feat(jest): support shard CLI options (#1314) (#1315)

packages/jest/scripts/ci.sh

@@ -67,6 +67,7 @@ simpleAppTestOptions=(
     "yarn test|--no-cache|1|1|3|3|||"
     "yarn test|--test-name-pattern=^AppComponent should create the app$|1|1|1|3|2||"
     "yarn test|--reporters=default;--reporters=jest-junit|1|1|3|3||checkJunit"
+    "yarn test|--shard=1/2|1|1|3|3||"
 )
 
 multiAppTestOptions=(

packages/jest/src/schema.json

@@ -482,6 +482,10 @@
     "tsConfig": {
       "description": "The path to the TypeScript configuration file.",
       "type": "string"
+    },
+    "shard": {
+      "description": "The test suite shard to execute in a format of (?<shardIndex>\\d+)/(?<shardCount>\\d+).\n\nshardIndex describes which shard to select while shardCount controls the number of shards the suite should be split into.\n\nshardIndex and shardCount have to be 1-based, positive numbers, and shardIndex has to be lower than or equal to shardCount.\n\nWhen shard is specified the configured testSequencer has to implement a shard method.\n\nFor example, to split the suite into three shards, each running one third of the tests:",
+      "type": "string"
     }
   },
   "additionalProperties": { "type": "array", "items": { "type": "string" } }