jest-jasmine2: pretty-print non-Error errors

jestjs · Apr 13, 2018 · 5ae6dfa · 5ae6dfa
1 parent a0bf957
commit 5ae6dfa
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Showing 2 changed files with 14 additions and 3 deletions.
diff --git a/packages/jest-jasmine2/package.json b/packages/jest-jasmine2/package.json
@@ -18,7 +18,8 @@
     "jest-message-util": "^22.4.0",
     "jest-snapshot": "^22.4.0",
     "jest-util": "^22.4.1",
-    "source-map-support": "^0.5.0"
+    "source-map-support": "^0.5.0",
+    "pretty-format": "^22.4.0"
   },
   "devDependencies": {
     "jest-runtime": "^22.4.2"

diff --git a/packages/jest-jasmine2/src/jasmine/Env.js b/packages/jest-jasmine2/src/jasmine/Env.js
@@ -32,6 +32,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 import queueRunner from '../queue_runner';
 import treeProcessor from '../tree_processor';
+import prettyFormat from 'pretty-format';
 
 // Try getting the real promise object from the context, if available. Someone
 // could have overridden it in a test. Async functions return it implicitly.
@@ -548,9 +549,18 @@ export default function(j$) {
 
     this.fail = function(error) {
       let message = 'Failed';
+      // duck-type Error, see #2549
+      let isError =
+        typeof error === 'object' &&
+        typeof error.message === 'string' &&
+        typeof error.name === 'string';
       if (error) {
         message += ': ';
-        message += error.message || error;
+        if (isError) {
+          message += error.message;
+        } else {
+          message += prettyFormat(error);
+        }
       }
 
       currentRunnable().addExpectationResult(false, {
@@ -559,7 +569,7 @@ export default function(j$) {
         expected: '',
         actual: '',
         message,
-        error: error && error.message ? error : null,
+        error: isError ? error : null,
       });
     };
   }