test: limit young generation in heap snapshot tests

Set maxYoungGenerationSizeMb for the worker heap snapshot tests so the
temporary heap limit used while writing the snapshot is deterministic.
This keeps the tests focused on verifying that one snapshot is written
before the worker reports ERR_WORKER_OUT_OF_MEMORY.

Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5

Author: trivikr

test/fixtures/workload/grow-worker-and-set-near-heap-limit.js

@@ -9,7 +9,10 @@ new Worker(path.join(__dirname, 'grow-and-set-near-heap-limit.js'), {
   },
   resourceLimits: {
     maxOldGenerationSizeMb:
-      parseInt(process.env.TEST_OLD_SPACE_SIZE) || 20
-  }
+      parseInt(process.env.TEST_OLD_SPACE_SIZE) || 20,
+    ...(process.env.TEST_YOUNG_SPACE_SIZE !== undefined && {
+      maxYoungGenerationSizeMb: parseInt(process.env.TEST_YOUNG_SPACE_SIZE),
+    }),
+  },
 });
 

test/fixtures/workload/grow-worker.js

@@ -9,6 +9,9 @@ new Worker(path.join(__dirname, 'grow.js'), {
   ],
   resourceLimits: {
     maxOldGenerationSizeMb:
-      parseInt(process.env.TEST_OLD_SPACE_SIZE) || 20
-  }
+      parseInt(process.env.TEST_OLD_SPACE_SIZE) || 20,
+    ...(process.env.TEST_YOUNG_SPACE_SIZE !== undefined && {
+      maxYoungGenerationSizeMb: parseInt(process.env.TEST_YOUNG_SPACE_SIZE),
+    }),
+  },
 });

test/parallel/test-heapsnapshot-near-heap-limit-by-api-in-worker.js

@@ -22,6 +22,7 @@ const env = {
     env: {
       TEST_SNAPSHOTS: 1,
       TEST_OLD_SPACE_SIZE: 50,
+      TEST_YOUNG_SPACE_SIZE: 16,
       ...env
     }
   });

test/parallel/test-heapsnapshot-near-heap-limit-worker.js

@@ -20,6 +20,7 @@ const env = {
     env: {
       TEST_SNAPSHOTS: 1,
       TEST_OLD_SPACE_SIZE: 50,
+      TEST_YOUNG_SPACE_SIZE: 16,
       ...env
     }
   });