Bug 1602881 - [5.1] Add Login Storage Fetch API test. r=geckoview-reviewers,snorp

Differential Revision: https://phabricator.services.mozilla.com/D57355

--HG--
extra : moz-landing-system : lando

mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/LoginStorageDelegateTest.kt

@@ -0,0 +1,60 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
+ * Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+package org.mozilla.geckoview.test
+
+import android.support.test.filters.MediumTest
+import android.support.test.runner.AndroidJUnit4
+
+import org.hamcrest.Matchers.*
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.mozilla.geckoview.GeckoResult
+import org.mozilla.geckoview.LoginStorage
+import org.mozilla.geckoview.LoginStorage.LoginEntry
+import org.mozilla.geckoview.test.rule.GeckoSessionTestRule.AssertCalled
+import org.mozilla.geckoview.test.rule.GeckoSessionTestRule.WithDisplay
+
+
+@RunWith(AndroidJUnit4::class)
+@MediumTest
+class LoginStorageDelegateTest : BaseSessionTest() {
+
+    @Test fun fetchLogins() {
+        sessionRule.setPrefsUntilTestEnd(mapOf(
+                "signon.rememberSignons" to true,
+                "signon.autofillForms.http" to true))
+
+        val runtime = sessionRule.runtime;
+        val register = { delegate: LoginStorage.Delegate ->
+            runtime.loginStorageDelegate = delegate
+        }
+        val unregister = { _: LoginStorage.Delegate ->
+            runtime.loginStorageDelegate = null
+        }
+
+        val fetchHandled = GeckoResult<Void>()
+
+        sessionRule.addExternalDelegateDuringNextWait(
+            LoginStorage.Delegate::class, register, unregister,
+            object : LoginStorage.Delegate {
+                @AssertCalled(count = 1)
+                override fun onLoginFetch(domain: String)
+                        : GeckoResult<Array<LoginEntry>>? {
+                    assertThat(
+                        "Domain should match",
+                        domain,
+                        equalTo("localhost"))
+
+                    fetchHandled.complete(null);
+                    return null
+                }
+            })
+
+        mainSession.loadTestPath(FORMS_HTML_PATH)
+        sessionRule.waitForResult(fetchHandled)
+    }
+}