feat: log the reason a request failed when errors are not fatal

.changeset/warn-failed-requests.md

@@ -0,0 +1,5 @@
+---
+"@slack/slack-github-action": minor
+---
+
+feat: log a warning with the reason a request failed when the "errors" option is not true

docs/additional-configurations.md

@@ -6,7 +6,7 @@ There are some additional, possibly useful, customization options for workflows.
 
 Invalid API requests or unexpected webhook payloads cause a failing response that can be used to fail the GitHub Actions step with the `errors` option.
 
-The `errors` option defaults to `false` so failed requests do not cause the step to fail. This result can still be gathered from the `ok` output.
+The `errors` option defaults to `false` so failed requests log a warning but don't cause the step to fail. The step's result can still be gathered from the `ok` output.
 
 ```yaml
 - name: Attempt to call an unknown method

src/send.js

@@ -19,6 +19,7 @@ export default async function send(core) {
       core.setFailed(error);
       throw new SlackError(core, error);
     }
+    core.warning(`Failed to send the request: ${error.message}`);
   }
 }
 

test/send.spec.js

@@ -1,5 +1,6 @@
 import assert from "node:assert";
 import { beforeEach, describe, it } from "node:test";
+import webapi from "@slack/web-api";
 import send from "../src/send.js";
 import { mocks } from "./index.spec.js";
 
@@ -75,4 +76,45 @@ describe("send", () => {
       assert.ok(mocks.core.setOutput.getCall(2).lastArg >= 0);
     });
   });
+
+  describe("logging", async () => {
+    it("warns of the failed request when errors are not fatal", async () => {
+      mocks.core.getInput.withArgs("method").returns("chat.postMessage");
+      mocks.core.getInput.withArgs("token").returns("xoxb-example");
+      mocks.core.getInput.withArgs("payload").returns('"text": "hello"');
+      mocks.calls.rejects(
+        new webapi.WebAPIPlatformError({ ok: false, error: "invalid_auth" }),
+      );
+      await send(mocks.core);
+      assert.strictEqual(mocks.core.setFailed.called, false);
+      assert.equal(mocks.core.warning.getCalls().length, 1);
+      assert.match(mocks.core.warning.getCall(0).firstArg, /invalid_auth/);
+    });
+
+    it("warns of the failed webhook when errors are not fatal", async () => {
+      mocks.core.getInput
+        .withArgs("webhook")
+        .returns("https://hooks.slack.com");
+      mocks.core.getInput.withArgs("webhook-type").returns("webhook-trigger");
+      mocks.core.getInput.withArgs("payload").returns('"greetings": "hello"');
+      mocks.webhook.trigger.rejects(new Error("invalid_payload"));
+      await send(mocks.core);
+      assert.strictEqual(mocks.core.setFailed.called, false);
+      assert.equal(mocks.core.warning.getCalls().length, 1);
+      assert.match(mocks.core.warning.getCall(0).firstArg, /invalid_payload/);
+    });
+
+    it("fails the step without warning when errors are fatal", async () => {
+      mocks.core.getBooleanInput.withArgs("errors").returns(true);
+      mocks.core.getInput.withArgs("method").returns("chat.postMessage");
+      mocks.core.getInput.withArgs("token").returns("xoxb-example");
+      mocks.core.getInput.withArgs("payload").returns('"text": "hello"');
+      mocks.calls.rejects(
+        new webapi.WebAPIPlatformError({ ok: false, error: "invalid_auth" }),
+      );
+      await assert.rejects(send(mocks.core));
+      assert.ok(mocks.core.setFailed.called);
+      assert.strictEqual(mocks.core.warning.called, false);
+    });
+  });
 });