op.debug(false);
+        assertThat(op.options().containsKey("-d")).as(REMOVE).isFalse();
+    }
 
-        @Test
-        void format() {
-            var op = newCheckstyleOperation().format(OutputFormat.XML);
-            assertThat(op.options().get("-f")).isEqualTo("xml");
-        }
+    @Test
+    void exclude() {
+        var foo = new File(SRC_MAIN_JAVA);
+        var bar = new File(SRC_TEST_JAVA);
+        var e = "-e ";
 
-        @Test
-        void generateChecksAndFileSuppression() {
-            var op = newCheckstyleOperation().generateChecksAndFileSuppression(true);
-            assertThat(op.options().containsKey("-G")).as(ADD).isTrue();
-            op = op.generateChecksAndFileSuppression(false);
-            assertThat(op.options().containsKey("-G")).as(REMOVE).isFalse();
-        }
+        var op = new CheckstyleOperation().fromProject(new Project()).exclude(SRC_MAIN_JAVA, SRC_TEST_JAVA);
+        assertThat(String.join(" ", op.executeConstructProcessCommandList())).as("String...")
+                .contains(e + foo.getAbsolutePath()).contains(e + bar.getAbsolutePath());
 
-        @Test
-        void generateXpathSuppression() {
-            var op = newCheckstyleOperation().generateXpathSuppression(true);
-            assertThat(op.options().containsKey("-g")).as(ADD).isTrue();
-            op = op.generateXpathSuppression(false);
-            assertThat(op.options().containsKey("-g")).as(REMOVE).isFalse();
-        }
+        op = new CheckstyleOperation().fromProject(new Project()).excludeStrings(List.of(SRC_MAIN_JAVA, SRC_TEST_JAVA));
+        assertThat(String.join(" ", op.executeConstructProcessCommandList())).as("List(String...)")
+                .contains(e + foo.getAbsolutePath()).contains(e + bar.getAbsolutePath());
 
-        @Test
-        void javadocTree() {
-            var op = newCheckstyleOperation().javadocTree(true);
-            assertThat(op.options().containsKey("-j")).as(ADD).isTrue();
-            op = op.javadocTree(false);
-            assertThat(op.options().containsKey("-j")).as(REMOVE).isFalse();
-        }
+        op = new CheckstyleOperation().fromProject(new Project()).exclude(foo, bar);
+        assertThat(String.join(" ", op.executeConstructProcessCommandList())).as("File...")
+                .contains(e + foo.getAbsolutePath()).contains(e + bar.getAbsolutePath());
 
-        @Test
-        void outputPath() {
-            var op = newCheckstyleOperation().outputPath(FOO);
-            assertThat(op.options().get("-o")).isEqualTo(FOO);
-        }
+        op = new CheckstyleOperation().fromProject(new Project()).exclude(List.of(foo, bar));
+        assertThat(String.join(" ", op.executeConstructProcessCommandList())).as("List(File...)")
+                .contains(e + foo.getAbsolutePath()).contains(e + bar.getAbsolutePath());
 
-        @Test
-        void propertiesFile() {
-            var op = newCheckstyleOperation().propertiesFile(FOO);
-            assertThat(op.options().get("-p")).isEqualTo(FOO);
+        op = new CheckstyleOperation().fromProject(new Project()).exclude(foo.toPath(), bar.toPath());
+        assertThat(String.join(" ", op.executeConstructProcessCommandList())).as("Path...")
+                .contains(e + foo.getAbsolutePath()).contains(e + bar.getAbsolutePath());
 
-            var fooPath = Path.of(FOO);
-            op = op.propertiesFile(fooPath);
-            assertThat(op.options().get("-p")).isEqualTo(fooPath.toFile().getAbsolutePath());
-        }
+        op = new CheckstyleOperation().fromProject(new Project()).excludePaths(List.of(foo.toPath(), bar.toPath()));
+        assertThat(String.join(" ", op.executeConstructProcessCommandList())).as("List(Path...)")
+                .contains(e + foo.getAbsolutePath()).contains(e + bar.getAbsolutePath());
+    }
 
