Add sign-up button instrumentation test (#2687)

Author: madhurgupta10

app/src/androidTest/java/fr/free/nrw/commons/LoginActivityTest.kt

@@ -0,0 +1,36 @@
+package fr.free.nrw.commons
+
+import androidx.test.espresso.Espresso
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.assertion.ViewAssertions
+import androidx.test.espresso.intent.Intents
+import androidx.test.espresso.intent.Intents.intended
+import androidx.test.espresso.intent.matcher.IntentMatchers.hasComponent
+import androidx.test.espresso.matcher.ViewMatchers
+import androidx.test.espresso.matcher.ViewMatchers.withId
+import androidx.test.filters.LargeTest
+import androidx.test.rule.ActivityTestRule
+import androidx.test.runner.AndroidJUnit4
+import fr.free.nrw.commons.auth.LoginActivity
+import fr.free.nrw.commons.auth.SignupActivity
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@LargeTest
+@RunWith(AndroidJUnit4::class)
+class LoginActivityTest {
+    @get:Rule
+    var activity: ActivityTestRule<*> = ActivityTestRule(LoginActivity::class.java)
+
+    @Test
+    fun isSignUpButtonWorks() {
+        // Clicks the SignUp Button
+        Intents.init()
+        Espresso.onView(withId(R.id.signupButton))
+                .check(ViewAssertions.matches(ViewMatchers.isDisplayed()))
+                .perform(click())
+        intended(hasComponent(SignupActivity::class.java.name))
+        Intents.release()
+    }
+}