test case added for GetProductsListUseCase

app/src/test/java/com/hieuwu/groceriesstore/domain/usecases/impl/GetProductsListUseCaseImplTest.kt

@@ -0,0 +1,68 @@
+package com.hieuwu.groceriesstore.domain.usecases.impl
+
+import com.hieuwu.groceriesstore.data.repository.ProductRepository
+import com.hieuwu.groceriesstore.domain.models.ProductModel
+import com.hieuwu.groceriesstore.domain.usecases.GetProductsListUseCase
+import junit.framework.TestCase.assertEquals
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.runBlocking
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mockito.Mock
+import org.mockito.junit.MockitoJUnitRunner
+import org.mockito.kotlin.whenever
+
+@RunWith(MockitoJUnitRunner::class)
+
+class GetProductsListUseCaseImplTest {
+
+    @Mock
+    lateinit var mockedProductsRepository: ProductRepository
+
+    private lateinit var testee: GetProductsListUseCase
+
+    @Before
+    fun setUp() {
+        testee = GetProductsListUseCaseImpl(
+            productRepository = mockedProductsRepository
+        )
+    }
+
+    @Test
+    fun givenProductsAvailable_whenExecute_thenReturnCorrectValue() {
+        val mockedProducts = listOf(
+            ProductModel(id = "1", name = "Apple", price = 1.0, image = "image1.jpg", description = "Fruit", nutrition = "Healthy"),
+            ProductModel(id = "2", name = "Fries", price = 5.0, image = "image2.jpg", description = "Junk food", nutrition = "Unhealthy"),
+            ProductModel(id = "3", name = "Potato", price = 10.0, image = "image3.jpg", description = "Vegetable", nutrition = "Healthy"),
+        )
+        whenever(mockedProductsRepository.products).thenReturn(flow {
+            emit(mockedProducts)
+        })
+        runBlocking {
+            val result = testee.execute(GetProductsListUseCase.Input())
+
+            result.result.collect { products ->
+                assertEquals(mockedProducts[0], products[0])
+                assertEquals(mockedProducts[1], products[1])
+                assertEquals(mockedProducts[2], products[2])
+                assertEquals(mockedProducts[1].name, "Fries")
+            }
+        }
+    }
+
+    @Test
+    fun givenProductsUnavailable_whenExecute_thenReturnCorrectValue() {
+        whenever(mockedProductsRepository.products).thenReturn(flow {
+            emit(listOf())
+        })
+
+        runBlocking {
+            val result = testee.execute(GetProductsListUseCase.Input())
+            result.result.collect {
+                assertEquals(it.isEmpty(), true)
+            }
+        }
+    }
+
+}