[JAVA-22519] Created new module libraries-stream and added 5 articles (#15403)

libraries-cli/src/test/java/com/baeldung/jcommander/helloworld/HelloWorldAppUnitTest.java

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+package com.baeldung.jcommander.helloworld;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+import com.beust.jcommander.JCommander;
+
+public class HelloWorldAppUnitTest {
+
+    @Test
+    public void whenJCommanderInvokedWithArgs_thenArgsParsed() {
+
+        HelloWorldArgs jArgs = new HelloWorldArgs();
+        JCommander helloCmd = JCommander
+          .newBuilder()
+          .addObject(jArgs)
+          .build();
+
+        // when
+        String[] argv = new String[] {
+          "--name", "JavaWorld"
+        };
+        helloCmd.parse(argv);
+
+        // then
+        assertEquals("JavaWorld", jArgs.getName());
+    }
+}

libraries-cli/src/test/java/com/baeldung/jcommander/usagebilling/cli/FetchCurrentChargesCommandUnitTest.java

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+package com.baeldung.jcommander.usagebilling.cli;
+
+import static org.hamcrest.collection.IsIterableContainingInOrder.contains;
+import static org.junit.Assert.assertThat;
+
+import org.junit.Test;
+
+import com.beust.jcommander.JCommander;
+
+public class FetchCurrentChargesCommandUnitTest {
+
+    private JCommander jc = JCommander.newBuilder()
+      .addObject(new FetchCurrentChargesCommand())
+      .build();
+
+    @Test
+    public void whenParsedMultipleSubscriptionsParameter_thenParameterSubscriptionsIsPopulated() {
+        FetchCurrentChargesCommand cmd = (FetchCurrentChargesCommand) jc
+          .getObjects()
+          .get(0);
+        
+        jc.parse(new String[] {
+          "-C", "cb898e7a-f2a0-46d2-9a09-531f1cee1839",
+          "-S", "subscriptionA001",
+          "-S", "subscriptionA002",
+          "-S", "subscriptionA003",
+        });
+
+        assertThat(cmd.getSubscriptionIds(),
+          contains("subscriptionA001", "subscriptionA002", "subscriptionA003"));
+    }
+
+    @Test
+    public void whenParsedSubscriptionsColonSeparatedParameter_thenParameterSubscriptionsIsPopulated() {
+        FetchCurrentChargesCommand cmd = (FetchCurrentChargesCommand) jc
+          .getObjects()
+          .get(0);
+
+        jc.parse(new String[] {
+          "-C", "cb898e7a-f2a0-46d2-9a09-531f1cee1839",
+          "-S", "subscriptionA001:subscriptionA002:subscriptionA003",
+        });
+
+        assertThat(cmd.getSubscriptionIds(), 
+          contains("subscriptionA001", "subscriptionA002", "subscriptionA003"));
+    }
+
+    @Test
+    public void whenParsedSubscriptionsWithVariableArity_thenParameterSubscriptionsIsPopulated() {
+        FetchCurrentChargesCommand cmd = (FetchCurrentChargesCommand) jc
+          .getObjects()
+          .get(0);
+
+        jc.parse(new String[] {
+          "-C", "cb898e7a-f2a0-46d2-9a09-531f1cee1839",
+          "-S", "subscriptionA001", "subscriptionA002", "subscriptionA003",
+        });
+
+        assertThat(cmd.getSubscriptionIds(),
+          contains("subscriptionA001", "subscriptionA002", "subscriptionA003"));
+    }
+}

libraries-cli/src/test/java/com/baeldung/jcommander/usagebilling/cli/SubmitUsageCommandUnitTest.java

@@ -0,0 +1,63 @@
+package com.baeldung.jcommander.usagebilling.cli;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.Test;
+
+import com.beust.jcommander.JCommander;
+import com.beust.jcommander.ParameterException;
+
+public class SubmitUsageCommandUnitTest {
+
+    private JCommander jc = JCommander.newBuilder()
+        .addObject(new SubmitUsageCommand())
+        .build();
+
+    @Test
+    public void whenParsedCustomerParameter_thenParameterOfTypeStringIsPopulated() {
+        jc.parse(new String[] {
+            "--customer", "cb898e7a-f2a0-46d2-9a09-531f1cee1839",
+            "--subscription", "subscriptionPQRMN001",
+            "--pricing-type", "PRE_RATED",
+            "--timestamp", "2019-10-03T10:58:00",
+            "--quantity", "7",
+            "--price", "24.56"
+        });
+        
+        SubmitUsageCommand cmd = (SubmitUsageCommand) jc
+          .getObjects()
+          .get(0);
+        assertEquals("cb898e7a-f2a0-46d2-9a09-531f1cee1839", cmd.getCustomerId());
+    }
+
+    @Test
+    public void whenParsedTimestampParameter_thenParameterOfTypeInstantIsPopulated() {
+        jc.parse(new String[] {
+            "--customer", "cb898e7a-f2a0-46d2-9a09-531f1cee1839",
+            "--subscription", "subscriptionPQRMN001",
+            "--pricing-type", "PRE_RATED",
+            "--timestamp", "2019-10-03T10:58:00",
+            "--quantity", "7",
+            "--price", "24.56"
+        });
+        
+        SubmitUsageCommand cmd = (SubmitUsageCommand) jc
+          .getObjects()
+          .get(0);
+        assertEquals("2019-10-03T10:58:00Z", cmd
+          .getTimestamp()
+          .toString());
+    }
+
+    @Test(expected = ParameterException.class)
+    public void whenParsedCustomerIdNotUUID_thenParameterException() {
+        jc.parse(new String[] {
+          "--customer", "customer001",
+          "--subscription", "subscriptionPQRMN001",
+          "--pricing-type", "PRE_RATED",
+          "--timestamp", "2019-10-03T10:58:00",
+          "--quantity", "7",
+          "--price", "24.56"
+        });
+    }
+}