test: redirect.ts tests

Author: Craig Doremus

framework/core/redirect_test.ts

@@ -0,0 +1,85 @@
+/**
+ * NOTE: This test needs the --location cli flag set
+ * see https://github.com/denoland/deno/blob/main/docs/runtime/location_api.md
+ * and explanation below.
+ */
+import { assertEquals } from 'std/testing/asserts.ts'
+import { redirect } from './redirect.ts'
+
+// mock history functions used in redirect()
+interface MockWindow extends Window {
+    history: {
+        replaceState: (state: object | null, title: string | '', url?: string) => void,
+        pushState: (state: object | null, title: string | '', url?: string) => void
+    }
+}
+declare let window: MockWindow
+
+// track calls to history functions
+const calls = {
+    pushCalls: 0, // tracks calls to pushState()
+    replaceCalls: 0 // tracks calls to replaceState()
+}
+// create mock history impl
+window.history = {
+    replaceState: (url) => { calls.replaceCalls++; return null },
+    pushState: (url) => { calls.pushCalls++; return null }
+}
+
+const resetCallCount = () => {
+    calls.pushCalls = 0
+    calls.replaceCalls = 0
+}
+
+Deno.test('redirect: replace=false should call history.pushState', () => {
+    const url = '/foo/bar.ts'
+
+    redirect(url)
+    assertEquals(calls.pushCalls, 1)
+    redirect(url)
+    assertEquals(calls.pushCalls, 2)
+    redirect(url)
+    assertEquals(calls.pushCalls, 3)
+
+    resetCallCount()
+})
+
+Deno.test('redirect: replace=true should call history.replaceState', () => {
+    const url = '/foo/bar2.ts'
+
+    redirect(url, true)
+    assertEquals(calls.replaceCalls, 1)
+    redirect(url, true)
+
+    assertEquals(calls.replaceCalls, 2)
+
+    resetCallCount()
+})
+
+Deno.test('redirect: empty string url should not call history methods', () => {
+    const url = ''
+
+    redirect(url)
+
+    assertEquals(calls.pushCalls, 0)
+    assertEquals(calls.replaceCalls, 0)
+
+})
+
+/**
+ * This fails because setting location.href is not allowed in a
+ * non-browser environment. see
+ * https://github.com/denoland/deno/blob/main/docs/runtime/location_api.md
+ * This errors out on line 12 of redirect().
+ */
+// Deno.test('redirect: file url should set location.href', () => {
+//     const url = 'file://foo/file.ts'
+
+//     redirect(url)
+
+//     assertEquals(window.location.href, url)
+//     assertEquals(calls.pushCalls, 0)
+//     assertEquals(calls.replaceCalls, 0)
+
+//     resetCallCount()
+// })