Copilot commented on code in PR #4738:
URL: https://github.com/apache/solr/pull/4738#discussion_r3780000778


##########
solr/webapp/src/test/org/apache/solr/webapp/AdminUiTestBase.java:
##########
@@ -0,0 +1,533 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.solr.webapp;
+
+import com.carrotsearch.randomizedtesting.ThreadFilter;
+import com.carrotsearch.randomizedtesting.annotations.ThreadLeakFilters;
+import com.carrotsearch.randomizedtesting.annotations.ThreadLeakLingering;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import java.io.File;
+import java.io.IOException;
+import java.lang.invoke.MethodHandles;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.time.Duration;
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.BooleanSupplier;
+import java.util.function.Function;
+import java.util.logging.Level;
+import org.apache.lucene.tests.util.QuickPatchThreadsFilter;
+import org.apache.lucene.util.SuppressForbidden;
+import org.apache.solr.SolrIgnoredThreadsFilter;
+import org.apache.solr.SolrTestCaseJ4;
+import org.apache.solr.client.solrj.SolrClient;
+import org.apache.solr.client.solrj.SolrRequest;
+import org.apache.solr.client.solrj.SolrServerException;
+import org.apache.solr.client.solrj.request.CollectionAdminRequest;
+import org.apache.solr.client.solrj.request.GenericSolrRequest;
+import org.apache.solr.cloud.SolrCloudTestCase;
+import org.apache.solr.common.params.SolrParams;
+import org.apache.solr.common.util.NamedList;
+import org.apache.solr.embedded.JettyConfig;
+import org.apache.solr.embedded.JettySolrRunner;
+import org.apache.solr.util.ExternalPaths;
+import org.eclipse.jetty.ee10.servlet.ServletHolder;
+import org.junit.AfterClass;
+import org.junit.Assume;
+import org.junit.BeforeClass;
+import org.junit.Rule;
+import org.junit.rules.TestRule;
+import org.junit.rules.TestWatcher;
+import org.junit.runner.Description;
+import org.openqa.selenium.By;
+import org.openqa.selenium.NoSuchElementException;
+import org.openqa.selenium.OutputType;
+import org.openqa.selenium.StaleElementReferenceException;
+import org.openqa.selenium.TakesScreenshot;
+import org.openqa.selenium.WebDriver;
+import org.openqa.selenium.WebDriverException;
+import org.openqa.selenium.WebElement;
+import org.openqa.selenium.chrome.ChromeDriver;
+import org.openqa.selenium.chrome.ChromeOptions;
+import org.openqa.selenium.logging.LogEntry;
+import org.openqa.selenium.logging.LogType;
+import org.openqa.selenium.logging.LoggingPreferences;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Base class for browser-based tests of the AngularJS Admin UI.
+ *
+ * <p>Starts a {@link SolrCloudTestCase} mini-cluster whose Jetty nodes also 
serve the Admin UI
+ * static files (see {@code JettyConfig.Builder#enableAdminUi(boolean)}), then 
drives the UI with a
+ * headless Chrome via Selenium WebDriver.
+ *
+ * <p>The tests require a locally installed Chrome/Chromium browser. Discovery 
order: the {@code
+ * tests.ui.chrome.binary} system property, the {@code CHROME_BIN} environment 
variable, then a list
+ * of well-known install locations. When no browser is found, all tests in the 
class are skipped via
+ * {@link Assume}. The matching chromedriver is provisioned by Selenium 
Manager, which may download
+ * it on first use (cached under {@code ~/.cache/selenium}); if that fails 
(e.g. offline), tests are
+ * likewise skipped.
+ */
[email protected](bugUrl = "Admin UI browser tests drive plain http")
+@ThreadLeakFilters(
+    defaultFilters = true,
+    filters = {
+      SolrIgnoredThreadsFilter.class,
+      QuickPatchThreadsFilter.class,
+      AdminUiTestBase.WebDriverThreadsFilter.class
+    })
+@ThreadLeakLingering(linger = 5000)
+public abstract class AdminUiTestBase extends SolrCloudTestCase {
+
+  private static final Logger log = 
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+
+  protected static final Duration WAIT_TIMEOUT = Duration.ofSeconds(15);
+
+  protected static WebDriver driver;
+
+  /** Base url of the first node, e.g. {@code http://127.0.0.1:PORT/solr} */
+  protected static String baseUrl;
+
+  /**
+   * Optional security.json for the cluster. Subclasses assign this in their 
{@code @BeforeClass}
+   * (which runs after this class's browser-starting one, but before the 
cluster starts lazily on
+   * first use). Never assign it in a {@code static} block: test runners may 
load all test classes
+   * up front, so static initializers of one class can run long before its 
suite executes.
