Add tests for error codes

packages/babel-parser/test/error-codes.js

@@ -0,0 +1,21 @@
+import { parse } from "../lib";
+
+describe("error codes", function () {
+  it("raises an error with BABEL_PARSER_SOURCETYPE_MODULE_REQUIRED and reasonCode", function () {
+    const code = `import "foo"`;
+    const { errors } = parse(code, {
+      errorRecovery: true,
+      sourceType: "script",
+    });
+    const error = errors[0];
+    expect(error.code).toBe("BABEL_PARSER_SOURCETYPE_MODULE_REQUIRED");
+    expect(error.reasonCode).toBe("ImportOutsideModule");
+  });
+  it("raises an error with BABEL_PARSER_SYNTAX_ERROR and reasonCode", function () {
+    const code = `a b`;
+    const { errors } = parse(code, { errorRecovery: true });
+    const error = errors[0];
+    expect(error.code).toBe("BABEL_PARSER_SYNTAX_ERROR");
+    expect(error.reasonCode).toBe("MissingSemicolon");
+  });
+});