-        @Test
-        void suppressionLineColumnNumber() {
-            var op = newCheckstyleOperation().suppressionLineColumnNumber(FOO + ':' + BAR);
-            assertThat(op.options().get("-s")).isEqualTo(FOO + ':' + BAR);
-        }
+    @Test
+    void excludeRegex() {
+        var op = new CheckstyleOperation().fromProject(new Project()).excludeRegex(FOO, BAR);
+        var x = "-x ";
+        assertThat(String.join(" ", op.executeConstructProcessCommandList())).contains(x + FOO, x + BAR);
 
-        @Test
-        void tabWith() {
-            var op = newCheckstyleOperation().tabWith(9);
-            assertThat(op.options().get("-w")).isEqualTo("9");
-        }
+        op = new CheckstyleOperation().fromProject(new Project()).excludeRegex(List.of(FOO, BAR));
+        assertThat(String.join(" ", op.executeConstructProcessCommandList())).as("as list").contains(x + FOO, x + BAR);
+    }
 
-        @Test
-        void tree() {
-            var op = newCheckstyleOperation().tree(true);
-            assertThat(op.options().containsKey("-t")).as(ADD).isTrue();
-            op = op.tree(false);
-            assertThat(op.options().containsKey("-t")).as(REMOVE).isFalse();
-        }
+    @Test
+    void execute() throws IOException, ExitStatusException, InterruptedException {
+        var tmpFile = File.createTempFile("checkstyle-google", ".txt");
+        tmpFile.deleteOnExit();
+        var op = new CheckstyleOperation()
+                .fromProject(new WebProject())
+                .sourceDir(SRC_MAIN_JAVA, SRC_TEST_JAVA)
+                .configurationFile(Path.of("src/test/resources/google_checks.xml"))
+                .outputPath(tmpFile.toPath());
+        op.execute();
+        assertThat(tmpFile).exists();
+    }
 
-        @Test
-        void treeWithComments() {
-            var op = newCheckstyleOperation().treeWithComments(true);
-            assertThat(op.options().containsKey("-T")).as(ADD).isTrue();
-            op = op.treeWithComments(false);
-            assertThat(op.options().containsKey("-T")).as(REMOVE).isFalse();
-        }
+    @Test
+    void executeConstructProcessCommandList() {
+        var op = new CheckstyleOperation().fromProject(new BaseProject())
+                .configurationFile("config/checkstyle.xml")
+                .branchMatchingXpath("xpath")
+                .propertiesFile("config/checkstyle.properties")
+                .debug(true)
+                .executeIgnoredModules(true)
+                .sourceDir(SRC_MAIN_JAVA, SRC_TEST_JAVA);
+        assertThat(String.join(" ", op.executeConstructProcessCommandList()))
+                .startsWith("java -cp ")
+                .endsWith(
+                        "com.puppycrawl.tools.checkstyle.Main " +
+                                "-p config/checkstyle.properties " +
+                                "-b xpath " +
+                                "-c config/checkstyle.xml " +
+                                "-d -E " +
+                                new File(SRC_MAIN_JAVA).getAbsolutePath() + " " +
+                                new File(SRC_TEST_JAVA).getAbsolutePath());
+    }
 
-        @Test
-        void treeWithJavadoc() {
-            var op = newCheckstyleOperation().treeWithJavadoc(true);
-            assertThat(op.options().containsKey("-J")).as(ADD).isTrue();
-            op = op.treeWithJavadoc(false);
-            assertThat(op.options().containsKey("-J")).as(REMOVE).isFalse();
-        }
+    @Test
+    void executeIgnoredModules() {
+        var op = new CheckstyleOperation().fromProject(new Project()).executeIgnoredModules(true);
+        assertThat(op.options().containsKey("-E")).as(ADD).isTrue();
+        op = op.executeIgnoredModules(false);
+        assertThat(op.options().containsKey("-E")).as(REMOVE).isFalse();
+    }
 