+   */
+  protected static String securityJson;
+
+  /**
+   * When true (set by {@code AdminUiStandaloneTestBase}), no cloud cluster is 
started; the test
+   * class starts its own standalone {@link JettySolrRunner}(s), assigns 
{@link #standaloneJetty}
+   * and {@link #baseUrl}, and stops them again.
+   */
+  protected static boolean standaloneMode = false;
+
+  /** The standalone node backing {@link #adminApi} when {@link 
#standaloneMode} is set. */
+  protected static JettySolrRunner standaloneJetty;
+
+  /**
+   * Serves a minimal stand-in for the generated js-client bundle ({@code 
libs/solr/index.js}),
+   * which only exists inside the built webapp, not in the source tree tests 
serve from. The
+   * AngularJS {@code CollectionsV2} service fails to instantiate without the 
{@code solrApi}
+   * global, taking the whole Collections screen down with it. Only the small 
API surface the
+   * AngularJS UI actually uses is stubbed.
+   */
+  public static class StubJsClientServlet extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) 
throws IOException {
+      resp.setContentType("text/javascript");
+      resp.getOutputStream()
+          .write(
+              ("var solrApi = {\n"
+                      + "  ApiClient: { instance: { basePath: '/api', 
defaultHeaders: {} } },\n"
+                      + "  CollectionsApi: function() {\n"
+                      + "    this.reloadCollection = function(name, callback) 
{\n"
+                      + "      var xhr = new XMLHttpRequest();\n"
+                      + "      xhr.open('POST', '/api/collections/' + name + 
'/reload');\n"
+                      + "      xhr.setRequestHeader('Content-Type', 
'application/json');\n"
+                      + "      xhr.onload = function() { callback(null, null, 
{status: xhr.status}); };\n"
+                      + "      xhr.onerror = function() { callback(new 
Error('reload failed'), null, {status: xhr.status}); };\n"
+                      + "      xhr.send('{}');\n"
+                      + "    };\n"
+                      + "  }\n"
+                      + "};\n")
+                  .getBytes(StandardCharsets.UTF_8));
+    }
+  }
+
+  /** Ignores threads spawned by Selenium and the JDK http client it uses. */
+  public static class WebDriverThreadsFilter implements ThreadFilter {
+    @Override
+    public boolean reject(Thread t) {
+      String name = t.getName();
+      // JDK java.net.http client worker/selector threads (used by Selenium) 
are daemon
+      // threads in a shared pool that outlive WebDriver.quit()
+      return name.startsWith("HttpClient-")
+          // reaps the external chromedriver/chrome processes
+          || name.startsWith("process reaper")
+          // selenium driver-service startup checker pool, terminates on its 
own
+          || name.startsWith("UrlChecker-")
+          // selenium's chromedriver stdout/stderr pump, stops when the 
process exits
+          || name.startsWith("External Process Output Forwarder")
+          // JDK-internal scheduler backing CompletableFuture timeouts, lives 
forever
+          || name.equals("CompletableFutureDelayScheduler");
+    }
+  }
+
+  @BeforeClass
+  @SuppressForbidden(reason = "Selenium's logging preferences API uses 
java.util.logging levels")
+  public static void startClusterAndBrowser() throws Exception {
+    Path chrome = findChromeBinary();
+    Assume.assumeTrue(
+        "No Chrome/Chromium binary found (set -Dtests.ui.chrome.binary=...), 
skipping UI tests",
+        chrome != null);
+
+    // metrics are off by default in test clusters, but UI screens (e.g. 
Plugins) need them;
+    // restored after the class by SolrTestCase's SystemPropertiesRestoreRule
+    System.setProperty("metricsEnabled", "true");
+    // the cluster starts lazily via ensureCloudCluster(), after subclass 
@BeforeClass
+    // methods have had the chance to configure securityJson or standalone mode
+
+    ChromeOptions options = new ChromeOptions();
+    options.setBinary(chrome.toString());
+    options.addArguments(
+        "--headless=new",
+        "--window-size=1440,1024",
+        "--disable-gpu",
+        "--no-sandbox",
+        "--disable-dev-shm-usage");
+    LoggingPreferences logPrefs = new LoggingPreferences();
+    logPrefs.enable(LogType.BROWSER, Level.ALL);
+    options.setCapability("goog:loggingPrefs", logPrefs);
+    try {
+      driver = new ChromeDriver(options);
+    } catch (WebDriverException e) {
+      Assume.assumeNoException(
+          "Could not start ChromeDriver (chromedriver missing and not 
downloadable?)", e);
+    }
+    driver.manage().timeouts().pageLoadTimeout(Duration.ofSeconds(30));
+  }
+
+  /** Starts the 2-node cloud cluster serving the UI, unless already started. 
