update: return non-0 exit code for compare w/changes

Closed reg-viz#505

Author: maniator

packages/reg-suit-cli/src/commands/compare.ts

@@ -4,7 +4,13 @@ import getRegCore from "../get-reg-core";
 async function compare(options: CliOptions) {
   const processor = getRegCore(options).createProcessor();
   const ctx = await processor.getExpectedKey();
-  await processor.compare(ctx);
+  const { comparisonResult } = await processor.compare(ctx);
+  const numberOfFailed = comparisonResult.failedItems.length;
+  
+  if (numberOfFailed) {
+    throw new Error(`There were ${numberOfFailed} failed snapshots`);
+  }
+  
   return null;
 }