Add support to read dcf file from res/raw (#1778)

Add support in DesignSettings and DocServer to use R.raw.* Add unit test
for loading HelloWorld dcf file from res/raw Add test methods in
DesignSettings and DocServer
Add more steps to clear state in ClearStateTestRule

Test: ./gradlew designcompose:testDebugUnitTest# Please enter the commit
message for your changes. Lines starting

Author: dipenpradhan

designcompose/src/main/java/com/android/designcompose/DocServer.kt

@@ -16,11 +16,13 @@
 
 package com.android.designcompose
 
+import android.content.res.Resources
 import android.os.Handler
 import android.os.Looper
 import android.util.Log
 import android.widget.Toast
 import androidx.activity.ComponentActivity
+import androidx.annotation.RawRes
 import androidx.annotation.RestrictTo
 import androidx.annotation.VisibleForTesting
 import androidx.compose.runtime.Composable
@@ -39,6 +41,7 @@ import com.android.designcompose.common.DocumentServerParams
 import java.io.BufferedInputStream
 import java.io.File
 import java.io.FileInputStream
+import java.io.InputStream
 import java.lang.ref.WeakReference
 import java.net.ConnectException
 import java.net.SocketException
@@ -96,6 +99,11 @@ object DesignSettings {
     internal var isDocumentLive = mutableStateOf(false)
     private var fontDb: HashMap<String, FontFamily> = HashMap()
     internal var fileFetchStatus: HashMap<DesignDocId, DesignDocStatus> = HashMap()
+    internal var rawResourceId: Int = Resources.ID_NULL
+
+    @VisibleForTesting
+    @RestrictTo(RestrictTo.Scope.TESTS)
+    fun testOnlyClearFileFetchStatus() = fileFetchStatus.clear()
 
     @VisibleForTesting
     @RestrictTo(RestrictTo.Scope.TESTS)
@@ -149,6 +157,18 @@ object DesignSettings {
         toastsEnabled = false
     }
 
+    /**
+     * Sets the raw resource id for serialized doc. Once set, the design doc will only be read from
+     * res/raw/the_dcf_file. Live updates do not work when this is set. All other files will be
+     * ignored: downloaded/cached files, assets/figma/
+     *
+     * @param resourceId of the raw dcf file placed in res/raw
+     * @sample R.raw.the_dcf_file
+     */
+    fun setRawResourceId(@RawRes resourceId: Int) {
+        rawResourceId = resourceId
+    }
+
     fun addFontFamily(name: String, family: FontFamily) {
         fontDb[name] = family
     }
@@ -236,6 +256,10 @@ internal object DocServer {
                 scheduleLiveUpdate()
             }
         }
+
+    @VisibleForTesting
+    @RestrictTo(RestrictTo.Scope.TESTS)
+    fun testOnlyClearDocuments() = documents.clear()
 }
 
 internal fun DocServer.initializeLiveUpdate() {
@@ -508,9 +532,21 @@ internal fun DocServer.doc(
     }
 
     // Use the LocalContext to locate this doc in the precompiled DesignComposeDefinitionuments
-    val assetManager = context.assets
     try {
-        val assetDoc = assetManager.open("figma/$id.dcf")
+        val assetDoc: InputStream =
+            if (DesignSettings.rawResourceId != Resources.ID_NULL) {
+                Log.i(
+                    TAG,
+                    "Loaded design doc from R.raw." +
+                        context.resources.getResourceEntryName(DesignSettings.rawResourceId),
+                )
+                context.resources.openRawResource(DesignSettings.rawResourceId)
+            } else {
+                val fileName = "figma/$id.dcf"
+                Log.i(TAG, "Loaded design doc from assets/$fileName")
+                context.assets.open(fileName)
+            }
+
         val decodedDoc = decodeDiskDoc(assetDoc, null, docId, Feedback)
         if (decodedDoc != null) {
             synchronized(documents) { documents[docId] = decodedDoc }

designcompose/src/testDebug/kotlin/com/android/designcompose/DesignRawResourceTest.kt