*/
+  protected static void ensureCloudCluster() {
+    if (standaloneMode || cluster != null) {
+      return;
+    }
+    try {
+      var clusterBuilder =
+          
configureCluster(2).withJettyConfig(AdminUiTestBase::configureJettyForUi);
+      if (securityJson != null) {
+        clusterBuilder.withSecurityJson(securityJson);
+      }
+      clusterBuilder.configure();
+      baseUrl = cluster.getJettySolrRunner(0).getBaseUrl().toString();
+    } catch (Exception e) {
+      throw new RuntimeException("Could not start UI test cluster", e);
+    }
+  }
+
+  /** Configures a Jetty node to serve the Admin UI plus the js-client stub. */
+  protected static void configureJettyForUi(JettyConfig.Builder jetty) {
+    jetty
+        .enableAdminUi(true)
+        // exact-path mapping takes precedence over the static /libs/* servlet
+        .withServlet(new ServletHolder(new StubJsClientServlet()), 
"/libs/solr/index.js");
+  }
+
+  @AfterClass
+  public static void stopBrowser() {
+    // reset the static per-class configuration: several test classes run in 
the same
+    // JVM, and flags set by one class's static initializer must not leak into 
the next
+    standaloneMode = false;
+    standaloneJetty = null;
+    securityJson = null;
+    if (driver != null) {
+      try {
+        driver.quit();
+      } finally {
+        driver = null;
+        baseUrl = null;
+      }
+    }
+  }
+
+  /** Captures a screenshot and the page source when a test fails, for 
post-mortem debugging. */
+  @Rule
+  public final TestRule screenshotOnFailure =
+      new TestWatcher() {
+        @Override
+        protected void failed(Throwable e, Description description) {
+          if (driver == null) return;
+          try {
+            Path dir = createTempDir("ui-failure-" + 
description.getMethodName());
+            byte[] png = ((TakesScreenshot) 
driver).getScreenshotAs(OutputType.BYTES);
+            Files.write(dir.resolve("screenshot.png"), png);
+            Files.writeString(dir.resolve("page.html"), 
driver.getPageSource());
+            StringBuilder console = new StringBuilder();
+            for (LogEntry entry : 
driver.manage().logs().get(LogType.BROWSER).getAll()) {
+              console.append(entry.getLevel()).append(' 
').append(entry.getMessage()).append('\n');
+            }
+            Files.writeString(dir.resolve("console.log"), console.toString());
+            log.error("UI test failure artifacts saved to {}", dir);
+          } catch (Exception suppressed) {
+            log.warn("Could not save UI failure artifacts", suppressed);
+          }
+        }
+      };
+
+  /**
+   * Navigates to an Admin UI page and waits for a screen-specific anchor 
element to be visible.
+   *
+   * @param route the Angular hash route without leading {@code #/}, e.g. 
{@code ""} (dashboard),
+   *     {@code "~cloud"} or {@code "collection1/query"}
+   * @param anchor a locator for an element that indicates the screen has 
rendered
+   * @return the anchor element
+   */
+  protected static WebElement openPage(String route, By anchor) {
+    ensureCloudCluster();
+    driver.get(baseUrl + "/index.html#/" + route);
+    return waitFor(anchor);
+  }
+
+  /** Waits for the given element to be visible, up to {@link #WAIT_TIMEOUT}. 
*/
+  protected static WebElement waitFor(By locator) {
+    return poll(locator, el -> el.isDisplayed() ? el : null, "visible 
element");
+  }
+
+  /** Waits until the given element has non-blank text, and returns the text. 
*/
+  protected static String waitForText(By locator) {
+    return poll(
+        locator,
+        el -> {
+          String text = el.getText();
+          return el.isDisplayed() && !text.isBlank() ? text : null;
+        },
+        "non-empty text");
+  }
+
+  /**
+   * Polls the given element until {@code condition} returns non-null (a fresh 
lookup each round, so
+   * elements replaced by Angular re-renders are tolerated), failing after 
{@link #WAIT_TIMEOUT}.