-        @Nested
-        @DisplayName("Source Dir Tests")
-        class SourceDirTests {
-            private final File bar = new File(BAR);
-            private final File foo = new File(FOO);
-            private final CheckstyleOperation op = newCheckstyleOperation().sourceDir(FOO, BAR);
+    @Test
+    void executeNoProject() {
+        var op = new CheckstyleOperation();
+        assertThatCode(op::execute).isInstanceOf(ExitStatusException.class);
+    }
 
-            @Test
-            void sourceDirFromFileArray() {
-                op.sourceDir(foo, bar);
-                assertThat(op.sourceDir()).as("File...").hasSize(2).contains(foo, bar);
-                op.sourceDir().clear();
-            }
+    @Test
+    void executeSunChecks() throws IOException {
+        var tmpFile = File.createTempFile("checkstyle-sun", ".txt");
+        tmpFile.deleteOnExit();
+        var op = new CheckstyleOperation()
+                .fromProject(new WebProject())
+                .sourceDir(SRC_MAIN_JAVA, SRC_TEST_JAVA)
+                .configurationFile("src/test/resources/sun_checks.xml")
+                .outputPath(tmpFile.getAbsolutePath());
+        assertThatCode(op::execute).isInstanceOf(ExitStatusException.class);
+        assertThat(tmpFile).exists();
+    }
 
-            @Test
-            void sourceDirFromFileList() {
-                op.sourceDir(List.of(foo, bar));
-                assertThat(op.sourceDir()).as("List(File...)").hasSize(2).contains(foo, bar);
-                op.sourceDir().clear();
-            }
+    @Test
+    void format() {
+        var op = new CheckstyleOperation().fromProject(new Project()).format(OutputFormat.XML);
+        assertThat(op.options().get("-f")).isEqualTo("xml");
+    }
 
-            @Test
-            void sourceDirFromPathArray() {
-                op.sourceDir(foo.toPath(), bar.toPath());
-                assertThat(op.sourceDir()).as("Path...").hasSize(2).contains(foo, bar);
-                op.sourceDir().clear();
-            }
+    @Test
+    void generateXpathSuppression() {
+        var op = new CheckstyleOperation().fromProject(new Project()).generateXpathSuppression(true);
+        assertThat(op.options().containsKey("-g")).as(ADD).isTrue();
+        op = op.generateXpathSuppression(false);
+        assertThat(op.options().containsKey("-g")).as(REMOVE).isFalse();
+    }
 
-            @Test
-            void sourceDirFromPathList() {
-                op.sourceDirPaths(List.of(foo.toPath(), bar.toPath()));
-                assertThat(op.sourceDir()).as("List(Path...)").hasSize(2).contains(foo, bar);
-                op.sourceDir().clear();
-            }
+    @Test
+    void javadocTree() {
+        var op = new CheckstyleOperation().fromProject(new Project()).javadocTree(true);
+        assertThat(op.options().containsKey("-j")).as(ADD).isTrue();
+        op = op.javadocTree(false);
+        assertThat(op.options().containsKey("-j")).as(REMOVE).isFalse();
+    }
 
-            @Test
-            void sourceDirFromStringArray() {
-                op.sourceDir("foo", "bar");
-                assertThat(op.sourceDir()).as("String...").hasSize(2).contains(foo, bar);
-                op.sourceDir().clear();
-            }
+    @Test
+    void outputPath() {
+        var op = new CheckstyleOperation().fromProject(new Project()).outputPath(FOO);
+        assertThat(op.options().get("-o")).isEqualTo(FOO);
+    }
 
