add fast api test

Author: gurgunday

test/sequential/test-zlib-crc32-fast-api.js

@@ -0,0 +1,26 @@
+// Flags: --expose-internals --no-warnings --allow-natives-syntax
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const zlib = require('zlib');
+
+{
+  function testFastPath() {
+    const expected = 0xd87f7e0c; // zlib.crc32('test', 0)
+    assert.strictEqual(zlib.crc32('test', 0), expected);
+    return expected;
+  }
+
+  eval('%PrepareFunctionForOptimization(zlib.crc32)');
+  testFastPath();
+  eval('%OptimizeFunctionOnNextCall(zlib.crc32)');
+  testFastPath();
+  testFastPath();
+
+  if (common.isDebug) {
+    const { internalBinding } = require('internal/test/binding');
+    const { getV8FastApiCallCount } = internalBinding('debug');
+    assert.strictEqual(getV8FastApiCallCount('zlib.crc32'), 2);
+  }
+}