First cut of a stateful testing framework (it's pretty hacky at the moment, but all the pieces are there)

1 files changed, 88 insertions, 0 deletions

diff --git a/src/test/java/au/id/zancanaro/javacheck/statem/QueueTest.java b/src/test/java/au/id/zancanaro/javacheck/statem/QueueTest.java
new file mode 100644
index 0000000..4cd6345
--- /dev/null
+++ b/src/test/java/au/id/zancanaro/javacheck/statem/QueueTest.java
@@ -0,0 +1,88 @@
+package au.id.zancanaro.javacheck.statem;
+
+import au.id.zancanaro.javacheck.Generator;
+import au.id.zancanaro.javacheck.annotations.DataSource;
+import au.id.zancanaro.javacheck.annotations.Property;
+import au.id.zancanaro.javacheck.junit.Properties;
+import org.junit.runner.RunWith;
+
+import java.util.*;
+
+import static au.id.zancanaro.javacheck.Generator.pure;
+import static au.id.zancanaro.javacheck.Generators.integer;
+import static au.id.zancanaro.javacheck.Generators.oneOf;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+@RunWith(Properties.class)
+public class QueueTest {
+    private static final Queue<Integer> queue = new LinkedList<>();
+
+    @DataSource
+    public static Generator<CommandList<List<Integer>>> commandGenerator =
+            new CommandListGenerator<>(state -> oneOf(
+                    pure(new QueuePushCommand()),
+                    pure(new QueuePopCommand())
+            ));
+
+    @Property
+    public void test(CommandList<List<Integer>> commands) {
+        queue.clear();
+        CommandResult<List<Integer>> result = commands.run(null);
+        assertFalse(result.isFailed());
+    }
+
+    private static class QueuePushCommand extends Command<List<Integer>, Integer, Void> {
+        @Override
+        public Generator<Integer> argsGenerator(List<Integer> integers) {
+            return integer();
+        }
+
+        @Override
+        public Void runCommand(Integer integer) {
+            queue.offer(integer);
+            return null;
+        }
+
+        @Override
+        public List<Integer> nextState(List<Integer> integers, Integer integer, CommandValue<Void> result) {
+            List<Integer> nextState = new ArrayList<>(integers == null ? new ArrayList<>() : integers);
+            nextState.add(integer);
+            return nextState;
+        }
+
+        @Override
+        public String toString() {
+            return "push";
+        }
+    }
+
+    private static class QueuePopCommand extends Command<List<Integer>, Void, Integer> {
+        @Override
+        public boolean preCondition(List<Integer> integers, Void aVoid) {
+            return integers != null && !integers.isEmpty();
+        }
+
+        @Override
+        public Integer runCommand(Void aVoid) {
+            return queue.poll();
+        }
+
+        @Override
+        public boolean postCondition(List<Integer> oldState, List<Integer> newState, Void aVoid, Integer integer) {
+            return Objects.equals(integer, oldState.get(0));
+        }
+
+        @Override
+        public List<Integer> nextState(List<Integer> integers, Void aVoid, CommandValue<Integer> result) {
+            List<Integer> nextState = new ArrayList<>(integers == null ? new ArrayList<>() : integers);
+            nextState.remove(0);
+            return nextState;
+        }
+
+        @Override
+        public String toString() {
+            return "pop";
+        }
+    }
+}