test: testing freelist module

test/parallel/test-freelist.js

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+'use strict';
+
+// Flags: --expose-internals
+
+const assert = require('assert');
+const freelist = require('freelist');
+const internalFreelist = require('internal/freelist');
+
+assert.equal(typeof freelist, 'object');
+assert.equal(typeof freelist.FreeList, 'function');
+assert.strictEqual(freelist, internalFreelist);
+
+const flist1 = new freelist.FreeList('flist1', 3, String);
+
+// Allocating when empty, should not change the list size
+var result = flist1.alloc('test');
+assert.strictEqual(typeof result, 'string');
+assert.strictEqual(result, 'test');
+assert.strictEqual(flist1.list.length, 0);
+
+// Exhaust the free list
+assert(flist1.free('test1'));
+assert(flist1.free('test2'));
+assert(flist1.free('test3'));
+
+// Now it should not return 'true', as max length is exceeded
+assert.strictEqual(flist1.free('test4'), false);
+assert.strictEqual(flist1.free('test5'), false);
+
+// At this point 'alloc' should just return the stored values
+assert.strictEqual(flist1.alloc(), 'test1');
+assert.strictEqual(flist1.alloc(), 'test2');
+assert.strictEqual(flist1.alloc(), 'test3');