trim when adding custom stack trace

Author: SimenB

integration-tests/__tests__/__snapshots__/failures.test.js.snap

@@ -14,6 +14,7 @@ exports[`not throwing Error objects 2`] = `
   ● Test suite failed to run
 
     Error
+
       banana
 
 "
@@ -142,7 +143,6 @@ exports[`not throwing Error objects 5`] = `
        9 | });
       10 | 
 
-
       at packages/jest-jasmine2/build/jasmine/Spec.js:85:20
       at __tests__/during_tests.test.js:7:1
 
@@ -158,7 +158,6 @@ exports[`not throwing Error objects 5`] = `
       13 |   throw false;
       14 | });
 
-
       at packages/jest-jasmine2/build/jasmine/Spec.js:85:20
       at __tests__/during_tests.test.js:11:1
 
@@ -174,7 +173,6 @@ exports[`not throwing Error objects 5`] = `
       18 |   throw undefined;
       19 | });
 
-
       at packages/jest-jasmine2/build/jasmine/Spec.js:85:20
       at __tests__/during_tests.test.js:16:1
 
@@ -197,7 +195,6 @@ exports[`not throwing Error objects 5`] = `
       23 |   throw deepObject;
       24 | });
 
-
       at packages/jest-jasmine2/build/jasmine/Spec.js:85:20
       at __tests__/during_tests.test.js:21:1
 

packages/jest-jasmine2/src/expectation_result_factory.js

@@ -47,7 +47,7 @@ function stackFormatter(options, initError, errorMessage) {
   }
 
   if (initError) {
-    return errorMessage + '\n' + initError.stack;
+    return errorMessage.trimRight() + '\n\n' + initError.stack;
   }
 
   return new Error(errorMessage).stack;