Merge pull request #65 from jmesnil/63_multi_value_collection

[#63] A multi-value config get operation

implementation/src/test/java/io/smallrye/config/MultiValueTestCase.java

@@ -0,0 +1,60 @@
+package io.smallrye.config;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Properties;
+import java.util.Set;
+import java.util.TreeSet;
+
+import org.eclipse.microprofile.config.Config;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+public class MultiValueTestCase {
+
+    SmallRyeConfig config;
+
+    @Before
+    public void setUp() {
+        Properties properties = new Properties();
+        properties.put("my.pets", "snake,dog,cat,cat");
+
+        config = (SmallRyeConfig)SmallRyeConfigProviderResolver.instance().getBuilder()
+                .withSources(new PropertiesConfigSource(properties, "my properties"))
+                .build();
+    }
+
+    @Test
+    public void testGetValuesAsList() {
+        List<String> pets = config.getValues("my.pets", String.class, ArrayList::new);
+        assertNotNull(pets);
+        assertEquals(4, pets.size());
+        assertEquals(pets, Arrays.asList("snake", "dog", "cat", "cat"));
+    }
+
+    @Test
+    public void testGetValuesAsSet() {
+        Set<String> pets = config.getValues("my.pets", String.class, HashSet::new);
+        assertNotNull(pets);
+        assertEquals(3, pets.size());
+        assertTrue(pets.contains("snake"));
+        assertTrue(pets.contains("dog"));
+        assertTrue(pets.contains("cat"));
+    }
+
+    @Test
+    public void testGetValuesAsSortedSet() {
+        Set<String> pets = config.getValues("my.pets", String.class, s -> new TreeSet<>(String.CASE_INSENSITIVE_ORDER));
+        assertNotNull(pets);
+        assertEquals(3, pets.size());
+        assertEquals(new ArrayList(pets),  Arrays.asList("cat", "dog", "snake"));
+    }
+}