Add OS matrix for Ubuntu, Windows and macOS

.github/workflows/bld.yml

@@ -4,11 +4,13 @@ on: [push, pull_request, workflow_dispatch]
 
 jobs:
   build-bld-project:
-    runs-on: ubuntu-latest
-
     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 }}
 
     steps:
       - name: Checkout source repository
@@ -22,6 +24,14 @@ jobs:
           distribution: "zulu"
           java-version: ${{ matrix.java-version }}
 
+      - name: Download dependencies [examples]
+        working-directory: examples
+        run: ./bld download
+
+      - name: Run PIT tests [examples]
+        working-directory: examples
+        run: ./bld compile pit
+
       - name: Download dependencies
         run: ./bld download
 

src/bld/java/rife/bld/extension/PitestOperationBuild.java

@@ -108,10 +108,13 @@ public class PitestOperationBuild extends Project {
 
     @Override
     public void test() throws Exception {
+        var os = System.getProperty("os.name");
+        if (os != null && os.toLowerCase().contains("linux")) {
             new ExecOperation()
                     .fromProject(this)
                     .command("scripts/cliargs.sh")
                     .execute();
+        }
         super.test();
     }
 }

src/main/java/rife/bld/extension/PitestOperation.java

@@ -432,9 +432,9 @@ public class PitestOperation extends AbstractProcessOperation<PitestOperation> {
         if (project_ != null) {
             args.add(javaTool());
             args.add("-cp");
-            args.add(String.format("%s:%s:%s:%s", new File(project_.libTestDirectory(), "*"),
+            args.add(String.format("%s%s%s%s%s%s%s", new File(project_.libTestDirectory(), "*"), File.pathSeparator,
-                    new File(project_.libCompileDirectory(), "*"), project_.buildMainDirectory(),
+                    new File(project_.libCompileDirectory(), "*"), File.pathSeparator, project_.buildMainDirectory(),
-                    project_.buildTestDirectory()));
+                    File.pathSeparator, project_.buildTestDirectory()));
             args.add("org.pitest.mutationtest.commandline.MutationCoverageReport");
 
             if (!options_.containsKey(SOURCE_DIRS)) {

src/test/java/rife/bld/extension/PitestOperationTest.java

@@ -18,6 +18,8 @@ package rife.bld.extension;
 
 import org.assertj.core.api.AutoCloseableSoftAssertions;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.EnabledOnOs;
+import org.junit.jupiter.api.condition.OS;
 import rife.bld.BaseProject;
 import rife.bld.Project;
 import rife.bld.WebProject;
@@ -64,6 +66,7 @@ class PitestOperationTest {
     }
 
     @Test
+    @EnabledOnOs(OS.LINUX)
     void checkAllParameters() throws IOException {
         var args = Files.readAllLines(Paths.get("src", "test", "resources", "pitest-args.txt"));