Issue 703: add ES&S conversion test

src/test/java/network/brightspots/rcv/TabulatorTests.java

@@ -235,6 +235,12 @@ void convertToCdfFromDominion() {
     runConvertToCdfTest("convert_to_cdf_from_dominion");
   }
 
+  @Test
+  @DisplayName("Test Convert to CDF works for ESS")
+  void convertToCdfFromEss() {
+    runConvertToCdfTest("convert_to_cdf_from_ess", "simple_ess");
+  }
+
   @Test
   @DisplayName("aliases (CDF JSON format)")
   void aliasesJson() {

src/test/resources/network/brightspots/rcv/test_data/_shared/simple_ess/simple_ess_config.json

@@ -0,0 +1,58 @@
+{
+  "tabulatorVersion": "TEST",
+  "outputSettings": {
+    "contestName": "Tiebreak test",
+    "outputDirectory": "output",
+    "contestDate": "2017-12-03",
+    "contestJurisdiction": "Funkytown, USA",
+    "contestOffice": "Sergeant-at-Arms",
+    "tabulateByPrecinct": false,
+    "generateCdfJson": false
+  },
+  "cvrFileSources": [
+    {
+      "filePath" : "simple_ess_cvr.xlsx",
+      "firstVoteColumnIndex" : "2",
+      "firstVoteRowIndex" : "2",
+      "idColumnIndex" : "",
+      "precinctColumnIndex" : "",
+      "provider" : "ess",
+      "treatBlankAsUndeclaredWriteIn": false,
+      "overvoteLabel": "overvote",
+      "undervoteLabel": "undervote",
+      "undeclaredWriteInLabel": ""
+    } ],
+  "candidates" : [ {
+    "name" : "Mookie Blaylock",
+    "code" : "",
+    "excluded" : false
+  }, {
+    "name" : "Yinka Dare",
+    "code" : "",
+    "excluded" : false
+  }, {
+    "name" : "Sedale Threatt",
+    "code" : "",
+    "excluded" : false
+  }, {
+    "name" : "George Gervin",
+    "code" : "",
+    "excluded" : false
+  } ],
+  "rules" : {
+    "tiebreakMode": "stopCountingAndAsk",
+    "overvoteRule": "alwaysSkipToNextRank",
+    "winnerElectionMode": "singleWinnerMajority",
+    "randomSeed": "",
+    "numberOfWinners": "1",
+    "decimalPlacesForVoteArithmetic": "4",
+    "minimumVoteThreshold": "0",
+    "maxSkippedRanksAllowed": "0",
+    "maxRankingsAllowed": "3",
+    "nonIntegerWinningThreshold": false,
+    "hareQuota": false,
+    "batchElimination": true,
+    "exhaustOnDuplicateCandidate": false,
+    "rulesDescription": "Doyle Rules"
+  }
+}