Add test case for preserveWithJsExtension

Author: David Sheldrick

tests/baselines/reference/getEmitOutputTsxFile_PreserveWithJsExtension.baseline

@@ -0,0 +1,26 @@
+EmitSkipped: false
+FileName : /tests/cases/fourslash/inputFile1.js.map
+{"version":3,"file":"inputFile1.js","sourceRoot":"","sources":["inputFile1.ts"],"names":[],"mappings":"AAAA,kBAAkB;AACjB,IAAI,CAAC,GAAW,CAAC,CAAC;AAClB;IAAA;IAGA,CAAC;IAAD,UAAC;AAAD,CAAC,AAHD,IAGC"}FileName : /tests/cases/fourslash/inputFile1.js
+// regular ts file
+var t = 5;
+var Bar = (function () {
+    function Bar() {
+    }
+    return Bar;
+}());
+//# sourceMappingURL=inputFile1.js.mapFileName : /tests/cases/fourslash/inputFile1.d.ts
+declare var t: number;
+declare class Bar {
+    x: string;
+    y: number;
+}
+
+EmitSkipped: false
+FileName : /tests/cases/fourslash/inputFile2.js.map
+{"version":3,"file":"inputFile2.js","sourceRoot":"","sources":["inputFile2.tsx"],"names":[],"mappings":"AAAA,IAAI,CAAC,GAAG,QAAQ,CAAC;AACjB,IAAI,CAAC,GAAG,CAAC,GAAG,CAAC,IAAI,CAAE,CAAC,CAAC,CAAC,EAAG,CAAA"}FileName : /tests/cases/fourslash/inputFile2.js
+var y = "my div";
+var x = <div name={y}/>;
+//# sourceMappingURL=inputFile2.js.mapFileName : /tests/cases/fourslash/inputFile2.d.ts
+declare var y: string;
+declare var x: any;
+

tests/cases/fourslash/getEmitOutputTsxFile_PreserveWithJsExtension.ts

@@ -0,0 +1,22 @@
+/// <reference path="fourslash.ts" />
+
+// @BaselineFile: getEmitOutputTsxFile_PreserveWithJsExtension.baseline
+// @declaration: true
+// @sourceMap: true
+// @jsx: preserveWithJsExtension
+
+// @Filename: inputFile1.ts
+// @emitThisFile: true
+////// regular ts file
+//// var t: number = 5;
+//// class Bar {
+////    x : string;
+////    y : number
+//// }
+
+// @Filename: inputFile2.tsx
+// @emitThisFile: true
+//// var y = "my div";
+//// var x = <div name= {y} />
+
+verify.baselineGetEmitOutput();