Include inner exceptions in stack traces

src/core/ExceptionFormatter.js

@@ -44,18 +44,38 @@ getJasmineRequireObj().ExceptionFormatter = function(j$) {
         return null;
       }
 
-      const stackTrace = new j$.StackTrace(error);
-      const lines = filterJasmine(stackTrace);
-      let result = '';
+      const lines = this.stack_(error, {
+        messageHandling: omitMessage ? 'omit' : undefined
+      });
+      return lines.join('\n');
+    };
 
-      if (stackTrace.message && !omitMessage) {
+    // messageHandling can be falsy (unspecified), 'omit', or 'require'
+    this.stack_ = function(error, { messageHandling }) {
+      let lines = formatProperties(error).split('\n');
+
+      if (lines[lines.length - 1] === '') {
+        lines.pop();
+      }
+
+      const stackTrace = new j$.StackTrace(error);
+      lines = lines.concat(filterJasmine(stackTrace));
+
+      if (messageHandling === 'require') {
+        lines.unshift(stackTrace.message || 'Error: ' + error.message);
+      } else if (messageHandling !== 'omit' && stackTrace.message) {
         lines.unshift(stackTrace.message);
       }
 
-      result += formatProperties(error);
-      result += lines.join('\n');
+      if (error.cause) {
+        const substack = this.stack_(error.cause, {
+          messageHandling: 'require'
+        });
+        substack[0] = 'Caused by: ' + substack[0];
+        lines = lines.concat(substack);
+      }
 
-      return result;
+      return lines;
     };
 
     function filterJasmine(stackTrace) {