Integration test for PhoneBillDAO

projects-parent/originals-parent/phonebill/src/it/java/edu/pdx/cs/joy/phonebill/PhoneBillDAOIT.java

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+package edu.pdx.cs.joy.phonebill;
+
+import edu.pdx.cs.joy.InvokeMainTestCase;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.nio.file.Path;
+
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+/**
+ * Integration tests for {@link PhoneBillDAO#main(String[])}.
+ */
+class PhoneBillDAOIT extends InvokeMainTestCase {
+
+  private MainMethodResult invokeMain(String... args) {
+    return invokeMain(PhoneBillDAO.class, args);
+  }
+
+  @Test
+  void testNoCommandLineArguments() {
+    MainMethodResult result = invokeMain();
+
+    assertThat(result.getTextWrittenToStandardError(),
+      containsString("Usage: java PhoneBillDAO <db-file> <customer-name>"));
+  }
+
+  @Test
+  void testCreatesAndRetrievesPhoneBill(@TempDir Path tempDirectory) {
+    String databaseFile = tempDirectory.resolve("phonebill").toString();
+    String customerName = "Test Customer";
+
+    MainMethodResult result = invokeMain(databaseFile, customerName);
+
+    assertThat(result.getTextWrittenToStandardOut(),
+      containsString("Retrieved PhoneBill for customer: " + customerName));
+  }
+}