diff --git a/Auto Run Docs/SpecKit-web-header-analyzer-Phase-06-Interactive-Report.md b/Auto Run Docs/SpecKit-web-header-analyzer-Phase-06-Interactive-Report.md
index 7d30165..1beb57a 100644
--- a/Auto Run Docs/SpecKit-web-header-analyzer-Phase-06-Interactive-Report.md	
+++ b/Auto Run Docs/SpecKit-web-header-analyzer-Phase-06-Interactive-Report.md	
@@ -39,7 +39,7 @@ ReportContainer
 ## Tasks
 
 - [x] T030 [US4] Write failing tests (TDD Red) in `frontend/src/__tests__/report/TestResultCard.test.tsx` (each severity level, expand/collapse, error indicator), `HopChainVisualisation.test.tsx` (render with sample hops), `ReportSearchBar.test.tsx` (filter simulation), `ReportExport.test.tsx` (export trigger), `SecurityAppliancesSummary.test.tsx` (render with sample appliances, empty state), `ReportContainer.test.tsx` (full report with mixed results)
-- [ ] T031 [P] [US4] Create `frontend/src/components/report/TestResultCard.tsx` — collapsible card per test result. Severity-coloured indicator (red=spam, amber=suspicious, green=clean per FR-09), header name, monospace value, analysis text. Failed tests show error indicator (FR-25). Expand/collapse with animation, keyboard accessible (NFR-02). Verify `TestResultCard.test.tsx` passes (TDD Green)
+- [x] T031 [P] [US4] Create `frontend/src/components/report/TestResultCard.tsx` — collapsible card per test result. Severity-coloured indicator (red=spam, amber=suspicious, green=clean per FR-09), header name, monospace value, analysis text. Failed tests show error indicator (FR-25). Expand/collapse with animation, keyboard accessible (NFR-02). Verify `TestResultCard.test.tsx` passes (TDD Green)
 - [ ] T032 [P] [US4] Create `frontend/src/components/report/HopChainVisualisation.tsx` — vertical flow diagram of mail server hop chain (FR-08): hostname, IP, timestamp, server version, connecting arrows. FontAwesome server/network icons. Responsive. Verify `HopChainVisualisation.test.tsx` passes (TDD Green)
 - [ ] T033 [P] [US4] Create `frontend/src/components/report/ReportSearchBar.tsx` — search/filter bar above report (FR-20). Filters by text match against test name, header name, or analysis text. Highlights matches, shows count. FontAwesome search icon, Escape to clear. Verify `ReportSearchBar.test.tsx` passes (TDD Green)
 - [ ] T034 [P] [US4] Create `frontend/src/components/report/ReportExport.tsx` — export as HTML (styled standalone page) or JSON (raw data) per FR-21. FontAwesome download icons, triggers browser download. Verify `ReportExport.test.tsx` passes (TDD Green)
diff --git a/frontend/src/components/report/TestResultCard.tsx b/frontend/src/components/report/TestResultCard.tsx
new file mode 100644
index 0000000..dbd7550
--- /dev/null
+++ b/frontend/src/components/report/TestResultCard.tsx
@@ -0,0 +1,129 @@
+"use client";
+
+import { useState } from "react";
+import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
+import {
+  faBan,
+  faCheck,
+  faCircleInfo,
+  faTriangleExclamation,
+  faChevronDown,
+} from "@fortawesome/free-solid-svg-icons";
+
+import type { TestResult, TestSeverity } from "../../types/analysis";
+
+const severityStyles: Record<
+  TestSeverity,
+  { label: string; className: string; icon: typeof faBan }
+> = {
+  spam: { label: "Spam", className: "text-spam border-spam/40", icon: faBan },
+  suspicious: {
+    label: "Suspicious",
+    className: "text-suspicious border-suspicious/40",
+    icon: faTriangleExclamation,
+  },
+  clean: { label: "Clean", className: "text-clean border-clean/40", icon: faCheck },
+  info: { label: "Info", className: "text-accent border-accent/40", icon: faCircleInfo },
+};
+
+const getErrorMessage = (result: TestResult): string => {
+  const message = result.error?.trim();
