Added tests for ThreadSafeBooleanChangeLock

shared/src/test/java/org/odk/collect/shared/locks/ThreadSafeBooleanChangeLockTest.kt

@@ -0,0 +1,67 @@
+package org.odk.collect.shared.locks
+
+import org.hamcrest.CoreMatchers.equalTo
+import org.hamcrest.MatcherAssert.assertThat
+import org.junit.Test
+
+class ThreadSafeBooleanChangeLockTest {
+    private val changeLock = ThreadSafeBooleanChangeLock()
+
+    @Test
+    fun `tryLock acquires the lock if it is no acquired`() {
+        val acquired = changeLock.tryLock()
+
+        assertThat(acquired, equalTo(true))
+    }
+
+    @Test
+    fun `tryLock does not acquire the lock if it is already acquired`() {
+        changeLock.tryLock()
+        val acquired = changeLock.tryLock()
+
+        assertThat(acquired, equalTo(false))
+    }
+
+    @Test
+    fun `unlock releases the lock`() {
+        changeLock.tryLock()
+        changeLock.unlock()
+        val acquired = changeLock.tryLock()
+
+        assertThat(acquired, equalTo(true))
+    }
+
+    @Test
+    fun `withLock acquires the lock if it is no acquired`() {
+        changeLock.withLock { acquired ->
+            assertThat(acquired, equalTo(true))
+        }
+    }
+
+    @Test
+    fun `withLock does not acquire the lock if it is already acquired`() {
+        changeLock.tryLock()
+        changeLock.withLock { acquired ->
+            assertThat(acquired, equalTo(false))
+        }
+    }
+
+    @Test
+    fun `withLock releases the lock after performing the job`() {
+        changeLock.withLock {}
+
+        val acquired = changeLock.tryLock()
+
+        assertThat(acquired, equalTo(true))
+    }
+
+    @Test
+    fun `withLock does not release the lock it it was not able to acquire it`() {
+        changeLock.tryLock()
+        changeLock.withLock {}
+
+        val acquired = changeLock.tryLock()
+
+        assertThat(acquired, equalTo(false))
+    }
+}