Adding tests for loadCJSON (#9556)

* Adding tests for loadCJSON

* Update src/loadCJSON.spec.ts

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Format

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: joehan

src/loadCJSON.spec.ts

@@ -0,0 +1,30 @@
+import { expect } from "chai";
+import * as path from "path";
+import { loadCJSON } from "./loadCJSON";
+import { FirebaseError } from "./error";
+
+describe("loadCJSON", () => {
+  const fixturesDir = path.join(__dirname, "test", "fixtures", "loadCJSON");
+
+  it("should return parsed JSON on success", () => {
+    const filePath = path.join(fixturesDir, "valid.cjson");
+    const result = loadCJSON(filePath);
+    expect(result).to.deep.equal({ key: "value" });
+  });
+
+  it("should throw FirebaseError on ENOENT", () => {
+    const filePath = path.join(fixturesDir, "nonexistent.cjson");
+    expect(() => loadCJSON(filePath)).to.throw(
+      FirebaseError,
+      "File " + filePath + " does not exist",
+    );
+  });
+
+  it("should throw FirebaseError on parse error", () => {
+    const filePath = path.join(fixturesDir, "invalid.cjson");
+    expect(() => loadCJSON(filePath)).to.throw(
+      FirebaseError,
+      new RegExp(`Parse Error in ${filePath}`),
+    );
+  });
+});

src/test/fixtures/loadCJSON/invalid.cjson

@@ -0,0 +1,2 @@
+{
+    "key": "value" // Missing closing brace

src/test/fixtures/loadCJSON/valid.cjson

@@ -0,0 +1,4 @@
+{
+    // This is a comment
+    "key": "value"
+}