add infrastructure for sourcemap tests

package.json

@@ -56,6 +56,7 @@
     "rollup-plugin-buble": "^0.14.0",
     "rollup-plugin-commonjs": "^5.0.5",
     "rollup-plugin-node-resolve": "^2.0.0",
+    "source-map": "^0.5.6",
     "source-map-support": "^0.4.6"
   },
   "nyc": {

test/sourcemaps/basic/input.html

@@ -0,0 +1,9 @@
+{{foo.bar.baz}}
+
+<script>
+	export default {
+		onrender () {
+			console.log( 42 );
+		}
+	};
+</script>

test/sourcemaps/basic/test.js

@@ -0,0 +1,7 @@
+export function test ( assert, code, map, smc, locator ) {
+	console.log( `code`, code )
+	console.log( `map`, map )
+
+	let loc = locator( 'foo.bar.baz' );
+	console.log( `loc`, loc )
+}

test/test.js

@@ -5,6 +5,8 @@ import * as path from 'path';
 import * as fs from 'fs';
 import jsdom from 'jsdom';
 import * as acorn from 'acorn';
+import { SourceMapConsumer } from 'source-map';
+import { getLocator } from 'locate-character';
 
 import * as consoleGroup from 'console-group';
 consoleGroup.install();
@@ -468,4 +470,24 @@ describe( 'svelte', () => {
 			});
 		});
 	});
+
+	describe( 'sourcemaps', () => {
+		fs.readdirSync( 'test/sourcemaps' ).forEach( dir => {
+			if ( dir[0] === '.' ) return;
+
+			const solo = exists( `test/sourcemaps/${dir}/solo` );
+
+			( solo ? it.only : it )( dir, () => {
+				const input = fs.readFileSync( `test/sourcemaps/${dir}/input.html`, 'utf-8' ).replace( /\s+$/, '' );
+				const { code, map } = svelte.compile( input );
+
+				const { test } = require( `./sourcemaps/${dir}/test.js` );
+
+				const smc = new SourceMapConsumer( map );
+				const locator = getLocator( code );
+
+				test( assert, code, map, smc, locator );
+			});
+		});
+	});
 });