chore: rename tools/metadata into tools/ts-metadata-collector

Needed to that we can use the locally compiled one during
our tests.

tools/ts-metadata-collector/test/symbols.spec.ts

@@ -0,0 +1,29 @@
+import * as ts from 'typescript';
+import {Symbols} from '../src/symbols';
+import {MockSymbol, MockVariableDeclaration} from './typescript.mocks';
+
+describe('Symbols', () => {
+  let symbols: Symbols;
+  const someValue = 'some-value';
+  const someSymbol = MockSymbol.of('some-symbol');
+  const aliasSymbol = new MockSymbol('some-symbol', someSymbol.getDeclarations()[0]);
+  const missingSymbol = MockSymbol.of('some-other-symbol');
+
+  beforeEach(() => symbols = new Symbols());
+
+  it('should be able to add a symbol', () => symbols.set(someSymbol, someValue));
+
+  beforeEach(() => symbols.set(someSymbol, someValue));
+
+  it('should be able to `has` a symbol', () => expect(symbols.has(someSymbol)).toBeTruthy());
+  it('should be able to `get` a symbol value',
+     () => expect(symbols.get(someSymbol)).toBe(someValue));
+  it('should be able to `has` an alias symbol',
+     () => expect(symbols.has(aliasSymbol)).toBeTruthy());
+  it('should be able to `get` a symbol value',
+     () => expect(symbols.get(aliasSymbol)).toBe(someValue));
+  it('should be able to determine symbol is missing',
+     () => expect(symbols.has(missingSymbol)).toBeFalsy());
+  it('should return undefined from `get` for a missing symbol',
+     () => expect(symbols.get(missingSymbol)).toBeUndefined());
+});