optional orelse optional ex

2018-05-27 15:42:59 +03:00
parent 146c1bb2a9
commit ca9f1bbc42
3 changed files with 83 additions and 0 deletions
@@ -0,0 +1,51 @@
+package com.baeldung.optionals;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.Optional;
+
+import org.junit.Test;
+
+public class OptionalsTest {
+
+    @Test
+    public void givenOptional_whenEmptyValue_thenCustomMessage() {
+        assertEquals(Optional.of("Name not provided"), Optionals.getName(Optional.ofNullable(null)));
+    }
+
+    @Test
+    public void givenOptional_whenValue_thenOptional() {
+        String name = "Filan Fisteku";
+        Optional<String> optionalString = Optional.ofNullable(name);
+        assertEquals(optionalString, Optionals.getName(optionalString));
+    }
+    
+    @Test
+    public void givenOptional_whenValue_thenOptionalGeneralMethod() {
+        String name = "Filan Fisteku";
+        String missingOptional = "Name not provided";
+        Optional<String> optionalString = Optional.ofNullable(name);
+        Optional<String> fallbackOptionalString = Optional.ofNullable(missingOptional);
+        assertEquals(optionalString, Optionals.or(optionalString, fallbackOptionalString));
+    }
+    
+    @Test
+    public void givenEmptyOptional_whenValue_thenOptionalGeneralMethod() {
+        String missingOptional = "Name not provided";
+        Optional<String> optionalString = Optional.empty();
+        Optional<String> fallbackOptionalString = Optional.ofNullable(missingOptional);
+        assertEquals(fallbackOptionalString, Optionals.or(optionalString, fallbackOptionalString));
+    }
+
+    @Test
+    public void givenGuavaOptional_whenInvoke_thenOptional() {
+        String name = "Filan Fisteku";
+        com.google.common.base.Optional<String> stringOptional = com.google.common.base.Optional.of(name);
+        assertEquals(stringOptional, Optionals.getOptionalGuavaName(stringOptional));
+    }
+
+    @Test
+    public void givenGuavaOptional_whenNull_thenDefaultText() {
+        assertEquals(com.google.common.base.Optional.of("Name not provided"), Optionals.getOptionalGuavaName(com.google.common.base.Optional.fromNullable(null)));
+    }
+}