Add example i/o test

10_Blackjack/java/test/GameTest.java

@@ -0,0 +1,40 @@
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.EOFException;
+import java.io.Reader;
+import java.io.StringReader;
+import java.io.StringWriter;
+import java.io.UncheckedIOException;
+
+public class GameTest {
+
+    private StringReader in;
+    private StringWriter out;
+    private Game game;
+
+    private void givenInput(String input) {
+        Reader in = new StringReader("\u2404"); // U+2404 is "End of Transmission" sent by CTRL+D (or CTRL+Z on Windows)
+        StringWriter out = new StringWriter();
+        UserIo userIo = new UserIo(in, out);
+        Deck deck = new Deck((cards) -> cards);
+        game = new Game(deck, userIo);
+    }
+
+    @Test
+    public void shouldQuitOnCtrlD() {
+        // Given
+        givenInput("\u2404"); // U+2404 is "End of Transmission" sent by CTRL+D (or CTRL+Z on Windows)
+
+        // When
+        Exception e = assertThrows(UncheckedIOException.class, game::run);
+
+        // Then
+        assertTrue(e.getCause() instanceof EOFException);
+        assertEquals("!END OF INPUT", e.getMessage());
+    }
+}

10_Blackjack/java/test/UserIoTest.java

@@ -0,0 +1,84 @@
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.Reader;
+import java.io.StringReader;
+import java.io.StringWriter;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+import org.junit.jupiter.params.provider.ValueSource;
+
+public class UserIoTest {
+
+    @ParameterizedTest(name = "''{0}'' is accepted as ''no''")
+    @ValueSource(strings = {"N", "n", "No", "NO", "no"})
+    public void testPromptBooleanAcceptsNo(String response) {
+        // Given
+        Reader in = new StringReader(response + "\n");
+        StringWriter out = new StringWriter();
+        UserIo userIo = new UserIo(in, out);
+
+        // When
+        boolean result = userIo.promptBoolean("TEST");
+
+        // Then
+        assertEquals("TEST? ", out.toString());
+        assertFalse(result);
+    }
+
+    @ParameterizedTest(name = "''{0}'' is accepted as ''yes''")
+    @ValueSource(strings = {"Y", "y", "Yes", "YES", "yes", "", "foobar"})
+    public void testPromptBooleanAcceptsYes(String response) {
+        // Given
+        Reader in = new StringReader(response + "\n");
+        StringWriter out = new StringWriter();
+        UserIo userIo = new UserIo(in, out);
+
+        // When
+        boolean result = userIo.promptBoolean("TEST");
+
+        // Then
+        assertEquals("TEST? ", out.toString());
+        assertTrue(result);
+    }
+
+    @ParameterizedTest(name = "''{0}'' is accepted as number")
+    @CsvSource({
+        "1,1",
+        "0,0",
+        "-1,-1",
+    })
+    public void testPromptIntAcceptsNumbers(String response, int expected) {
+        // Given
+        Reader in = new StringReader(response + "\n");
+        StringWriter out = new StringWriter();
+        UserIo userIo = new UserIo(in, out);
+
+        // When
+        int result = userIo.promptInt("TEST");
+
+        // Then
+        assertEquals("TEST? ", out.toString());
+        assertEquals(expected, result);
+    }
+
+    @Test
+    @DisplayName("promptInt should print an error and reprompt if given a non-numeric response")
+    public void testPromptIntRepromptsOnNonNumeric() {
+        // Given
+        Reader in = new StringReader("foo\n1"); // word, then number
+        StringWriter out = new StringWriter();
+        UserIo userIo = new UserIo(in, out);
+
+        // When
+        int result = userIo.promptInt("TEST");
+
+        // Then
+        assertEquals("TEST? !NUMBER EXPECTED - RETRY INPUT LINE\n? ", out.toString());
+        assertEquals(1, result);
+    }
+}