oven-sh/bun · error · Error

Unsupported test runner: ${testRunner}

Error message

Unsupported test runner: ${testRunner}

What it means

Error "Unsupported test runner: ${testRunner}" thrown in oven-sh/bun.

Source

Thrown at scripts/runner.node.mjs:1214

        cwd: vendorPath,
        args: ["run", "build"],
        timeout: 60_000,
      });
      if (!buildResult.ok) {
        throw new Error(`Failed to build vendor: ${buildResult.error}`);
      }

      for (const testPath of testPaths) {
        const title = join(relative(cwd, vendorPath), testPath).replace(/\\/g, "/");

        if (testRunner === "bun") {
          await runTest(title, index =>
            spawnBunTest(execPath, testPath, { cwd: vendorPath, env: { TEST_SERIAL_ID: index } }),
          );
        } else {
          const testRunnerPath = join(cwd, "test", "runners", `${testRunner}.ts`);
          if (!existsSync(testRunnerPath)) {
            throw new Error(`Unsupported test runner: ${testRunner}`);
          }
          await runTest(title, () =>
            spawnBunTest(execPath, testPath, {
              cwd: vendorPath,
              args: ["--preload", testRunnerPath],
            }),
          );
        }
      }
    }
  }

  // tests are all over, close the group from the final test. any further output should print ungrouped.
  startGroup("End");

  if (isGithubAction) {
    reportOutputToGitHubAction("failing_tests_count", failedResults.length);
    const markdown = formatTestToMarkdown(failedResults, false, 0);

View on GitHub (pinned to 8c5296ac45)

When it happens

Trigger: Thrown at scripts/runner.node.mjs:1214 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of oven-sh/bun@8c5296ac45 (2026-08-16). Data as JSON: /api/errors/1bc04d7acb56186d. Report an issue: GitHub.