+   */
+  private static <T> T poll(By locator, Function<WebElement, T> condition, 
String description) {
+    long deadlineNanos = System.nanoTime() + WAIT_TIMEOUT.toNanos();
+    WebDriverException lastException = null;
+    while (System.nanoTime() < deadlineNanos) {
+      try {
+        T result = condition.apply(driver.findElement(locator));
+        if (result != null) {
+          return result;
+        }
+        lastException = null;
+      } catch (NoSuchElementException | StaleElementReferenceException e) {
+        lastException = e;
+      }
+      try {
+        Thread.sleep(200);
+      } catch (InterruptedException e) {
+        Thread.currentThread().interrupt();
+        break;
+      }
+    }
+    throw new AssertionError(
+        "Timed out waiting for " + description + " at " + locator, 
lastException);
+  }
+
+  /**
+   * Issues a GET request to the given admin path (e.g. {@code 
/admin/info/system}) on the same node
+   * the browser talks to, and returns the parsed response. Used to fetch the 
expected values that
+   * the UI should display.
+   */
+  protected static NamedList<Object> adminApi(String path, SolrParams params)
+      throws IOException, SolrServerException {
+    ensureCloudCluster();
+    JettySolrRunner jetty = standaloneMode ? standaloneJetty : 
cluster.getJettySolrRunner(0);
+    try (SolrClient client = jetty.newClient()) {
+      return client.request(new GenericSolrRequest(SolrRequest.METHOD.GET, 
path, params));
+    }
+  }
+
+  /**
+   * Uploads the default configset under the collection's name and creates the 
collection. A
+   * single-replica collection is pinned to the node the browser talks to, so 
core-level screens
+   * find its core locally.
+   */
+  protected static void createFixtureCollection(String name, int numShards, 
int numReplicas)
+      throws Exception {
+    ensureCloudCluster();
+    cluster.uploadConfigSet(ExternalPaths.DEFAULT_CONFIGSET, name);
+    CollectionAdminRequest.Create create =
+        CollectionAdminRequest.createCollection(name, name, numShards, 
numReplicas);
+    if (numShards * numReplicas == 1) {
+      create.setCreateNodeSet(cluster.getJettySolrRunner(0).getNodeName());
+    }
+    create.process(cluster.getSolrClient());
+    cluster.waitForActiveCollection(name, numShards, numShards * numReplicas);
+  }
+
+  /** Polls the condition until it holds, failing after {@link #WAIT_TIMEOUT}. 
*/
+  protected static void waitUntil(String description, BooleanSupplier 
condition)
+      throws InterruptedException {
+    long deadlineNanos = System.nanoTime() + WAIT_TIMEOUT.toNanos();
+    while (System.nanoTime() < deadlineNanos) {
+      if (condition.getAsBoolean()) {
+        return;
+      }
+      Thread.sleep(250);
+    }
+    fail("Timed out waiting until " + description);
+  }
+
+  /** Returns the name of a core of the given collection hosted on node 0. */
+  protected static String coreNameOnNode0(String collection) {
+    for (String name : 
cluster.getJettySolrRunner(0).getCoreContainer().getAllCoreNames()) {
+      if (name.startsWith(collection + "_")) {
+        return name;
+      }
+    }
+    throw new AssertionError("No core found on node 0 for collection " + 
collection);
+  }
+
+  /**
+   * Clears the input at the locator and types the given text, retrying when 
Angular re-renders the
+   * element mid-interaction (StaleElementReferenceException).
+   */
+  protected static void setText(By locator, String text) {
+    poll(
+        locator,
+        el -> {
+          if (!el.isDisplayed()) {
+            return null;
+          }
+          el.clear();
+          el.sendKeys(text);
+          return Boolean.TRUE;
+        },
+        "typing '" + text + "'");
+  }
+
+  /** Waits until the element's rendered text contains the given substring, 
and returns it. */
+  protected static String waitForTextContains(By locator, String substring) {
+    return poll(
+        locator,
+        el -> {
+          String text = el.getText();
+          return text.contains(substring) ? text : null;
+        },
+        "text containing '" + substring + "'");
+  }
+
+  /** Waits until the page source contains the given text. */
+  protected static void waitForPageContains(String text) {
+    long deadlineNanos = System.nanoTime() + WAIT_TIMEOUT.toNanos();
+    while (System.nanoTime() < deadlineNanos) {
+      if (driver.getPageSource().contains(text)) {
+        return;
+      }
+      try {
+        Thread.sleep(200);
+      } catch (InterruptedException e) {
+        Thread.currentThread().interrupt();
+        break;
+      }
+    }
+    throw new AssertionError("Timed out waiting for page to contain: " + text);
+  }
+
+  /**
+   * Selects an option in a "chosen"-decorated select element. The original 
select is hidden by the
+   * widget, so this drives the generated container instead.
