bugc: check each example's code digest in its own test

bin/check-changelog.test.ts

@@ -78,6 +78,15 @@ describe("needsChangelog", () => {
       ).toBe(false);
     });
 
+    it("ignores a test file's snapshots", () => {
+      expect(
+        needsChangelog(
+          ["packages/bugc/src/evmgen/__snapshots__/pairing.test.ts.snap"],
+          ["packages/bugc"],
+        ),
+      ).toBe(false);
+    });
+
     it("ignores an examples test suite", () => {
       expect(
         needsChangelog(

bin/check-changelog.ts

@@ -10,9 +10,9 @@
   return changedPaths.some((path) => path.startsWith("schemas/"));
 }
 
-// colocated test files carry no consumer-visible change, and this also
-// covers the *.examples.test.ts suites
-const testFile = /\.test\.tsx?$/;
+// colocated test files and their snapshots carry no consumer-visible
+// change, and this also covers the *.examples.test.ts suites
+const testFile = /\.test\.tsx?(\.snap)?$/;
 
 function touchesPackage(changedPaths: string[], prefix: string): boolean {
   return changedPaths.some(
@@ -188,7 +188,7 @@
   const base = argv[0] ?? defaultBase;
   const root = fileURLToPath(new URL("..", import.meta.url));
   if (!resolvesToCommit(root, base)) {
     console.error(
       `check-changelog: cannot resolve the base ref "${base}"; fetch it` +
         " first, or name one that exists.",
     );
@@ -207,10 +207,10 @@
     formatProblemsMessage(problems),
   ].filter((message) => message.length > 0);
   if (messages.length > 0) {
     console.error(messages.join("\n\n"));
     return 1;
   }
   console.log("changelog: ok");
   return 0;
 }