read user input (#11946)

* read user input * rename the unittest class
2022-03-27 18:24:31 +02:00
parent c9637e95fd
commit 3eeb5c7d2b
2 changed files with 63 additions and 0 deletions
@@ -0,0 +1,36 @@
+package com.baeldung.userinput;
+
+
+import org.junit.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class UserInputHandlerUnitTest {
+
+    @Test
+    public void givenDataInSystemIn_whenCallingReadUserInputMethod_thenHaveUserInputData() {
+        String[] inputLines = new String[]{
+            "The first line.",
+            "The second line.",
+            "The last line.",
+            "bye",
+            "anything after 'bye' will be ignored"
+        };
+        String[] expectedLines = Arrays.copyOf(inputLines, inputLines.length - 2);
+        List<String> expected = Arrays.stream(expectedLines).collect(Collectors.toList());
+        InputStream stdin = System.in;
+        try {
+            System.setIn(new ByteArrayInputStream(String.join("\n", inputLines).getBytes()));
+            List<String> actual = UserInputHandler.readUserInput();
+            assertThat(actual).isEqualTo(expected);
+        } finally {
+            System.setIn(stdin);
+        }
+    }
+}