+  return message && message.length > 0 ? message : "Unknown failure.";
+};
+
+type TestResultCardProps = {
+  result: TestResult;
+};
+
+export default function TestResultCard({ result }: TestResultCardProps) {
+  const [isExpanded, setIsExpanded] = useState(false);
+  const severityStyle = severityStyles[result.severity];
+  const detailsId = `test-result-details-${result.testId}`;
+
+  const toggle = () => {
+    setIsExpanded((previous) => !previous);
+  };
+
+  const handleKeyDown = (event: React.KeyboardEvent<HTMLButtonElement>) => {
+    if (event.key === "Enter" || event.key === " ") {
+      event.preventDefault();
+      toggle();
+    }
+  };
+
+  return (
+    <article
+      data-testid={`test-result-${result.testId}`}
+      className="rounded-2xl border border-info/10 bg-surface/50 p-4 shadow-[0_0_30px_rgba(15,23,42,0.18)]"
+    >
+      <button
+        type="button"
+        data-testid={`test-result-toggle-${result.testId}`}
+        aria-expanded={isExpanded}
+        aria-controls={detailsId}
+        onClick={toggle}
+        onKeyDown={handleKeyDown}
+        className="flex w-full items-center justify-between gap-4 text-left"
+      >
+        <div className="flex flex-col">
+          <span className="text-sm font-semibold text-text/90">{result.testName}</span>
+          <span className="text-xs text-text/50">Test #{result.testId}</span>
+        </div>
+        <div className="flex items-center gap-3">
+          <span
+            data-testid={`test-result-severity-${result.testId}`}
+            className={`flex items-center gap-2 rounded-full border px-2 py-1 text-[11px] uppercase tracking-[0.2em] ${severityStyle.className}`}
+          >
+            <FontAwesomeIcon icon={severityStyle.icon} className="text-[10px]" />
+            {severityStyle.label}
+          </span>
+          <FontAwesomeIcon
+            icon={faChevronDown}
+            className={`text-xs text-text/60 transition-transform duration-300 ${
+              isExpanded ? "rotate-180" : "rotate-0"
+            }`}
+          />
+        </div>
+      </button>
+
+      <div
+        id={detailsId}
+        className={`mt-3 grid transition-[grid-template-rows,opacity] duration-300 ease-out ${
+          isExpanded ? "grid-rows-[1fr] opacity-100" : "grid-rows-[0fr] opacity-0"
+        }`}
+      >
+        <div className="overflow-hidden">
+          <div className="rounded-xl border border-info/10 bg-background/40 p-3">
+            <div className="flex flex-col gap-1">
+              <span className="text-[10px] uppercase tracking-[0.2em] text-text/40">
+                Header
+              </span>
+              <span className="text-xs text-text/60">{result.headerName}</span>
+              <span className="font-mono text-sm text-text/80">{result.headerValue}</span>
+            </div>
+
+            {result.analysis ? (
+              <p className="mt-3 text-sm text-text/70">{result.analysis}</p>
+            ) : null}
+            {result.description ? (
+              <p className="mt-1 text-xs text-text/50">{result.description}</p>
+            ) : null}
+
+            {result.status === "error" ? (
+              <div
+                role="alert"
+                data-testid={`test-result-error-${result.testId}`}
+                className="mt-3 flex items-start gap-2 rounded-xl border border-spam/30 bg-spam/10 p-3 text-xs text-spam"
+              >
+                <FontAwesomeIcon icon={faTriangleExclamation} className="mt-0.5" />
+                <span>
+                  <span className="font-semibold">Error:</span> {getErrorMessage(result)}
+                </span>
+              </div>
+            ) : null}
+          </div>
+        </div>
+      </div>
+    </article>
+  );
+}