diff --git a/script/assert-test-summary.test.ts b/script/assert-test-summary.test.ts
new file mode 100644
index 000000000..9211aa2f1
--- /dev/null
+++ b/script/assert-test-summary.test.ts
@@ -0,0 +1,42 @@
+import { describe, expect, test } from "bun:test"
+import { hasBunTestSummary } from "./assert-test-summary"
+
+describe("bun test summary detection", () => {
+  test("#given completed bun test output #when checking for a summary #then it is accepted", () => {
+    // given
+    const output = `bun test v1.3.12 (700fc117)
+
+ 28 pass
+ 0 fail
+Ran 28 tests across 1 file. [64.00ms]
+`
+
+    // when
+    const hasSummary = hasBunTestSummary(output)
+
+    // then
+    expect(hasSummary).toBe(true)
+  })
+
+  test("#given banner-only bun test output #when checking for a summary #then it is rejected", () => {
+    // given
+    const output = "bun test v1.3.12 (700fc117)\n"
+
+    // when
+    const hasSummary = hasBunTestSummary(output)
+
+    // then
+    expect(hasSummary).toBe(false)
+  })
+
+  test("#given zero-count summary output #when checking for a summary #then it is rejected", () => {
+    // given
+    const output = "Ran 0 tests across 0 files. [1.00ms]\n"
+
+    // when
+    const hasSummary = hasBunTestSummary(output)
+
+    // then
+    expect(hasSummary).toBe(false)
+  })
+})
diff --git a/script/assert-test-summary.ts b/script/assert-test-summary.ts
new file mode 100644
index 000000000..b9a71cd7d
--- /dev/null
+++ b/script/assert-test-summary.ts
@@ -0,0 +1,25 @@
+/// <reference types="bun-types" />
+
+export const bunTestSummaryPattern = /^Ran [1-9][0-9]* tests across [1-9][0-9]* files?\./m
+
+export function hasBunTestSummary(output: string): boolean {
+  return bunTestSummaryPattern.test(output)
+}
+
+async function assertTestSummaryFromLog(logPath: string): Promise<void> {
+  const output = await Bun.file(logPath).text()
+
+  if (!hasBunTestSummary(output)) {
+    throw new Error(`Missing bun test completion summary in ${logPath}`)
+  }
+}
+
+if (import.meta.main) {
+  const [logPath] = process.argv.slice(2)
+
+  if (!logPath) {
+    throw new Error("Usage: bun run script/assert-test-summary.ts <bun-test-log-path>")
+  }
+
+  await assertTestSummaryFromLog(logPath)
+}