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.designcompose
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.test.junit4.createComposeRule
+import androidx.compose.ui.test.onNodeWithText
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.android.designcompose.TestUtils.ClearStateTestRule
+import com.android.designcompose.annotation.Design
+import com.android.designcompose.annotation.DesignComponent
+import com.android.designcompose.annotation.DesignDoc
+import com.android.designcompose.test.R
+import com.android.designcompose.test.assertRenderStatus
+import com.android.designcompose.test.onDCDoc
+import com.github.takahirom.roborazzi.RobolectricDeviceQualifiers
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.annotation.Config
+import org.robolectric.annotation.GraphicsMode
+
+const val helloWorldDocId = "pxVlixodJqZL95zo2RzTHl"
+
+@DesignDoc(id = helloWorldDocId)
+interface HelloWorld {
+    @DesignComponent(node = "#MainFrame", hideDesignSwitcher = true)
+    fun mainFrame(@Design(node = "#Name") name: String)
+}
+
+@Composable
+fun HelloWorld() {
+    HelloWorldDoc.mainFrame(name = "Testers!")
+}
+
+@RunWith(AndroidJUnit4::class)
+@GraphicsMode(GraphicsMode.Mode.NATIVE)
+@Config(qualifiers = RobolectricDeviceQualifiers.SmallPhone, sdk = [34])
+class DesignRawResourceTest {
+    // Must reset the DocServer and DesignSettings state to prevent reusing cached files
+    @get:Rule val clearStateTestRule = ClearStateTestRule()
+    @get:Rule val composeTestRule = createComposeRule()
+
+    @Test
+    fun testHelloWorldDoc_setRawResourceId_passes() {
+        with(composeTestRule) {
+            DesignSettings.setRawResourceId(R.raw.raw_resource_test_hello_world_doc)
+            composeTestRule.setContent { HelloWorld() }
+
+            onDCDoc(HelloWorldDoc).assertRenderStatus(DocRenderStatus.Rendered)
+            onNodeWithText("Testers!", substring = true).assertExists()
+            onNodeWithText("Hello", substring = true).assertExists()
+        }
+    }
+
+    @Test
+    fun testHelloWorldDoc_noRawResource_fails() {
+        with(composeTestRule) {
+            composeTestRule.setContent { HelloWorld() }
+
+            onDCDoc(HelloWorldDoc).assertDoesNotExist()
+        }
+    }
+}

designcompose/src/testDebug/res/raw/raw_resource_test_hello_world_doc

@@ -18,6 +18,8 @@
 
 import static com.android.designcompose.TestUtilsKt.testOnlyTriggerLiveUpdate;
 
+import android.content.res.Resources;
+
 import androidx.test.platform.app.InstrumentationRegistry;
 
 import org.junit.rules.TestRule;
@@ -48,11 +50,23 @@ private static void clearInteractionStates() {
         InteractionStateManager.INSTANCE.getStates().clear();
     }
 
+    private static void clearDocServer() {
+        DocServer.INSTANCE.testOnlyClearDocuments();
+    }
+
+    private static void clearDesignSettings() {
+        DesignSettings.INSTANCE.testOnlyClearFileFetchStatus();
+        DesignSettings.INSTANCE.setRawResourceId(Resources.ID_NULL);
+    }
+
+
     public static class ClearStateTestRule implements TestRule {
 
         @Override
         public Statement apply(Statement base, Description description) {
             clearInteractionStates();
+            clearDocServer();
+            clearDesignSettings();
             return base;
         }
     }

designcompose/src/testFixtures/java/com/android/designcompose/TestUtils.java

@@ -59,11 +59,14 @@ function fetch_design_switcher {
 
 function fetch_helloworld {
     DOC_ID=pxVlixodJqZL95zo2RzTHl
+    OUTPUT_FILE_REFERENCE_APP="$GIT_ROOT/reference-apps/helloworld/helloworld-app/src/main/assets/figma/HelloWorldDoc_$DOC_ID.dcf"
+    OUTPUT_FILE_RAW_RES_TEST="$GIT_ROOT/designcompose/src/testDebug/res/raw/raw_resource_test_hello_world_doc"
     cargo run --bin fetch --features=fetch -- \
         --doc-id="$DOC_ID" \
         --nodes="#MainFrame" \
-        --output="$GIT_ROOT/reference-apps/helloworld/helloworld-app/src/main/assets/figma/HelloWorldDoc_$DOC_ID.dcf"
-
+        --output=$OUTPUT_FILE_REFERENCE_APP
+   # Reuse Hello World doc for testing doc loading from res/raw
+   cp $OUTPUT_FILE_REFERENCE_APP $OUTPUT_FILE_RAW_RES_TEST
 }
 
 function fetch_tutorial {
@@ -112,4 +115,5 @@ function fetch_state_customizations {
       --doc-id="$DOC_ID" \
       --nodes="#root" \
       --output="$GIT_ROOT/integration-tests/validation/src/main/assets/figma/StateCustomizationsDoc_$DOC_ID.dcf"
-}
+}
+