-            @Test
-            void sourceDirFromStringList() {
-                op.sourceDirStrings(List.of(FOO, BAR));
-                assertThat(op.sourceDir()).as("List(String...)").hasSize(2).contains(foo, bar);
-                op.sourceDir().clear();
-            }
-        }
+    @Test
+    void propertiesFile() {
+        var op = new CheckstyleOperation().fromProject(new Project()).propertiesFile(FOO);
+        assertThat(op.options().get("-p")).isEqualTo(FOO);
+
+        var fooPath = Path.of(FOO);
+        op = op.propertiesFile(fooPath);
+        assertThat(op.options().get("-p")).isEqualTo(fooPath.toFile().getAbsolutePath());
+    }
+
+    @Test
+    void sourceDir() {
+        var foo = new File(FOO);
+        var bar = new File(BAR);
+
+        var op = new CheckstyleOperation().fromProject(new Project()).sourceDir(FOO, BAR);
+        assertThat(op.sourceDir()).as("String...").hasSize(2).contains(foo, bar);
+        op.sourceDir().clear();
+
+        op = op.sourceDirStrings(List.of(FOO, BAR));
+        assertThat(op.sourceDir()).as("List(String...)").hasSize(2).contains(foo, bar);
+        op.sourceDir().clear();
+
+        op = op.sourceDir(foo, bar);
+        assertThat(op.sourceDir()).as("File...").hasSize(2).contains(foo, bar);
+        op.sourceDir().clear();
+
+        op = op.sourceDir(List.of(foo, bar));
+        assertThat(op.sourceDir()).as("List(File...)").hasSize(2).contains(foo, bar);
+        op.sourceDir().clear();
+
+        op = op.sourceDir(foo.toPath(), bar.toPath());
+        assertThat(op.sourceDir()).as("Path...").hasSize(2).contains(foo, bar);
+        op.sourceDir().clear();
+
+        op = op.sourceDirPaths(List.of(foo.toPath(), bar.toPath()));
+        assertThat(op.sourceDir()).as("List(Path...)").hasSize(2).contains(foo, bar);
+        op.sourceDir().clear();
+    }
+
+
+    @Test
+    void suppressionLineColumnNumber() {
+        var op = new CheckstyleOperation().fromProject(new Project()).suppressionLineColumnNumber(FOO + ':' + BAR);
+        assertThat(op.options().get("-s")).isEqualTo(FOO + ':' + BAR);
+    }
+
+    @Test
+    void tabWith() {
+        var op = new CheckstyleOperation().fromProject(new Project()).tabWith(9);
+        assertThat(op.options().get("-w")).isEqualTo("9");
+    }
+
+    @Test
+    void tree() {
+        var op = new CheckstyleOperation().fromProject(new Project()).tree(true);
+        assertThat(op.options().containsKey("-t")).as(ADD).isTrue();
+        op = op.tree(false);
+        assertThat(op.options().containsKey("-t")).as(REMOVE).isFalse();
+    }
+
+    @Test
+    void treeWithComments() {
+        var op = new CheckstyleOperation().fromProject(new Project()).treeWithComments(true);
+        assertThat(op.options().containsKey("-T")).as(ADD).isTrue();
+        op = op.treeWithComments(false);
+        assertThat(op.options().containsKey("-T")).as(REMOVE).isFalse();
+    }
+
+    @Test
+    void treeWithJavadoc() {
+        var op = new CheckstyleOperation().fromProject(new Project()).treeWithJavadoc(true);
+        assertThat(op.options().containsKey("-J")).as(ADD).isTrue();
+        op = op.treeWithJavadoc(false);
+        assertThat(op.options().containsKey("-J")).as(REMOVE).isFalse();
     }
 }
diff --git a/src/test/resources/checkstyle-args.txt b/src/test/resources/checkstyle-args.txt
index 56db2d3..fa76eaf 100644
--- a/src/test/resources/checkstyle-args.txt
+++ b/src/test/resources/checkstyle-args.txt
@@ -5,7 +5,6 @@
 -E
 -f
 -g
--G
 -j
 -J
 -o