respect update fixtures flag

Author: josharian

packages/cursorless-engine/src/core/hatStats.test.ts

@@ -8,6 +8,7 @@ import {
   TokenHat,
   TokenHatSplittingMode,
   getCursorlessRepoRoot,
+  shouldUpdateFixtures,
 } from "@cursorless/common";
 import * as fs from "fs";
 import { unitTestSetup } from "../test/unitTestSetup";
@@ -18,6 +19,7 @@ import {
   RankedToken,
   getRankedTokens,
 } from "../util/allocateHats/getRankedTokens";
+import assert = require("assert");
 
 // We use special hat "colors"/"shapes" for nice ASCII art output.
 const HAT_COLORS = ["default", ..."ABCDEF"];
@@ -137,7 +139,13 @@ suite("hatStats", () => {
 
         if (index === 0) {
           const golden = goldenHatFile(contents, allTokens, tokenHat);
-          fs.writeFileSync(filepath + ".golden", golden);
+          const goldenPath = filepath + ".golden";
+          if (shouldUpdateFixtures()) {
+            fs.writeFileSync(goldenPath, golden);
+          } else {
+            const actual = fs.readFileSync(goldenPath, "utf-8");
+            assert.equal(actual, golden);
+          }
         }
 
         nHats.push((100 * tokenHat.length) / allTokens.length);
@@ -164,7 +172,13 @@ suite("hatStats", () => {
       s += describeDistribution("nPenalty2", nPenalty2) + "\n";
       // replace multiple trailing newlines with just one to placate pre-commit
       s = s.replace(/\n+$/, "\n");
-      fs.writeFileSync(filepath + ".stats", s);
+      const statsPath = filepath + ".stats";
+      if (shouldUpdateFixtures()) {
+        fs.writeFileSync(filepath + ".stats", s);
+      } else {
+        const actual = fs.readFileSync(statsPath, "utf-8");
+        assert.equal(actual, s);
+      }
     });
   });
 });