diff --git a/tests/src/lib.rs b/tests/src/lib.rs
index 3368dc49b..024ac8cc7 100644
--- a/tests/src/lib.rs
+++ b/tests/src/lib.rs
@@ -15,7 +15,7 @@ pub use backend::MockLLMBackend;
 pub use bus::MockAgentBus;
 pub use clock::{Clock, MockClock, SystemClock};
 pub use report::{
-    JsonFormatter, ReportFormatter, TestCaseResult, TestReport, TestReportBuilder, TestStatus,
-    TextFormatter,
+    JUnitFormatter, JsonFormatter, ReportFormatter, TestCaseResult, TestReport, TestReportBuilder,
+    TestStatus, TextFormatter,
 };
 pub use tools::MockTool;
diff --git a/tests/src/report/format.rs b/tests/src/report/format.rs
index 919cae59d..640ab41dd 100644
--- a/tests/src/report/format.rs
+++ b/tests/src/report/format.rs
@@ -7,6 +7,15 @@ pub trait ReportFormatter: Send + Sync {
     fn format(&self, report: &TestReport) -> String;
 }
 
+fn escape_xml(input: &str) -> String {
+    input
+        .replace('&', "&")
+        .replace('<', "&lt;")
+        .replace('>', "&gt;")
+        .replace('"', "&quot;")
+        .replace('\'', "&apos;")
+}
+
 /// Renders a report as a JSON object.
 pub struct JsonFormatter;
 
@@ -102,3 +111,95 @@ impl ReportFormatter for TextFormatter {
         buf
     }
 }
+
+/// Renders a report as a JUnit XML testsuite.
+pub struct JUnitFormatter;
+
+impl ReportFormatter for JUnitFormatter {
+    fn format(&self, report: &TestReport) -> String {
+        let mut buf = String::new();
+        let tests = report.total();
+        let failures = report.failed();
+        let skipped = report.skipped();
+        let time_secs = report.total_duration.as_secs_f64();
+
+        buf.push_str("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
+        buf.push_str(&format!(
+            "<testsuite name=\"{}\" tests=\"{}\" failures=\"{}\" skipped=\"{}\" time=\"{:.3}\" timestamp=\"{}\">\n",
+            escape_xml(&report.suite_name),
+            tests,
+            failures,
+            skipped,
+            time_secs,
+            report.timestamp
+        ));
+
+        for result in &report.results {
+            buf.push_str(&format!(
+                "  <testcase name=\"{}\" time=\"{:.3}\">",
+                escape_xml(&result.name),
+                result.duration.as_secs_f64()
+            ));
+
+            match result.status {
+                TestStatus::Passed => {
+                    if !result.metadata.is_empty() {
+                        buf.push('\n');
+                        buf.push_str("    <properties>\n");
+                        for (key, value) in &result.metadata {
+                            buf.push_str(&format!(
+                                "      <property name=\"{}\" value=\"{}\"/>\n",
+                                escape_xml(key),
+                                escape_xml(value)
+                            ));
+                        }
+                        buf.push_str("    </properties>\n");
+                        buf.push_str("  </testcase>\n");
+                    } else {
+                        buf.push_str("</testcase>\n");
+                    }
+                }
+                TestStatus::Failed => {
+                    buf.push('\n');
+                    if !result.metadata.is_empty() {
+                        buf.push_str("    <properties>\n");
+                        for (key, value) in &result.metadata {
+                            buf.push_str(&format!(
+                                "      <property name=\"{}\" value=\"{}\"/>\n",
+                                escape_xml(key),
+                                escape_xml(value)
+                            ));
+                        }
+                        buf.push_str("    </properties>\n");
+                    }
+                    let message = result.error.as_deref().unwrap_or("test failed");
+                    buf.push_str(&format!(
+                        "    <failure message=\"{}\">{}</failure>\n",
+                        escape_xml(message),
+                        escape_xml(message)
+                    ));
+                    buf.push_str("  </testcase>\n");
+                }
+                TestStatus::Skipped => {
+                    buf.push('\n');
+                    if !result.metadata.is_empty() {
+                        buf.push_str("    <properties>\n");
+                        for (key, value) in &result.metadata {
+                            buf.push_str(&format!(
+                                "      <property name=\"{}\" value=\"{}\"/>\n",
+                                escape_xml(key),
+                                escape_xml(value)
+                            ));
+                        }
+                        buf.push_str("    </properties>\n");
+                    }
+                    buf.push_str("    <skipped/>\n");
+                    buf.push_str("  </testcase>\n");
+                }
+            }
+        }
+
+        buf.push_str("</testsuite>\n");
+        buf
+    }
+}
diff --git a/tests/src/report/mod.rs b/tests/src/report/mod.rs
index c869a86fd..444dbbdde 100644
--- a/tests/src/report/mod.rs
+++ b/tests/src/report/mod.rs
@@ -5,5 +5,5 @@ mod format;
 mod types;
 
