Add initial ActionsEnv abstraction

src/testing-utils.ts

@@ -10,7 +10,7 @@ import test, {
 import nock from "nock";
 import * as sinon from "sinon";
 
-import { getActionVersion } from "./actions-util";
+import { ActionsEnv, getActionVersion } from "./actions-util";
 import { AnalysisKind } from "./analyses";
 import * as apiClient from "./api-client";
 import { GitHubApiDetails } from "./api-client";
@@ -172,6 +172,15 @@ export function makeMacro<Args extends unknown[]>(
   return wrapper;
 }
 
+/**
+ * Gets an `ActionsEnv` instance for use in tests.
+ */
+export function getTestActionsEnv(): ActionsEnv {
+  return {
+    getOptionalInput: () => undefined,
+  };
+}
+
 /**
  * Default values for environment variables typically set in an Actions
  * environment. Tests can override individual variables by passing them in the