guard against missing semicolons in import statements

test/unit/mocha/part4/book-list-contains-book-item-import.spec.js

@@ -21,7 +21,14 @@ describe('BookList.vue', () => {
  const script = nodes.filter(node => node.nodeName === 'script');
 
  // Test for correct import statement
- const ast = esprima.parse(script[0].childNodes[0].value, { sourceType: 'module' });
+
+ let ast
+ try {
+ ast = esprima.parse(script[0].childNodes[0].value, { sourceType: 'module' });
+ } catch (e) {
+ assert(false, "It looks like your import statement is missing a semicolon at the end.") 
+ }
+
  let results = esquery(ast, 'ImportDeclaration[source.value="./BookItem"]');
  assert(results.length > 0, 'The `BookItem` class was not imported from `./BookItem` In BookList.vue');
 

test/unit/mocha/part4/book-list-contains-book-item.spec.js

@@ -21,7 +21,13 @@ describe('BookList.vue', () => {
  const script = nodes.filter(node => node.nodeName === 'script');
 
  // Test for bookList definition in the component key
- const ast = esprima.parse(script[0].childNodes[0].value, { sourceType: 'module' });
+ let ast
+ try {
+ ast = esprima.parse(script[0].childNodes[0].value, { sourceType: 'module' });
+ } catch (e) {
+ assert(false, "It looks like your import statement is missing a semicolon at the end.") 
+ }
+
  const results = esquery(ast, 'Property[key.name=components] > ObjectExpression > Property[key.name=BookItem]');
  assert(results.length > 0, 'The value of the `components` property is not an object containing `BookItem` in BookList.vue');
  });

test/unit/mocha/part5/book-list-contains-methods-declaration.spec.js

@@ -20,7 +20,13 @@ describe('BookList.vue', () => {
  assert(false, "We either didn't find a script tag, or any code in a script tag in the BookForm component.")
  }
 
- const ast = esprima.parse(script[0].childNodes[0].value, { sourceType: 'module' });
+ let ast
+ try {
+ ast = esprima.parse(script[0].childNodes[0].value, { sourceType: 'module' });
+ } catch (e) {
+ assert(false, "Something went wrong and we weren't able to check your code.")
+ }
+
  const methods = esquery(ast, 'Property[key.name=methods]');
  assert(methods.length > 0, 'The BookList\'s `methods` declaration is not present');
  });