added GH action workflow to run unit tests

.github/workflows/build.yml

@@ -0,0 +1,29 @@
+name: Run build
+
+on:
+  push:
+    branches:
+      - '*'
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v3
+
+      - name: Gradle Wrapper Validation
+        uses: gradle/[email protected]
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+
+      - name: Run build
+        run:  ./gradlew -p compose-pay-button build # use connectedCheck in the future

app/src/main/java/com/example/composepaybutton/MainActivity.kt

@@ -78,7 +78,7 @@ class MainActivity : ComponentActivity() {
                     Text("default")
 
                     // Default
-                    PayButton(onClick = onClick, allowedPaymentMethods = allowedPaymentMethods)
+                    PayButton(onClick = onClick, allowedPaymentMethods = "")
 
                     Divider(thickness = 1.dp, color = Color.LightGray)
                     Text("customized look")

compose-pay-button/build.gradle

@@ -67,4 +67,10 @@ dependencies {
     implementation "androidx.compose.ui:ui:$compose_ui_version"
     implementation 'androidx.compose.material:material:1.5.4'
     implementation 'androidx.core:core-ktx:1.12.0'
+
+    androidTestImplementation("androidx.compose.ui:ui-test-junit4:$compose_ui_version")
+    androidTestImplementation('androidx.test.espresso:espresso-core:3.5.1')
+    androidTestImplementation('androidx.test:runner:1.5.2')
+    androidTestImplementation('androidx.test:rules:1.5.0')
+    debugImplementation("androidx.compose.ui:ui-test-manifest:$compose_ui_version")
 }

compose-pay-button/src/androidTest/java/com/google/pay/button/PayButtonTest.kt

@@ -0,0 +1,83 @@
+package com.google.pay.button
+
+import androidx.activity.ComponentActivity
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.test.assertIsDisplayed
+import androidx.compose.ui.test.assertIsNotDisplayed
+import androidx.compose.ui.test.junit4.createAndroidComposeRule
+import androidx.compose.ui.test.onNodeWithTag
+import androidx.test.espresso.Espresso
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.ViewMatchers.isDisplayed
+import androidx.test.espresso.matcher.ViewMatchers.withText
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+const val GOOGLE_PAY_BUTTON_TEST_TAG = "google-pay-button"
+
+@RunWith(AndroidJUnit4::class)
+class GooglePayButtonTest {
+
+    private var allowedPaymentMethods = "";
+
+    @get:Rule
+    val composeTestRule = createAndroidComposeRule<ComponentActivity>()
+
+    @Before
+    fun setup() {
+        allowedPaymentMethods = """
+            [
+              {
+                "type": "CARD",
+                "parameters": {
+                  "allowedAuthMethods": ["PAN_ONLY", "CRYPTOGRAM_3DS"],
+                  "allowedCardNetworks": ["AMEX", "DISCOVER", "JCB", "MASTERCARD", "VISA"]
+                },
+                "tokenizationSpecification": {
+                  "type": "PAYMENT_GATEWAY",
+                  "parameters": {
+                    "gateway": "example",
+                    "gatewayMerchantId": "exampleGatewayMerchantId"
+                  }
+                }
+              }
+            ]
+        """.trimIndent()
+    }
+
+    @Test
+    fun testButtonNotDisplayedForEmptyAllowedPaymentMethods() {
+        composeTestRule.setContent {
+           PayButton(
+               onClick = {},
+               allowedPaymentMethods = "",
+               modifier = Modifier.testTag(GOOGLE_PAY_BUTTON_TEST_TAG))
+        }
+        composeTestRule.onNodeWithTag(GOOGLE_PAY_BUTTON_TEST_TAG).assertIsNotDisplayed()
+    }
+
+    @Test
+    fun testButtonDisplayedAndEnabled() {
+        composeTestRule.setContent {
+            PayButton(
+                onClick = { println("Button clicked") },
+                allowedPaymentMethods = allowedPaymentMethods,
+                type = ButtonType.Book,
+                enabled = true,
+                modifier = Modifier.testTag(GOOGLE_PAY_BUTTON_TEST_TAG))
+        }
+
+        composeTestRule.onNodeWithTag(GOOGLE_PAY_BUTTON_TEST_TAG).assertIsDisplayed()
+        Espresso.onView(withText("Book with ")).check(matches(isDisplayed()))
+
+        // TODO - the following assertions do not work for some reason
+        //composeTestRule.onNodeWithTag(GOOGLE_PAY_BUTTON_TEST_TAG).assertHasClickAction()
+        // if we would set enabled = false
+        //composeTestRule.onNodeWithTag(GOOGLE_PAY_BUTTON_TEST_TAG).assertIsNotEnabled()
+    }
+
+}