add unit tests for android kvs

Author: wenxi-zeng

android/src/test/java/com/segment/analytics/kotlin/android/utilities/AndroidKVSTest.kt

@@ -0,0 +1,44 @@
+package com.segment.analytics.kotlin.android.utilities
+
+import com.segment.analytics.kotlin.android.utils.MemorySharedPreferences
+import com.segment.analytics.kotlin.core.utilities.KVS
+import org.junit.jupiter.api.Assertions
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+
+class AndroidKVSTest {
+
+    private lateinit var prefs: KVS
+
+    @BeforeEach
+    fun setup(){
+        val sharedPreferences = MemorySharedPreferences()
+        prefs = AndroidKVS(sharedPreferences)
+        prefs.put("int", 1)
+        prefs.put("string", "string")
+    }
+
+    @Test
+    fun getTest() {
+        Assertions.assertEquals(1, prefs.get("int", 0))
+        Assertions.assertEquals("string", prefs.get("string", null))
+        Assertions.assertEquals(0, prefs.get("keyNotExists", 0))
+        Assertions.assertEquals(null, prefs.get("keyNotExists", null))
+    }
+
+    @Test
+    fun putTest() {
+        prefs.put("int", 2)
+        prefs.put("string", "stringstring")
+
+        Assertions.assertEquals(2, prefs.get("int", 0))
+        Assertions.assertEquals("stringstring", prefs.get("string", null))
+    }
+
+    @Test
+    fun containsAndRemoveTest() {
+        Assertions.assertTrue(prefs.contains("int"))
+        prefs.remove("int")
+        Assertions.assertFalse(prefs.contains("int"))
+    }
+}

core/src/test/kotlin/com/segment/analytics/kotlin/core/utilities/KVSTest.kt

@@ -19,10 +19,6 @@ class KVSTest {
 
         @Test
         fun getTest() {
-            val keyNotExists = "keyNotExists"
-            val expectedInt = 100
-            val expectedString = "string"
-
             assertEquals(1, prefs.get("int", 0))
             assertEquals("string", prefs.get("string", null))
             assertEquals(0, prefs.get("keyNotExists", 0))