Add valueUpdatesOnly tests

app/src/test/java/gq/kirmanak/mealient/extensions/FlowExtensionsKtTest.kt

@@ -0,0 +1,42 @@
+package gq.kirmanak.mealient.extensions
+
+import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.flow.toList
+import kotlinx.coroutines.test.runTest
+import org.junit.Test
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class FlowExtensionsKtTest {
+
+    @Test
+    fun `when flow has an update then valueUpdatesOnly sends updated value`() = runTest {
+        val flow = flowOf(1, 2)
+        assertThat(flow.valueUpdatesOnly().toList()).isEqualTo(listOf(2))
+    }
+
+    @Test
+    fun `when flow has repeated values then valueUpdatesOnly sends updated value`() = runTest {
+        val flow = flowOf(1, 1, 1, 2)
+        assertThat(flow.valueUpdatesOnly().toList()).isEqualTo(listOf(2))
+    }
+
+    @Test
+    fun `when flow has one value then valueUpdatesOnly is empty`() = runTest {
+        val flow = flowOf(1)
+        assertThat(flow.valueUpdatesOnly().toList()).isEmpty()
+    }
+
+    @Test
+    fun `when flow has two updates then valueUpdatesOnly sends both`() = runTest {
+        val flow = flowOf(1, 2, 1)
+        assertThat(flow.valueUpdatesOnly().toList()).isEqualTo(listOf(2, 1))
+    }
+
+    @Test
+    fun `when flow has three updates then valueUpdatesOnly sends all`() = runTest {
+        val flow = flowOf(1, 2, 1, 3)
+        assertThat(flow.valueUpdatesOnly().toList()).isEqualTo(listOf(2, 1, 3))
+    }
+}