readme updates, add test for failing queries

Author: amilajack

README.md

@@ -1,5 +1,7 @@
 # sqlite
 
+🚧 A Work in Progress. Do Not Use 🚧
+
 [![Build Status](https://travis-ci.com/sqlite-js/sqlite.svg?branch=master)](https://travis-ci.com/sqlite-js/sqlite)
 
 An experimental SQLite library for Node using Neon
@@ -48,3 +50,11 @@ await Promise.all([
 const updateTables = await db.statement('UPDATE tbl SET name = ? WHERE email = ?');
 await updateTables('john', 'john@gmail.com');
 ```
+
+## Local Development
+```bash
+git clone https://github.com/sqlite-js/sqlite
+cd sqlite
+yarn
+yarn test
+```

native/src/lib.rs

@@ -91,7 +91,7 @@ declare_types! {
                 .enumerate()
                 .for_each(|(i, obj)| {
                     let js_string = cx.string(obj);
-                    js_array.set(&mut cx, i as u32, js_string);
+                    js_array.set(&mut cx, i as u32, js_string).unwrap();
                 });
 
             Ok(js_array.upcast())

test/__snapshots__/basic.spec.js.snap

@@ -0,0 +1,9 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`basic should execute query statements 1`] = `
+Array [
+  "john",
+]
+`;
+
+exports[`basic should format errors 1`] = `"internal error in Neon module: called \`Result::unwrap()\` on an \`Err\` value: SqliteFailure(Error { code: Unknown, extended_code: 1 }, Some(\\"no such column: asdfasdf\\"))"`;

test/basic.spec.js

@@ -25,11 +25,33 @@ describe('basic', () => {
       VALUES ("john");
     `);
 
-    conn.execute(`
+    expect(
+      await conn.execute(`
       SELECT *
       FROM contacts;
-    `);
+    `)
+    ).toMatchSnapshot();
 
     conn.execute('DROP TABLE contacts;');
   });
+
+  it('should format errors', async () => {
+    const conn = new Sqlite();
+
+    await conn.create({
+      verbose: true,
+      database: path.join(__dirname, 'test.db')
+    });
+
+    conn.execute('DROP TABLE IF EXISTS contacts;');
+
+    conn.execute('CREATE TABLE contacts (t VARCHAR PRIMARY KEY);');
+
+    expect(() => {
+      conn.execute(`
+        INSERT INTO contacts (t)
+        VALUES (asdfasdf);
+      `);
+    }).toThrowErrorMatchingSnapshot();
+  });
 });