test(harden): add cjs(entrypoint) & negative test

Author: DrSensor

test/__snapshots__/error.test.js.snap

@@ -0,0 +1,12 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Errors Loader Error 1`] = `"Cannot read property 'version' of undefined"`;
+
+exports[`Errors Validation Error 1`] = `
+"binaryen-loader
+
+  Options Validation Error
+
+  options['useRelativePath']  is an invalid additional property
+"
+`;

test/cjs.test.js

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+import loader from '../src';
+import CJSLoader from '../src/cjs';
+
+describe('CJS', () => {
+  it('should export loader', () => {
+    expect(CJSLoader).toEqual(loader);
+  });
+
+  it('should export `raw` flag', () => {
+    expect(CJSLoader.raw).toEqual(false);
+  });
+});

test/error.test.js

@@ -0,0 +1,21 @@
+import loader from '../src';
+
+describe('Errors', () => {
+  test('Loader Error', () => {
+    const err = () => loader.call();
+
+    expect(err).toThrow();
+    expect(err).toThrowErrorMatchingSnapshot();
+  });
+
+  test('Validation Error', () => {
+    const err = () =>
+      loader.call({
+        query: { useRelativePath: 1 },
+        emitFile: true,
+      });
+
+    expect(err).toThrow();
+    expect(err).toThrowErrorMatchingSnapshot();
+  });
+});