Fix shm test failures on macOS

On macOS, the size of the allocated shared memory block might not
precisely match the request. But it needs to be at least as large as
the requested size. E.g.: sizes less than 16384 round up to 16384.

src/test/java/org/apposed/appose/SharedMemoryTest.java

@@ -41,6 +41,7 @@
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 /**
  * Tests {@link SharedMemory}.
@@ -54,7 +55,7 @@ public void testShmCreate() throws IOException {
 		int size = 456;
 		try (SharedMemory shm = SharedMemory.create(null, size)) {
 			assertNotNull(shm.name());
-			assertEquals(size, shm.size());
+			assertTrue(shm.size() >= size);
 			assertNotNull(shm.pointer());
 
 			// Modify the memory contents.
@@ -112,7 +113,7 @@ public void testShmAttach() throws IOException {
 		assertNotNull(shmName);
 		assertFalse(shmName.isEmpty());
 		int shmSize = Integer.parseInt(shmInfo[1]);
-		assertEquals(345, shmSize);
+		assertTrue(shmSize >= 345);
 
 		// Attach to the shared memory and verify it matches expectations.
 		try (SharedMemory shm = SharedMemory.attach(shmName, shmSize)) {

src/test/java/org/apposed/appose/TypesTest.java

@@ -70,7 +70,7 @@ public class TypesTest {
 			"\"shm\":{" +
 				"\"appose_type\":\"shm\"," +
 				"\"name\":\"SHM_NAME\"," +
-				"\"size\":4000" +
+				"\"size\":SHM_SIZE" +
 			"}" +
 		"}" +
 	"}";
@@ -110,7 +110,9 @@ public void testEncode() {
 			data.put("ndArray", ndArray);
 			String json = Types.encode(data);
 			assertNotNull(json);
-			String expected = JSON.replaceAll("SHM_NAME", ndArray.shm().name());
+			String expected = JSON
+				.replaceAll("SHM_NAME", ndArray.shm().name())
+				.replaceAll("SHM_SIZE", "" + ndArray.shm().size());
 			assertEquals(expected, json);
 		}
 	}
@@ -119,11 +121,16 @@ public void testEncode() {
 	public void testDecode() {
 		Map<String, Object> data;
 		String shmName;
+		int shmSize;
 
 		// Create name shared memory segment and decode JSON block.
 		try (SharedMemory shm = SharedMemory.create(null, 4000)) {
 			shmName = shm.name();
-			data = Types.decode(JSON.replaceAll("SHM_NAME", shmName));
+			shmSize = shm.size();
+			String json = JSON
+				.replaceAll("SHM_NAME", shmName)
+				.replaceAll("SHM_SIZE", "" + shmSize);
+			data = Types.decode(json);
 		}
 
 		// Validate results.
@@ -158,7 +165,7 @@ public void testDecode() {
 			assertEquals(20, ndArray.shape().get(1));
 			assertEquals(25, ndArray.shape().get(2));
 			assertEquals(shmName, ndArray.shm().name());
-			assertEquals(4000, ndArray.shm().size());
+			assertEquals(shmSize, ndArray.shm().size());
 		}
 	}