feat: support default test timeout in bunfig.toml

docs/runtime/bunfig.md

@@ -144,6 +144,15 @@ Same as the top-level `smol` field, but only applies to `bun test`.
 smol = true
 ```
 
+### `test.timeout`
+
+A default timeout for each test in milliseconds. Default `5000`. Use `--timeout` to override.
+
+```toml
+[test]
+timeout = 15000
+```
+
 ### `test.coverage`
 
 Enables coverage reporting. Default `false`. Use `--coverage` to override.

src/bunfig.zig

@@ -253,6 +253,11 @@ pub const Bunfig = struct {
                         this.ctx.runtime_options.smol = expr.data.e_boolean.value;
                     }
 
+                    if (test_.get("timeout")) |expr| {
+                        try this.expect(expr, .e_big_int);
+                        this.ctx.test_options.default_timeout_ms = expr.data.e_big_int.value;
+                    }
+
                     if (test_.get("coverage")) |expr| {
                         try this.expect(expr, .e_boolean);
                         this.ctx.test_options.coverage.enabled = expr.data.e_boolean.value;