Skipping writing FILTERED tests to test.xml

This fixes #3201 by preventing tests that haven't actually run to be written to the test.xml. This is consistent with how e.g. surefire reports work, tests that were filtered out do not appear in the xml.
This allows changing the Bazel plugin in such a way that does not depend on `time` being 0.0.

Closes #4596.

PiperOrigin-RevId: 185810400
diff --git a/src/java_tools/junitrunner/java/com/google/testing/junit/runner/model/AntXmlResultWriter.java b/src/java_tools/junitrunner/java/com/google/testing/junit/runner/model/AntXmlResultWriter.java
index 8ee4ba3a..4c0e794 100644
--- a/src/java_tools/junitrunner/java/com/google/testing/junit/runner/model/AntXmlResultWriter.java
+++ b/src/java_tools/junitrunner/java/com/google/testing/junit/runner/model/AntXmlResultWriter.java
@@ -112,6 +112,9 @@
   private void writeTestCases(XmlWriter writer, TestResult result,
       Iterable<Throwable> parentFailures) throws IOException {
     for (TestResult child : result.getChildResults()) {
+      if (child.getStatus() == TestResult.Status.FILTERED) {
+        continue;
+      }
       if (child.getChildResults().isEmpty()) {
         writeTestCase(writer, child, parentFailures);
       }
diff --git a/src/java_tools/junitrunner/javatests/com/google/testing/junit/runner/model/AntXmlResultWriterTest.java b/src/java_tools/junitrunner/javatests/com/google/testing/junit/runner/model/AntXmlResultWriterTest.java
new file mode 100644
index 0000000..3b208388
--- /dev/null
+++ b/src/java_tools/junitrunner/javatests/com/google/testing/junit/runner/model/AntXmlResultWriterTest.java
@@ -0,0 +1,91 @@
+// Copyright 2018 The Bazel Authors. All Rights Reserved.
+//
+// Licensed 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 com.google.testing.junit.runner.model;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import java.io.IOException;
+import java.io.StringWriter;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.Description;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class AntXmlResultWriterTest {
+  private static final long NOW = 1;
+  private static TestSuiteNode root;
+  private static XmlWriter writer;
+  private static AntXmlResultWriter resultWriter;
+  private static StringWriter stringWriter;
+
+  @Before
+  public void before() {
+    stringWriter = new StringWriter();
+    writer = XmlWriter.createForTesting(stringWriter);
+    resultWriter = new AntXmlResultWriter();
+    root = new TestSuiteNode(Description.createSuiteDescription("root"));
+  }
+
+  @Test
+  public void allPassingTestCasesWritten() throws IOException {
+    TestSuiteNode parent = createTestSuite();
+    TestCaseNode test1 = createTestCase(parent);
+    TestCaseNode test2 = createTestCase(parent);
+    runToCompletion(test1);
+    runToCompletion(test2);
+
+    resultWriter.writeTestSuites(writer, root.getResult());
+    String resultXml = stringWriter.toString();
+    assertThat(resultXml).contains("<testcase name='testCase1'");
+    assertThat(resultXml).contains("<testcase name='testCase2'");
+  }
+
+  @Test
+  public void testFilteredCasesNotWritten() throws IOException {
+    TestSuiteNode parent = createTestSuite();
+    TestCaseNode test1 = createTestCase(parent);
+    runToCompletion(test1);
+
+    createTestCase(parent); // creates a test case that is FILTERED by default
+
+    resultWriter.writeTestSuites(writer, root.getResult());
+
+    String resultXml = stringWriter.toString();
+    assertThat(resultXml).contains("<testcase name='testCase1'");
+    assertThat(resultXml).doesNotContain("<testcase name='testCase2'");
+  }
+
+  private void runToCompletion(TestCaseNode test) {
+    test.started(NOW);
+    test.finished(NOW + 1);
+  }
+
+  private TestCaseNode createTestCase(TestSuiteNode parent) {
+    int idx = parent.getChildren().size() + 1;
+    TestCaseNode testCase =
+        new TestCaseNode(Description.createSuiteDescription("testCase" + idx), parent);
+    parent.addTestCase(testCase);
+    return testCase;
+  }
+
+  private TestSuiteNode createTestSuite() {
+    Description suite = Description.createSuiteDescription(TestCaseNodeTest.TestSuite.class);
+    TestSuiteNode parent = new TestSuiteNode(suite);
+    root.addTestSuite(parent);
+    return parent;
+  }
+}