test(preset): add test cases for deps analyzer

packages/preset-dumi/src/transformer/fixtures/demo-deps/circular/circular.ts

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+import { common } from '.';
+
+export default () => common;

packages/preset-dumi/src/transformer/fixtures/demo-deps/circular/index.ts

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+import yaml from 'js-yaml';
+import circular from './circular';
+
+export const common = typeof yaml;
+
+export default () => circular();

packages/preset-dumi/src/transformer/fixtures/demo-deps/multi-levels/index.ts

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+export * from './multi';

packages/preset-dumi/src/transformer/fixtures/demo-deps/multi-levels/last.ts

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+export { default as yaml } from 'js-yaml';
+export default 'last';

packages/preset-dumi/src/transformer/fixtures/demo-deps/multi-levels/level.ts

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+export * from './last';

packages/preset-dumi/src/transformer/fixtures/demo-deps/multi-levels/multi.ts

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+export * from './level';

packages/preset-dumi/src/transformer/fixtures/demo-deps/normal/index.tsx

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+import yaml from 'js-yaml';
+import normal from './normal';
+
+export default () => (
+  <>
+    <h1>{typeof yaml}</h1>
+    <p>{normal}</p>
+  </>
+)

packages/preset-dumi/src/transformer/fixtures/demo-deps/normal/normal.ts

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+export default 'normal';

packages/preset-dumi/src/transformer/test/demo-deps.test.ts

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+import fs from 'fs';
+import path from 'path';
+import analyzeDeps from '../demo/dependencies';
+
+describe('demo transformer: dependencies', () => {
+  it('basic analysis', () => {
+    const filePath = path.join(__dirname, '../fixtures/demo-deps/normal/index.tsx');
+    const result = analyzeDeps(fs.readFileSync(filePath).toString(), {
+      isTSX: true,
+      fileAbsPath: filePath,
+    });
+
+    expect(result.files['normal.ts']).not.toBeUndefined();
+    expect(result.dependencies['js-yaml']).not.toBeUndefined();
+  });
+
+  it('multi level', () => {
+    const filePath = path.join(__dirname, '../fixtures/demo-deps/multi-levels/index.ts');
+    const result = analyzeDeps(fs.readFileSync(filePath).toString(), {
+      isTSX: false,
+      fileAbsPath: filePath,
+    });
+
+    expect(result.files['multi.ts']).not.toBeUndefined();
+    expect(result.files['level.ts']).not.toBeUndefined();
+    expect(result.files['last.ts']).not.toBeUndefined();
+    expect(result.dependencies['js-yaml']).not.toBeUndefined();
+  });
+
+  it('circular reference', () => {
+    const filePath = path.join(__dirname, '../fixtures/demo-deps/circular/index.ts');
+    const result = analyzeDeps(fs.readFileSync(filePath).toString(), {
+      isTSX: false,
+      fileAbsPath: filePath,
+    });
+
+    expect(result.files['circular.ts']).not.toBeUndefined();
+    expect(Object.keys(result.files).length).toEqual(1);
+    expect(result.dependencies['js-yaml']).not.toBeUndefined();
+  });
+});