Add passing tests

.github/workflows/test/arm-incremental-typespec-preview.test.js

@@ -0,0 +1,107 @@
+import { vol } from "memfs";
+import { join } from "path";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { createMockCore } from "../../test/mocks.js";
+import incrementalTypespec from "../src/arm-incremental-typespec-preview.js";
+import * as changedFiles from "../src/changed-files.js";
+import * as git from "../src/git.js";
+
+vi.mock("fs/promises", async () => {
+  const memfs = await import("memfs");
+  return {
+    ...memfs.fs.promises,
+  };
+});
+
+const core = createMockCore();
+
+const swaggerTypeSpecGenerated = JSON.stringify({
+  info: {
+    "x-typespec-generated": [{ emitter: "@azure-tools/typespec-autorest" }],
+  },
+});
+
+describe("incrementalTypeSpec", () => {
+  beforeEach(() => {
+    // TODO: Reset other global mocks like "core"
+    vol.reset();
+  });
+
+  it("rejects if inputs null", async () => {
+    await expect(incrementalTypespec({})).rejects.toThrow();
+  });
+
+  it("returns false if no changed RM files", async () => {
+    vi.spyOn(
+      changedFiles,
+      "getChangedResourceManagerSwaggerFiles",
+    ).mockResolvedValue([]);
+
+    await expect(incrementalTypespec({ core })).resolves.toBe(false);
+  });
+
+  it("returns false if a changed file is not typespec-generated", async () => {
+    const swaggerPath =
+      "/specification/contosowidgetmanager/resource-manager/Microsoft.Contoso/preview/2021-10-01-preview/contoso.json";
+
+    vi.spyOn(
+      changedFiles,
+      "getChangedResourceManagerSwaggerFiles",
+    ).mockResolvedValue([swaggerPath]);
+
+    vol.fromJSON({
+      [join(process.env.GITHUB_WORKSPACE || "", swaggerPath)]: '"foo"',
+    });
+
+    await expect(incrementalTypespec({ core })).resolves.toBe(false);
+  });
+
+  it("returns false if changed files add a new RP", async () => {
+    const swaggerPath =
+      "/specification/contosowidgetmanager2/resource-manager/Microsoft.Contoso/preview/2021-10-01-preview/contoso.json";
+
+    vi.spyOn(
+      changedFiles,
+      "getChangedResourceManagerSwaggerFiles",
+    ).mockResolvedValue([swaggerPath]);
+
+    vol.fromJSON({
+      [join(process.env.GITHUB_WORKSPACE || "", swaggerPath)]:
+        swaggerTypeSpecGenerated,
+    });
+
+    // "git ls-tree" returns "" if the spec folder doesn't exist in the base branch
+    vi.spyOn(git, "lsTree").mockResolvedValue("");
+
+    await expect(incrementalTypespec({ core })).resolves.toBe(false);
+  });
+
+  it("returns true if changed files are incremental changes to an existing TypeSpec RP", async () => {
+    const swaggerPath =
+      "/specification/contosowidgetmanager/resource-manager/Microsoft.Contoso/preview/2021-10-01-preview/contoso.json";
+
+    vi.spyOn(
+      changedFiles,
+      "getChangedResourceManagerSwaggerFiles",
+    ).mockResolvedValue([swaggerPath]);
+
+    vol.fromJSON({
+      [join(process.env.GITHUB_WORKSPACE || "", swaggerPath)]:
+        swaggerTypeSpecGenerated,
+    });
+
+    vi.spyOn(git, "lsTree").mockImplementation(
+      async (_treeIsh, _path, _core, options) => {
+        return options?.includes("-r --name-only")
+          ? swaggerPath.substring(1)
+          : "040000 tree abc123 specification/contosowidgetmanager";
+      },
+    );
+
+    vi.spyOn(git, "show").mockImplementation(async (_treeIsh, _path, _core) => {
+      return swaggerTypeSpecGenerated;
+    });
+
+    await expect(incrementalTypespec({ core })).resolves.toBe(true);
+  });
+});