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105 lines
1.9 KiB
105 lines
1.9 KiB
'use strict';
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// Flags: --expose-internals
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require('../common');
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const assert = require('assert');
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const L = require('_linklist'); // eslint-disable-line no-restricted-modules
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const internalL = require('internal/linkedlist');
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assert.strictEqual(L, internalL);
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var list = { name: 'list' };
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var A = { name: 'A' };
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var B = { name: 'B' };
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var C = { name: 'C' };
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var D = { name: 'D' };
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L.init(list);
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L.init(A);
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L.init(B);
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L.init(C);
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L.init(D);
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assert.ok(L.isEmpty(list));
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assert.equal(null, L.peek(list));
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L.append(list, A);
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// list -> A
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assert.equal(A, L.peek(list));
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L.append(list, B);
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// list -> A -> B
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assert.equal(A, L.peek(list));
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L.append(list, C);
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// list -> A -> B -> C
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assert.equal(A, L.peek(list));
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L.append(list, D);
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// list -> A -> B -> C -> D
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assert.equal(A, L.peek(list));
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var x = L.shift(list);
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assert.equal(A, x);
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// list -> B -> C -> D
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assert.equal(B, L.peek(list));
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x = L.shift(list);
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assert.equal(B, x);
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// list -> C -> D
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assert.equal(C, L.peek(list));
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// B is already removed, so removing it again shouldn't hurt.
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L.remove(B);
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// list -> C -> D
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assert.equal(C, L.peek(list));
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// Put B back on the list
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L.append(list, B);
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// list -> C -> D -> B
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assert.equal(C, L.peek(list));
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L.remove(C);
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// list -> D -> B
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assert.equal(D, L.peek(list));
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L.remove(B);
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// list -> D
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assert.equal(D, L.peek(list));
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L.remove(D);
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// list
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assert.equal(null, L.peek(list));
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assert.ok(L.isEmpty(list));
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L.append(list, D);
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// list -> D
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assert.equal(D, L.peek(list));
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L.append(list, C);
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L.append(list, B);
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L.append(list, A);
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// list -> D -> C -> B -> A
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// Append should REMOVE C from the list and append it to the end.
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L.append(list, C);
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// list -> D -> B -> A -> C
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assert.equal(D, L.shift(list));
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// list -> B -> A -> C
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assert.equal(B, L.peek(list));
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assert.equal(B, L.shift(list));
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// list -> A -> C
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assert.equal(A, L.peek(list));
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assert.equal(A, L.shift(list));
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// list -> C
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assert.equal(C, L.peek(list));
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assert.equal(C, L.shift(list));
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// list
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assert.ok(L.isEmpty(list));
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