1 files changed, 3 insertions, 1 deletions
diff --git a/tests/drivers/completion_test.js b/tests/drivers/completion_test.js
index 22c5fa5..f1ee5e6 100644
--- a/tests/drivers/completion_test.js
+++ b/tests/drivers/completion_test.js
@@ -1,5 +1,7 @@
 // compiler-backed completion, including incomplete source and position-aware lifetimes.
 // usage: node tests/drivers/completion_test.js path/to/zclsp [server arguments]
+// interpreted hosts (no jit) are far slower; ZC_TEST_TIMEOUT_SCALE stretches every deadline
+const TIMEOUT_SCALE = Number(process.env.ZC_TEST_TIMEOUT_SCALE) || 1;
 const assert = require('assert');
 const cp = require('child_process');
 const path = require('path');
@@ -25,7 +27,7 @@ function complete(source, extra = []) {
         for (const m of msgs) proc.stdin.write(frame(m));
         output = Buffer.concat(chunks);
     } else {
-        const r = cp.spawnSync(process.argv[2], process.argv.slice(3), { input: Buffer.concat(msgs.map(frame)), timeout: 30000, maxBuffer: 32 << 20 });
+        const r = cp.spawnSync(process.argv[2], process.argv.slice(3), { input: Buffer.concat(msgs.map(frame)), timeout: 30000 * TIMEOUT_SCALE, maxBuffer: 32 << 20 });
         assert.strictEqual(r.status, 0, String(r.stderr)); output = r.stdout;
     }
     let b = output; const replies = [];