add specs for shouldPassThrough

Author: lipsumar

src/server/http-combo-server.ts

@@ -421,7 +421,7 @@ function analyzeAndMaybePassThroughTls(
     });
 }
 
-function shouldPassThrough(
+export function shouldPassThrough(
     hostname: string | undefined,
     // Only one of these two should have values (validated above):
     passThroughHostnames: string[],

test/http-combo-server.spec.ts

@@ -0,0 +1,50 @@
+import { shouldPassThrough } from "../src/server/http-combo-server";
+import { expect } from "./test-utils";
+
+describe("shouldPassThrough", () => {
+  it("should return false when passThroughHostnames is empty and interceptOnlyHostnames is undefined", async () => {
+    const should = shouldPassThrough("example.org", [], undefined);
+    expect(should).to.be.false;
+  });
+
+  it("should return true when both lists empty", async () => {
+    const should = shouldPassThrough("example.org", [], []);
+    expect(should).to.be.true;
+  });
+
+  it("should return false when hostname is falsy", () => {
+    const should = shouldPassThrough("", [], []);
+    expect(should).to.be.false;
+  });
+
+  describe("passThroughHostnames", () => {
+    it("should return true when hostname is in passThroughHostnames", () => {
+      const should = shouldPassThrough(
+        "example.org",
+        ["example.org"],
+        undefined
+      );
+      expect(should).to.be.true;
+    });
+
+    it("should return false when hostname is not in passThroughHostnames", () => {
+      const should = shouldPassThrough(
+        "example.org",
+        ["example.com"],
+        undefined
+      );
+      expect(should).to.be.false;
+    });
+  });
+  describe("interceptOnlyHostnames", () => {
+    it("should return false when hostname is in interceptOnlyHostnames", () => {
+      const should = shouldPassThrough("example.org", [], ["example.org"]);
+      expect(should).to.be.false;
+    });
+
+    it("should return true when hostname is not in interceptOnlyHostnames", () => {
+      const should = shouldPassThrough("example.org", [], ["example.com"]);
+      expect(should).to.be.true;
+    });
+  });
+});