Revive test suite on Windows

Jenkinsfile

@@ -6,7 +6,5 @@ buildPlugin(
   useContainerAgent: false, // Set to `false` if you need to use Docker for containerized tests
   configurations: [
     [platform: 'linux', jdk: 21],
-    [platform: 'linux', jdk: 17],
-    // TODO Windows tests seem to be failing on temporary Windows CI infrastructure from https://github.com/jenkins-infra/helpdesk/issues/4490
-    //[platform: 'maven-17-windows', jdk: 17], // TODO Docker-based tests fail when using Docker on Windows. The maven-windows agents do not have Docker installed so tests that require Docker are skipped.
+    [platform: 'windows', jdk: 17],
 ])

src/test/java/org/jenkinsci/plugins/docker/workflow/DockerDSLTest.java

@@ -270,7 +270,7 @@ private static void grep(File dir, String text, String prefix, Set<String> match
     @Test public void buildWithMultiStage() {
         story.addStep(new Statement() {
             @Override public void evaluate() throws Throwable {
-                assumeDocker(new VersionNumber("17.05"));
+                assumeDocker(DockerTestUtil.DockerOsMode.LINUX, new VersionNumber("17.05"));
                 WorkflowJob p = story.j.jenkins.createProject(WorkflowJob.class, "prj");
                 p.setDefinition(new CpsFlowDefinition(
                         "node {\n" +

src/test/java/org/jenkinsci/plugins/docker/workflow/DockerTestUtil.java

@@ -31,6 +31,7 @@
 import org.junit.Assume;
 
 import java.io.ByteArrayOutputStream;
+import java.io.File;
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.List;
@@ -39,7 +40,6 @@
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
-import org.hamcrest.Matchers;
 import org.jenkinsci.plugins.docker.commons.tools.DockerTool;
 
 /**
@@ -58,33 +58,20 @@ public class DockerTestUtil {
         "10.0.26100.2605"  // 2025
     );
 
+    public enum DockerOsMode {
+        LINUX,
+        WINDOWS
+    }
 
     public static void assumeDocker() throws Exception {
-        assumeDocker(new VersionNumber(DEFAULT_MINIMUM_VERSION));
+        assumeDocker(DockerOsMode.LINUX, new VersionNumber(DEFAULT_MINIMUM_VERSION));
     }
-
-    public static void assumeDocker(VersionNumber minimumVersion) throws Exception {
-        Launcher.LocalLauncher localLauncher = new Launcher.LocalLauncher(StreamTaskListener.NULL);
-        try {
-            int status = localLauncher
-                .launch()
-                .cmds(DockerTool.getExecutable(null, null, null, null), "ps")
-                .start()
-                .joinWithTimeout(DockerClient.CLIENT_TIMEOUT, TimeUnit.SECONDS, localLauncher.getListener());
-            Assume.assumeTrue("Docker working", status == 0);
-        } catch (IOException x) {
-            Assume.assumeNoException("have Docker installed", x);
-        }
-        DockerClient dockerClient = new DockerClient(localLauncher, null, null);
-        Assume.assumeFalse("Docker version not < " + minimumVersion.toString(), dockerClient.version().isOlderThan(minimumVersion));
+
+    public static void assumeDocker(DockerOsMode osMode) throws Exception {
+        assumeDocker(osMode, new VersionNumber(DEFAULT_MINIMUM_VERSION));
     }
 
