test: add tests to path to package

src/commands/changed.ts

@@ -2,7 +2,7 @@ import { Command, flags } from "@oclif/command";
 import chalk from "chalk";
 
 import { findDiff } from "../changed/find-diff";
-import { pathToPackage } from "../changed/path-to-package";
+import { pathToPackage } from "../utils/path-to-package";
 import { readConfig } from "../changed/read-config";
 
 export default class Changed extends Command {

src/utils/path-to-package.test.ts

@@ -0,0 +1,37 @@
+import chalk from "chalk";
+import jsonfile from "jsonfile";
+import path from "path";
+
+import { pathToPackage } from "./path-to-package";
+
+describe("Path to package", () => {
+  afterEach(() => jest.restoreAllMocks());
+
+  test("Successful read", () => {
+    jest.spyOn(jsonfile, "readFileSync").mockImplementation(() => {
+      return { name: "Test Package" };
+    });
+
+    const names = pathToPackage([path.join("src", "test")]);
+    expect(names).toEqual(["Test Package"]);
+  });
+
+  test("Unsuccessful read", () => {
+    const result: any = [];
+    jest
+      .spyOn(process.stdout, "write")
+      .mockImplementation(val => result.push(String(val).trim()));
+
+    const names = pathToPackage([path.join("src", "test")]);
+    expect(names).toEqual([]);
+    expect(result).toEqual([
+      chalk.red(
+        `${path.join(
+          "src",
+          "test",
+          "package.json"
+        )} may have been removed. Not publishing.`
+      ),
+    ]);
+  });
+});