Parallel: fail if randomization is disabled or a seed is specified

src/core/Env.js

@@ -532,6 +532,11 @@ getJasmineRequireObj().Env = function(j$) {
      */
     this.execute = async function(runablesToRun) {
       installGlobalErrors();
+
+      if (parallelLoadingState) {
+        validateConfigForParallel();
+      }
+
       return runner.execute(runablesToRun);
     };
 
@@ -689,6 +694,16 @@ getJasmineRequireObj().Env = function(j$) {
       }
     }
 
+    function validateConfigForParallel() {
+      if (!config.random) {
+        throw new Error('Randomization cannot be disabled in parallel mode');
+      }
+
+      if (config.seed !== null && config.seed !== undefined) {
+        throw new Error('Random seed cannot be set in parallel mode');
+      }
+    }
+
     this.describe = function(description, definitionFn) {
       ensureIsNotNested('describe');
       return suiteBuilder.describe(description, definitionFn).metadata;