1 files changed, 123 insertions, 0 deletions
diff --git a/app/src/test/kotlin/com/pitchedapps/frost/kotlin/FlyweightTest.kt b/app/src/test/kotlin/com/pitchedapps/frost/kotlin/FlyweightTest.kt
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+++ b/app/src/test/kotlin/com/pitchedapps/frost/kotlin/FlyweightTest.kt
@@ -0,0 +1,123 @@
+/*
+ * Copyright 2018 Allan Wang
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.pitchedapps.frost.kotlin
+
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.async
+import kotlinx.coroutines.runBlocking
+import org.junit.Rule
+import org.junit.rules.Timeout
+import java.util.concurrent.atomic.AtomicInteger
+import kotlin.test.BeforeTest
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+import kotlin.test.fail
+
+class FlyweightTest {
+
+    @get:Rule
+    val globalTimeout: Timeout = Timeout.seconds(5)
+
+    lateinit var flyweight: Flyweight<Int, Int>
+
+    lateinit var callCount: AtomicInteger
+
+    private val LONG_RUNNING_KEY = -78
+
+    @BeforeTest
+    fun before() {
+        callCount = AtomicInteger(0)
+        flyweight = Flyweight(GlobalScope, 100, 200L) {
+            callCount.incrementAndGet()
+            when (it) {
+                LONG_RUNNING_KEY -> Thread.sleep(100000)
+                else -> Thread.sleep(100)
+            }
+            it * 2
+        }
+    }
+
+    @Test
+    fun basic() {
+        assertEquals(2, runBlocking { flyweight.fetch(1) }, "Invalid result")
+        assertEquals(1, callCount.get(), "1 call expected")
+    }
+
+    @Test
+    fun multipleWithOneKey() {
+        val results: List<Int> = runBlocking {
+            (0..1000).map {
+                flyweight.scope.async {
+                    flyweight.fetch(1)
+                }
+            }.map { it.await() }
+        }
+        assertEquals(1, callCount.get(), "1 call expected")
+        assertEquals(1001, results.size, "Incorrect number of results returned")
+        assertTrue(results.all { it == 2 }, "Result should all be 2")
+    }
+
+    @Test
+    fun consecutiveReuse() {
+        runBlocking {
+            flyweight.fetch(1)
+            assertEquals(1, callCount.get(), "1 call expected")
+            flyweight.fetch(1)
+            assertEquals(1, callCount.get(), "Reuse expected")
+            Thread.sleep(300)
+            flyweight.fetch(1)
+            assertEquals(2, callCount.get(), "Refetch expected")
+        }
+    }
+
+    @Test
+    fun invalidate() {
+        runBlocking {
+            flyweight.fetch(1)
+            assertEquals(1, callCount.get(), "1 call expected")
+            flyweight.invalidate(1)
+            flyweight.fetch(1)
+            assertEquals(2, callCount.get(), "New call expected")
+        }
+    }
+
+    @Test
+    fun destroy() {
+        runBlocking {
+            val longRunningResult = async { flyweight.fetch(LONG_RUNNING_KEY) }
+            flyweight.fetch(1)
+            flyweight.cancel()
+            try {
+                flyweight.fetch(1)
+                fail("Flyweight should not be fulfilled after it is destroyed")
+            } catch (e: Exception) {
+                assertEquals("Flyweight is not active", e.message, "Incorrect error found on fetch after destruction")
+            }
+            try {
+                longRunningResult.await()
+                fail("Flyweight should have cancelled previously running requests")
+            } catch (e: Exception) {
+                assertEquals(
+                    "Flyweight cancelled",
+                    e.message,
+                    "Incorrect error found on fetch cancelled by destruction"
+                )
+            }
+        }
+    }
+}