Added Signup Activity Test (#4134)

app/src/test/kotlin/fr/free/nrw/commons/auth/SignupActivityTest.kt

@@ -0,0 +1,29 @@
+package fr.free.nrw.commons.auth
+
+import fr.free.nrw.commons.TestCommonsApplication
+import org.junit.Assert
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.Robolectric
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.annotation.Config
+
+
+@RunWith(RobolectricTestRunner::class)
+@Config(sdk = [21], application = TestCommonsApplication::class)
+class SignupActivityTest {
+
+    private lateinit var activity: SignupActivity
+
+    @Before
+    fun setUp() {
+        activity = Robolectric.buildActivity(SignupActivity::class.java).create().get()
+    }
+
+    @Test
+    @Throws(Exception::class)
+    fun checkActivityNotNull() {
+        Assert.assertNotNull(activity)
+    }
+}