BAEL-7567 - How to convert List<T> to Flux<T> in Spring Reactor (#17106)

* BAEL-7567 - How to convert List<T> to Flux<T> in Spring Reactor (Adding Test cases)

* BAEL-7567 - How to convert List<T> to Flux<T> in Spring Reactor (modify test cases)

* BAEL-7567 - How to convert List<T> to Flux<T> in Spring Reactor (modify test cases)

Author: LordMaduz

reactor-core-2/src/test/java/com/baeldung/reactor/convertlistoflux/ListToFluxUnitTest.java

@@ -0,0 +1,51 @@
+package com.baeldung.reactor.convertlistoflux;
+
+import java.util.List;
+import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Flux;
+import reactor.test.StepVerifier;
+
+public class ListToFluxUnitTest {
+
+    @Test
+    public void givenList_whenCallingFromIterableOperator_thenListItemsTransformedAsFluxAndEmitted(){
+
+        List<Integer> list = List.of(1, 2,3);
+        Flux<Integer> flux = listToFluxUsingFromIterableOperator(list);
+
+        StepVerifier.create(flux)
+            .expectNext(1)
+            .expectNext(2)
+            .expectNext(3)
+            .expectComplete()
+            .verify();
+    }
+
+    @Test
+    public void givenList_whenCallingCreateOperator_thenListItemsTransformedAsFluxAndEmitted(){
+
+        List<Integer> list = List.of(1, 2,3);
+        Flux<Integer> flux = listToFluxUsingCreateOperator(list);
+
+        StepVerifier.create(flux)
+            .expectNext(1)
+            .expectNext(2)
+            .expectNext(3)
+            .expectComplete()
+            .verify();
+    }
+
+    private <T> Flux<T> listToFluxUsingFromIterableOperator(List<T> list) {
+        return Flux
+            .fromIterable(list)
+            .log();
+    }
+
+    private <T> Flux<T> listToFluxUsingCreateOperator(List<T> list) {
+        return Flux.create(sink-> {
+            list.forEach(sink::next);
+            sink.complete();
+        });
+    }
+
+}