 pub use builder::TestReportBuilder;
-pub use format::{JsonFormatter, ReportFormatter, TextFormatter};
+pub use format::{JUnitFormatter, JsonFormatter, ReportFormatter, TextFormatter};
 pub use types::{TestCaseResult, TestReport, TestStatus};
diff --git a/tests/tests/report_tests.rs b/tests/tests/report_tests.rs
index d52a9e9fa..4f46e16fc 100644
--- a/tests/tests/report_tests.rs
+++ b/tests/tests/report_tests.rs
@@ -2,8 +2,8 @@ use std::sync::Arc;
 use std::time::Duration;
 
 use mofa_testing::{
-    JsonFormatter, MockClock, ReportFormatter, TestCaseResult, TestReport, TestReportBuilder,
-    TestStatus, TextFormatter,
+    JUnitFormatter, JsonFormatter, MockClock, ReportFormatter, TestCaseResult, TestReport,
+    TestReportBuilder, TestStatus, TextFormatter,
 };
 
 // ---------------------------------------------------------------------------
@@ -319,3 +319,83 @@ fn text_formatter_empty_report() {
     assert!(output.contains("Total: 0"));
     assert!(output.contains("Pass rate: 100.0%"));
 }
+
+// ===========================================================================
+// JUnitFormatter
+// ===========================================================================
+
+#[test]
+fn junit_formatter_all_passing_suite() {
+    let report = TestReport {
+        suite_name: "passing".into(),
+        results: vec![
+            make_result("alpha", TestStatus::Passed, 10, None),
+            make_result("beta", TestStatus::Passed, 20, None),
+        ],
+        total_duration: Duration::from_millis(30),
+        timestamp: 123,
+    };
+
+    let output = JUnitFormatter.format(&report);
+    assert!(output.contains("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"));
+    assert!(output.contains("<testsuite name=\"passing\" tests=\"2\" failures=\"0\" skipped=\"0\" time=\"0.030\" timestamp=\"123\">"));
+    assert!(output.contains("<testcase name=\"alpha\" time=\"0.010\"></testcase>"));
+    assert!(output.contains("<testcase name=\"beta\" time=\"0.020\"></testcase>"));
+}
+
+#[test]
+fn junit_formatter_mixed_status_suite() {
+    let report = mixed_report();
+    let output = JUnitFormatter.format(&report);
+
+    assert!(output.contains("<testsuite name=\"mixed\" tests=\"5\" failures=\"2\" skipped=\"1\" time=\"0.110\" timestamp=\"1000\">"));
+    assert!(output.contains("<failure message=\"boom\">boom</failure>"));
+    assert!(output.contains("<failure message=\"oops\">oops</failure>"));
+    assert!(output.contains("<skipped/>"));
+}
+
+#[test]
+fn junit_formatter_escapes_error_payload() {
+    let report = TestReport {
+        suite_name: "xml".into(),
+        results: vec![make_result(
+            "needs<escape>",
+            TestStatus::Failed,
+            1,
+            Some("bad <xml> & \"quotes\""),
+        )],
+        total_duration: Duration::from_millis(1),
+        timestamp: 1,
+    };
+
+    let output = JUnitFormatter.format(&report);
+    assert!(output.contains("name=\"needs&lt;escape&gt;\""));
+    assert!(output.contains("message=\"bad &lt;xml&gt; &amp; &quot;quotes&quot;\""));
+    assert!(output.contains(">bad &lt;xml&gt; &amp; &quot;quotes&quot;</failure>"));
+}
+
+#[test]
+fn junit_formatter_includes_metadata_as_properties() {
+    let mut tc = make_result("meta_case", TestStatus::Passed, 5, None);
+    tc.metadata.push(("browser".into(), "webkit".into()));
+    tc.metadata.push(("env".into(), "ci".into()));
+    let report = TestReport {
+        suite_name: "meta".into(),
+        results: vec![tc],
+        total_duration: Duration::from_millis(5),
+        timestamp: 9,
+    };
+
+    let output = JUnitFormatter.format(&report);
+    assert!(output.contains("<properties>"));
+    assert!(output.contains("<property name=\"browser\" value=\"webkit\"/>"));
+    assert!(output.contains("<property name=\"env\" value=\"ci\"/>"));
+}
+
+#[test]
+fn junit_formatter_is_deterministic() {
+    let report = mixed_report();
+    let first = JUnitFormatter.format(&report);
+    let second = JUnitFormatter.format(&report);
+    assert_eq!(first, second);
+}