Test Coverage for AtomicCountProcedure - Closes #988

Signed-off-by: hongliu2020 <hong.liu@bnymellon.com>

unit-tests/src/test/java/org/eclipse/collections/impl/block/procedure/AtomicCountProcedureTest.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2020 The Bank of New York Mellon and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and Eclipse Distribution License v. 1.0 which accompany this distribution.
+ * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
+ * and the Eclipse Distribution License is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ */
+
+package org.eclipse.collections.impl.block.procedure;
+
+import org.eclipse.collections.impl.list.Interval;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class AtomicCountProcedureTest
+{
+    private static final int STRING_LENGTH = 5;
+    private static final int ZERO = 0;
+
+    @Test
+    public void getCount()
+    {
+        AtomicCountProcedure<String> atomicCountProcedure = new AtomicCountProcedure<>(each -> STRING_LENGTH < each.length());
+
+        atomicCountProcedure.value("word");
+        assertEquals(0,  atomicCountProcedure.getCount());
+
+        atomicCountProcedure.value("america");
+        assertEquals(1, atomicCountProcedure.getCount());
+    }
+
+    @Test(expected = ArithmeticException.class)
+    public void predicateException()
+    {
+        AtomicCountProcedure<String> atomicCountProcedure = new AtomicCountProcedure<>(each -> STRING_LENGTH < each.length() / ZERO);
+
+        atomicCountProcedure.value("word");
+    }
+
+    @Test
+    public void parallelProcessing()
+    {
+        AtomicCountProcedure<Integer> atomicCountProcedure = new AtomicCountProcedure<>(each -> each % 2 == 0);
+
+        Interval.oneTo(50_000)
+                .parallelStream()
+                .forEach(atomicCountProcedure);
+
+        assertEquals(25_000, atomicCountProcedure.getCount());
+    }
+}