+   */
+  protected static void chosenSelect(String selectId, String optionText) {
+    WebElement container = waitFor(By.id(selectId + "_chosen"));
+    container.click();
+    long deadlineNanos = System.nanoTime() + WAIT_TIMEOUT.toNanos();
+    while (System.nanoTime() < deadlineNanos) {
+      for (WebElement option :
+          container.findElements(By.cssSelector(".chosen-results 
li.active-result"))) {
+        if (optionText.equals(option.getText())) {
+          option.click();
+          return;
+        }
+      }
+      try {
+        Thread.sleep(200);
+      } catch (InterruptedException e) {
+        Thread.currentThread().interrupt();
+        break;
+      }
+    }
+    throw new AssertionError("Option '" + optionText + "' not found in select 
" + selectId);
+  }
+
+  /**
+   * Fails the test if the browser console contains SEVERE errors, ignoring 
known-benign ones and
+   * any messages containing one of {@code allowedSubstrings}.
+   */
+  @SuppressForbidden(reason = "Selenium's log API reports java.util.logging 
levels")
+  protected static void assertNoSevereConsoleErrors(String... 
allowedSubstrings) {
+    List<LogEntry> entries = 
driver.manage().logs().get(LogType.BROWSER).getAll();
+    List<LogEntry> severe =
+        entries.stream()
+            .filter(entry -> entry.getLevel().intValue() >= 
Level.SEVERE.intValue())
+            .filter(
+                entry ->
+                    Arrays.stream(allowedSubstrings)
+                        .noneMatch(allowed -> 
entry.getMessage().contains(allowed)))
+            .filter(entry -> !entry.getMessage().contains("favicon.ico"))
+            // the ui-grid icon font referenced from ui-grid.min.css is not 
shipped with
+            // the webapp at all, so it 404s in production too
+            .filter(entry -> !entry.getMessage().contains("fonts/ui-grid"))
+            // benign race in the shared menu code: showCore() fires with a 
null core
+            // while the per-collection menu resolves after navigation
+            .filter(
+                entry ->
+                    !(entry.getMessage().contains("reading 'name'")
+                        && entry.getMessage().contains("showCore")))
+            .toList();
+    assertTrue("Severe browser console errors: " + severe, severe.isEmpty());
+  }
+
+  /** Locates a Chrome/Chromium binary, or returns null if none can be found. 
*/
+  @SuppressForbidden(reason = "Reading CHROME_BIN/PATH from the environment to 
locate a browser")
+  protected static Path findChromeBinary() {
+    String sysProp = System.getProperty("tests.ui.chrome.binary");

Review Comment:
   Use `EnvUtils` for system-property reads, as required by the Solr property 
convention. Reading directly through `System.getProperty` bypasses the standard 
`SOLR_*` environment-variable mapping.



##########
solr/webapp/src/test/org/apache/solr/webapp/AdminUiLoggingScreenTest.java:
##########
@@ -0,0 +1,117 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.solr.webapp;
+
+import java.lang.invoke.MethodHandles;
+import java.util.List;
+import java.util.Map;
+import org.apache.solr.common.util.NamedList;
+import org.junit.Assume;
+import org.junit.Test;
+import org.openqa.selenium.By;
+import org.openqa.selenium.WebElement;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/** Tests the Logging screens: the recent-events viewer and the log level 
editor. */
+public class AdminUiLoggingScreenTest extends AdminUiTestBase {
+
+  private static final Logger log = 
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+
+  @Test
+  public void testLoggingLevelTree() {
+    openPage("~logging/level", By.id("loggingtree"));
+    waitForPageContains("org.apache.solr");
+    waitFor(By.cssSelector("#loggingtree .jstree-anchor"));
+    assertNoSevereConsoleErrors();
+  }
+
+  @Test
+  public void testEventsViewerShowsWarnings() throws Exception {
+    // the cluster nodes run in this JVM, so the log watcher observes our own 
log events
+    String probeMessage = "Admin UI logging viewer probe event";
+    log.warn(probeMessage);

Review Comment:
   When this method is the first test in the class, the cluster is still lazy 
and no current node log watcher exists when the probe is emitted. The first 
`adminApi` call starts the cluster only afterward, so the probe cannot appear 
and this coverage is skipped solely because of randomized method order. Start 
the cluster before logging; the existing assumption can still handle the 
shared-appender limitation.



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