fix: tests

Author: snitin315

e2e/__tests__/__snapshots__/failures.test.ts.snap

@@ -188,9 +188,19 @@ FAIL __tests__/duringTests.test.js
 
   ● Object with stack prop thrown during test
 
-    42
+    thrown: Object {
+      "stack": 42,
+    }
 
+      30 | });
+      31 | 
+    > 32 | test('Object with stack prop thrown during test', () => {
+         | ^
+      33 |   // eslint-disable-next-line no-throw-literal
+      34 |   throw {stack: 42};
+      35 | });
 
+      at Object.test (__tests__/duringTests.test.js:32:1)
 
   ● Error during test
 

packages/jest-jasmine2/src/expectationResultFactory.ts

@@ -43,7 +43,7 @@ function stackFormatter(
   }
 
   if (options.error) {
-    if (options.error.stack) {
+    if ( typeof options.error.stack === 'string') {
       return options.error.stack;
     }