-    /**
-      * Used to assume docker Windows is running in a particular os mode
-      * @param os The os [windows, linux]
-      * @throws Exception
-      */
-    public static void assumeDockerServerOSMode(String os) throws Exception {
+    public static void assumeDocker(DockerOsMode osMode, VersionNumber minimumVersion) throws Exception {
         Launcher.LocalLauncher localLauncher = new Launcher.LocalLauncher(StreamTaskListener.NULL);
         try {
             ByteArrayOutputStream out = new ByteArrayOutputStream();
@@ -94,11 +81,14 @@ public static void assumeDockerServerOSMode(String os) throws Exception {
                 .stdout(out)
                 .start()
                 .joinWithTimeout(DockerClient.CLIENT_TIMEOUT, TimeUnit.SECONDS, localLauncher.getListener());
+            DockerOsMode cmdOsMode = DockerOsMode.valueOf(out.toString().trim().toUpperCase());
             Assume.assumeTrue("Docker working", status == 0);
-            Assume.assumeThat("Docker running in " + os + " mode", out.toString().trim(), Matchers.equalToIgnoringCase(os));
+            Assume.assumeTrue("Docker os mode " + osMode, osMode == cmdOsMode);
         } catch (IOException x) {
-            Assume.assumeNoException("Docker retrieve OS", x);
+            Assume.assumeNoException("have Docker installed", x);
         }
+        DockerClient dockerClient = new DockerClient(localLauncher, null, null);
+        Assume.assumeFalse("Docker version not < " + minimumVersion.toString(), dockerClient.version().isOlderThan(minimumVersion));
     }
 
     public static void assumeWindows() throws Exception {
@@ -109,6 +99,10 @@ public static void assumeNotWindows() throws Exception {
         Assume.assumeFalse(System.getProperty("os.name").toLowerCase().contains("windows"));
     }
 
+    public static void assumeDrive(char drive) throws Exception {
+        Assume.assumeTrue(new File(drive + ":/").exists());
+    }
+
     public static String getWindowsKernelVersion() throws Exception {
         Launcher.LocalLauncher localLauncher = new Launcher.LocalLauncher(StreamTaskListener.NULL);
         ByteArrayOutputStream out = new ByteArrayOutputStream();

src/test/java/org/jenkinsci/plugins/docker/workflow/WithContainerStepTest.java

@@ -299,7 +299,7 @@ public class WithContainerStepTest {
     @Test public void cd() throws Exception {
         story.addStep(new Statement() {
             @Override public void evaluate() throws Throwable {
-                DockerTestUtil.assumeDocker(new VersionNumber("17.12"));
+                DockerTestUtil.assumeDocker(DockerTestUtil.DockerOsMode.LINUX, new VersionNumber("17.12"));
                 WorkflowJob p = story.j.jenkins.createProject(WorkflowJob.class, "prj");
                 p.setDefinition(new CpsFlowDefinition(
                     "node {\n" +
@@ -498,8 +498,7 @@ private static final class Execution extends SynchronousNonBlockingStepExecution
         story.addStep(new Statement() {
             @Override public void evaluate() throws Throwable {
                 DockerTestUtil.assumeWindows();
-                DockerTestUtil.assumeDocker();
-                DockerTestUtil.assumeDockerServerOSMode("windows");
+                DockerTestUtil.assumeDocker(DockerTestUtil.DockerOsMode.WINDOWS);
 
                 // Kernel must match when running Windows containers on docker on Windows
                 String releaseTag = DockerTestUtil.getWindowsImageTag();

src/test/java/org/jenkinsci/plugins/docker/workflow/client/WindowsDockerClientTest.java

@@ -10,25 +10,23 @@
 import org.junit.Before;
 import org.junit.Test;
 
-import java.io.IOException;
 import java.util.Collections;
 
 public class WindowsDockerClientTest {
 
     private DockerClient dockerClient;
 
     @Before
-    public void setup() throws Exception {
-        DockerTestUtil.assumeDocker();
-
+    public void setup() {
         TaskListener taskListener = StreamTaskListener.fromStderr();
         Launcher.LocalLauncher launcher = new Launcher.LocalLauncher(taskListener);
 
         dockerClient = new WindowsDockerClient(launcher, null, null);
     }
 
     @Test
-    public void test_run() throws IOException, InterruptedException {
+    public void test_run() throws Exception {
+        DockerTestUtil.assumeDocker();
         EnvVars launchEnv = DockerTestUtil.newDockerLaunchEnv();
         String containerId = dockerClient.run(
             launchEnv,