test: http2 test coverage for updateOptionsBuffer

PR-URL: https://github.com/nodejs/node/pull/15105
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>

test/parallel/test-http2-util-update-options-buffer.js

@@ -0,0 +1,67 @@
+// Flags: --expose-internals
+'use strict';
+
+require('../common');
+
+// Test coverage for the updateOptionsBuffer method used internally
+// by the http2 implementation.
+
+const { updateOptionsBuffer } = require('internal/http2/util');
+const { optionsBuffer } = process.binding('http2');
+const { ok, strictEqual } = require('assert');
+
+const IDX_OPTIONS_MAX_DEFLATE_DYNAMIC_TABLE_SIZE = 0;
+const IDX_OPTIONS_MAX_RESERVED_REMOTE_STREAMS = 1;
+const IDX_OPTIONS_MAX_SEND_HEADER_BLOCK_LENGTH = 2;
+const IDX_OPTIONS_PEER_MAX_CONCURRENT_STREAMS = 3;
+const IDX_OPTIONS_PADDING_STRATEGY = 4;
+const IDX_OPTIONS_FLAGS = 5;
+
+{
+  updateOptionsBuffer({
+    maxDeflateDynamicTableSize: 1,
+    maxReservedRemoteStreams: 2,
+    maxSendHeaderBlockLength: 3,
+    peerMaxConcurrentStreams: 4,
+    paddingStrategy: 5
+  });
+
+  strictEqual(optionsBuffer[IDX_OPTIONS_MAX_DEFLATE_DYNAMIC_TABLE_SIZE], 1);
+  strictEqual(optionsBuffer[IDX_OPTIONS_MAX_RESERVED_REMOTE_STREAMS], 2);
+  strictEqual(optionsBuffer[IDX_OPTIONS_MAX_SEND_HEADER_BLOCK_LENGTH], 3);
+  strictEqual(optionsBuffer[IDX_OPTIONS_PEER_MAX_CONCURRENT_STREAMS], 4);
+  strictEqual(optionsBuffer[IDX_OPTIONS_PADDING_STRATEGY], 5);
+
+  const flags = optionsBuffer[IDX_OPTIONS_FLAGS];
+
+  ok(flags & (1 << IDX_OPTIONS_MAX_DEFLATE_DYNAMIC_TABLE_SIZE));
+  ok(flags & (1 << IDX_OPTIONS_MAX_RESERVED_REMOTE_STREAMS));
+  ok(flags & (1 << IDX_OPTIONS_MAX_SEND_HEADER_BLOCK_LENGTH));
+  ok(flags & (1 << IDX_OPTIONS_PEER_MAX_CONCURRENT_STREAMS));
+  ok(flags & (1 << IDX_OPTIONS_PADDING_STRATEGY));
+}
+
+{
+  optionsBuffer[IDX_OPTIONS_MAX_SEND_HEADER_BLOCK_LENGTH] = 0;
+
+  updateOptionsBuffer({
+    maxDeflateDynamicTableSize: 1,
+    maxReservedRemoteStreams: 2,
+    peerMaxConcurrentStreams: 4,
+    paddingStrategy: 5
+  });
+
+  strictEqual(optionsBuffer[IDX_OPTIONS_MAX_DEFLATE_DYNAMIC_TABLE_SIZE], 1);
+  strictEqual(optionsBuffer[IDX_OPTIONS_MAX_RESERVED_REMOTE_STREAMS], 2);
+  strictEqual(optionsBuffer[IDX_OPTIONS_MAX_SEND_HEADER_BLOCK_LENGTH], 0);
+  strictEqual(optionsBuffer[IDX_OPTIONS_PEER_MAX_CONCURRENT_STREAMS], 4);
+  strictEqual(optionsBuffer[IDX_OPTIONS_PADDING_STRATEGY], 5);
+
+  const flags = optionsBuffer[IDX_OPTIONS_FLAGS];
+
+  ok(flags & (1 << IDX_OPTIONS_MAX_DEFLATE_DYNAMIC_TABLE_SIZE));
+  ok(flags & (1 << IDX_OPTIONS_MAX_RESERVED_REMOTE_STREAMS));
+  ok(!(flags & (1 << IDX_OPTIONS_MAX_SEND_HEADER_BLOCK_LENGTH)));
+  ok(flags & (1 << IDX_OPTIONS_PEER_MAX_CONCURRENT_STREAMS));
+  ok(flags & (1 << IDX_OPTIONS_PADDING_STRATEGY));
+}