BAEL-6227: fluent interfaces code

2023-03-12 18:11:07 +01:00
parent 911df283d4
commit e958c942d4
10 changed files with 394 additions and 0 deletions
@@ -0,0 +1,101 @@
+package com.baeldung.fluentinterface;
+
+import com.baeldung.fluentinterface.components.*;
+import com.baeldung.fluentinterface.components.HtmlHeader.Type;
+import org.junit.jupiter.api.Test;
+
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static com.baeldung.fluentinterface.components.HtmlList.Type.ORDERED;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class FluentInterfaceUnitTest {
+
+	@Test
+	void givenTenNumbers_thenStreamIsProcessedCorrectly() {
+		Stream<Integer> numbers = Stream.of(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
+		Stream<String> processedNumbers = numbers.distinct()
+		  .filter(nr -> nr % 2 == 0)
+		  .skip(1)
+		  .limit(4)
+		  .map(nr -> "#" + nr)
+		  .peek(nr -> System.out.println(nr));
+		String result = processedNumbers.collect(Collectors.joining(", "));
+
+		assertThat(result).isEqualTo("#2, #4, #6, #8");
+	}
+
+	@Test
+	void givenUserBuilder_thenCreateUserCorrectly() {
+		User.Builder userBuilder = User.builder();
+		userBuilder = userBuilder
+		  .firstName("John")
+		  .lastName("Doe")
+		  .email("jd@gmail.com")
+		  .username("jd_2000")
+		  .id(1234L);
+
+		User user = userBuilder.build();
+
+		assertThat(user.name()).isEqualTo("John Doe");
+	}
+
+	@Test
+	void givenHtmlDocument_thenGenerateHtmlCorrectly() {
+		HtmlDocument document = new HtmlDocument()
+		  .header("Principles of O.O.P.")
+		  .paragraph("OOP in Java.")
+		  .horizontalLine()
+		  .paragraph("The main pillars of OOP are:")
+		  .orderedList("Encapsulation", "Inheritance", "Abstraction", "Polymorphism");
+		String html = document.html();
+
+		assertThat(html).isEqualToIgnoringWhitespace(
+		  "<html>"
+		  + "<h1>Principles of O.O.P.</h1>"
+		  + "<p>OOP in Java.</p>"
+		  + "<hr>"
+		  + "<p>The main pillars of OOP are:</p>"
+		  + "<ol>"
+		  + "<li>Encapsulation</li>"
+		  + "<li>Inheritance</li>"
+		  + "<li>Abstraction</li>"
+		  + "<li>Polymorphism</li>"
+		  + "</ol>"
+		  + "</html>"
+		);
+	}
+
+	@Test
+	void givenHtmlDocument_thenInstanceIsImmutable() {
+		HtmlDocument document = new HtmlDocument()
+		  .header("Principles of O.O.P.");
+		HtmlDocument updatedDocument = document
+		   .paragraph("OOP in Java.");
+
+		assertThat(document).isNotEqualTo(updatedDocument);
+	}
+
+
+	@Test
+	void givenLargeHtmlDocument_thenGenerateHtmlCorrectly() {
+		String html = new LargeHtmlDocument()
+		  .head(new HtmlHeader(Type.PRIMARY, "title"))
+		  .body(new HtmlDiv()
+			.append(new HtmlSpan()
+			  .paragraph("learning OOP from John Doe")
+			  .append(new HorizontalLine())
+			  .paragraph("The pillars of OOP:")
+			)
+			.append(new HtmlList(ORDERED, "Encapsulation", "Inheritance", "Abstraction", "Polymorphism"))
+		  )
+		  .footer(new HtmlDiv()
+			.paragraph("trademark John Doe")
+		  )
+		  .html();
+
+		String expectedHtml = "<html> <head><h1>title</h1></head> <body><div><span>learning OOP from John Doe<hr>The pillars of OOP:</span><ol><li>Encapsulation</li><li>Inheritance</li><li>Abstraction</li><li>Polymorphism</li></ol></div></body> <footer><div>trademark John Doe</div></footer></html>";
+		assertThat(html).isEqualToIgnoringWhitespace(expectedHtml);
+	}
+}