chore: migrate test cases from Chai to Jest

src/cache/lru.spec.ts

@@ -0,0 +1,67 @@
+import { LRU } from './lru'
+
+describe('LRU', () => {
+  it('should perform read()/write()', () => {
+    const lru = new LRU(2)
+    expect(lru.limit).toEqual(2)
+
+    lru.write('foo', 'FOO')
+    lru.write('bar', 'BAR')
+    expect(lru.read('foo')).toEqual('FOO')
+    expect(lru.read('bar')).toEqual('BAR')
+  })
+  it('should perform clear()', () => {
+    const lru = new LRU(2)
+    lru.write('foo', 'FOO')
+    lru.write('bar', 'BAR')
+    expect(lru.size).toEqual(2)
+    lru.clear()
+    expect(lru.size).toEqual(0)
+    expect(lru.read('foo')).toBe(undefined)
+  })
+  it('should remove lrc item when full(limit=-1)', () => {
+    const lru = new LRU(-1)
+    lru.write('foo', 'FOO')
+    lru.write('bar', 'BAR')
+    expect(lru.size).toEqual(0)
+    expect(lru.read('foo')).toBe(undefined)
+    expect(lru.read('bar')).toBe(undefined)
+  })
+  it('should remove lrc item when full(limit=0)', () => {
+    const lru = new LRU(0)
+    lru.write('foo', 'FOO')
+    lru.write('bar', 'BAR')
+    expect(lru.size).toEqual(0)
+    expect(lru.read('foo')).toBe(undefined)
+    expect(lru.read('bar')).toBe(undefined)
+  })
+  it('should remove lrc item when full(limit=1)', () => {
+    const lru = new LRU(1)
+    lru.write('foo', 'FOO')
+    lru.write('bar', 'BAR')
+    expect(lru.size).toEqual(1)
+    expect(lru.read('foo')).toBe(undefined)
+    expect(lru.read('bar')).toEqual('BAR')
+  })
+  it('should remove lrc item when full(limit=2)', () => {
+    const lru = new LRU(2)
+    expect(lru.size).toEqual(0)
+    lru.write('foo', 'FOO')
+    expect(lru.size).toEqual(1)
+    lru.write('bar', 'BAR')
+    expect(lru.size).toEqual(2)
+    lru.write('coo', 'COO')
+    expect(lru.size).toEqual(2)
+    expect(lru.read('foo')).toBe(undefined)
+    expect(lru.read('bar')).toEqual('BAR')
+    expect(lru.read('coo')).toEqual('COO')
+  })
+  it('should overwrite item the with same key', () => {
+    const lru = new LRU(2)
+    lru.write('foo', 'FOO')
+    expect(lru.size).toEqual(1)
+    lru.write('foo', 'BAR')
+    expect(lru.size).toEqual(1)
+    expect(lru.read('foo')).toEqual('BAR')
+  })
+})