NTV-572 :Migrate WebViewViewModel/DownloadBetaViewModel/HelpViewModel…

… related classes to kotlin (#1652)

* Rename .java to .kt

* Migrate Classes

* Add test cases

Co-authored-by: Isabel Martin <arkariang@gmail.com>

app/src/main/java/com/kickstarter/viewmodels/DownloadBetaViewModel.kt

@@ -0,0 +1,29 @@
+package com.kickstarter.viewmodels
+
+import com.kickstarter.libs.ActivityViewModel
+import com.kickstarter.libs.Environment
+import com.kickstarter.services.apiresponses.InternalBuildEnvelope
+import com.kickstarter.ui.IntentKey
+import com.kickstarter.ui.activities.DownloadBetaActivity
+import com.kickstarter.viewmodels.inputs.DownloadBetaViewModelInputs
+import com.kickstarter.viewmodels.outputs.DownloadBetaViewModelOutputs
+import rx.Observable
+import rx.subjects.BehaviorSubject
+
+class DownloadBetaViewModel(environment: Environment) :
+    ActivityViewModel<DownloadBetaActivity>(environment),
+    DownloadBetaViewModelInputs,
+    DownloadBetaViewModelOutputs {
+
+    val outputs: DownloadBetaViewModelOutputs = this
+    private val internalBuildEnvelope = BehaviorSubject.create<InternalBuildEnvelope>()
+
+    init {
+        intent()
+            .map<InternalBuildEnvelope> { it.getParcelableExtra(IntentKey.INTERNAL_BUILD_ENVELOPE) }
+            .ofType(InternalBuildEnvelope::class.java)
+            .compose(bindToLifecycle())
+            .subscribe(internalBuildEnvelope)
+    }
+    override fun internalBuildEnvelope(): Observable<InternalBuildEnvelope> = internalBuildEnvelope
+}

app/src/main/java/com/kickstarter/viewmodels/HelpViewModel.kt

@@ -0,0 +1,7 @@
+package com.kickstarter.viewmodels
+
+import com.kickstarter.libs.ActivityViewModel
+import com.kickstarter.libs.Environment
+import com.kickstarter.ui.activities.HelpActivity
+
+class HelpViewModel(environment: Environment) : ActivityViewModel<HelpActivity>(environment)

app/src/main/java/com/kickstarter/viewmodels/WebViewViewModel.kt

@@ -0,0 +1,50 @@
+package com.kickstarter.viewmodels
+
+import com.kickstarter.libs.ActivityViewModel
+import com.kickstarter.libs.Environment
+import com.kickstarter.ui.IntentKey
+import com.kickstarter.ui.activities.WebViewActivity
+import rx.Observable
+import rx.subjects.BehaviorSubject
+
+interface WebViewViewModel {
+    interface Outputs {
+        /** Emits a string to display in the toolbar. */
+        fun toolbarTitle(): Observable<String>
+
+        /** Emits a URL to load in the web view.  */
+        fun url(): Observable<String>
+    }
+
+    class ViewModel(environment: Environment) :
+        ActivityViewModel<WebViewActivity >(environment),
+        Outputs {
+
+        private val toolbarTitle = BehaviorSubject.create<String>()
+        private val url = BehaviorSubject.create<String>()
+
+        val outputs: Outputs = this
+
+        override fun toolbarTitle(): Observable<String> {
+            return toolbarTitle
+        }
+
+        override fun url(): Observable<String> {
+            return url
+        }
+
+        init {
+            intent()
+                .map { it.getStringExtra(IntentKey.TOOLBAR_TITLE) }
+                .ofType(String::class.java)
+                .compose(bindToLifecycle())
+                .subscribe { toolbarTitle.onNext(it) }
+
+            intent()
+                .map { it.getStringExtra(IntentKey.URL) }
+                .ofType(String::class.java)
+                .compose(bindToLifecycle())
+                .subscribe { url.onNext(it) }
+        }
+    }
+}

app/src/test/java/com/kickstarter/viewmodels/DownloadBetaViewModelTest.kt

@@ -0,0 +1,29 @@
+package com.kickstarter.viewmodels
+
+import android.content.Intent
+import com.kickstarter.KSRobolectricTestCase
+import com.kickstarter.services.apiresponses.InternalBuildEnvelope
+import com.kickstarter.ui.IntentKey
+import org.junit.Test
+import rx.observers.TestSubscriber
+
+class DownloadBetaViewModelTest : KSRobolectricTestCase() {
+
+    private lateinit var vm: DownloadBetaViewModel
+    private val internalBuildEnvelope = TestSubscriber<InternalBuildEnvelope>()
+
+    fun setUpEnvironment() {
+        vm = DownloadBetaViewModel(environment())
+        vm.outputs.internalBuildEnvelope().subscribe(internalBuildEnvelope)
+    }
+
+    @Test
+    fun testInternalBuildEnvelope() {
+        setUpEnvironment()
+
+        val internalEnvelope = InternalBuildEnvelope.builder().newerBuildAvailable(true).build()
+        vm.intent(Intent().putExtra(IntentKey.INTERNAL_BUILD_ENVELOPE, internalEnvelope))
+
+        internalBuildEnvelope.assertValueCount(1)
+    }
+}

app/src/test/java/com/kickstarter/viewmodels/WebViewViewModelTest.kt

@@ -0,0 +1,39 @@
+package com.kickstarter.viewmodels
+
+import android.content.Intent
+import com.kickstarter.KSRobolectricTestCase
+import com.kickstarter.libs.Environment
+import com.kickstarter.ui.IntentKey
+import org.junit.Test
+import rx.observers.TestSubscriber
+
+class WebViewViewModelTest : KSRobolectricTestCase() {
+    private lateinit var vm: WebViewViewModel.ViewModel
+    private val toolbarTitle = TestSubscriber<String>()
+    private val url = TestSubscriber<String>()
+
+    private fun setUpEnvironment(environment: Environment) {
+        vm = WebViewViewModel.ViewModel(environment)
+
+        vm.outputs.toolbarTitle().subscribe(toolbarTitle)
+        vm.outputs.url().subscribe(url)
+    }
+
+    @Test
+    fun testToolbarTitle() {
+        val toolbarTitle = "some body once told me"
+        setUpEnvironment(environment())
+
+        vm.intent(Intent().putExtra(IntentKey.TOOLBAR_TITLE, toolbarTitle))
+        this.toolbarTitle.assertValues(toolbarTitle)
+    }
+
+    @Test
+    fun testUrl() {
+        val url = "d.rip"
+        setUpEnvironment(environment())
+
+        vm.intent(Intent().putExtra(IntentKey.URL, url))
+        this.url.assertValues(url)
+    }
+}