feat: started adding test cases

Author: DaFDE31

lesson_09/types/types_app/build.gradle.kts

@@ -21,6 +21,7 @@ dependencies {
     testImplementation("org.springframework.boot:spring-boot-starter-test")
     testImplementation("org.assertj:assertj-core:3.26.3")
     testImplementation("at.favre.lib:bcrypt:0.10.2")
+    testImplementation("com.google.code.gson:gson:2.10.1")
 
     // This dependency is used by the application.
     implementation("com.codedifferently.instructional:instructional-lib")

lesson_09/types/types_app/src/main/java/com/codedifferently/lesson9/Lesson9.java

@@ -36,18 +36,16 @@ public void run(String... args) throws Exception {
     }
 
     // If the option is "--bulk", generate data files for all providers.
+    String path = getDataPath();
+    var fileGenerator = new SampleFileGenerator();
     if (option.equals("--bulk")) {
       for (DataProvider provider : providers) {
         String providerName = provider.getProviderName();
-        String path = getDataPath();
-        var fileGenerator = new SampleFileGenerator();
         fileGenerator.createProviderFile(path, providerName, provider);
       }
       return;
     }
 
-    String path = getDataPath();
-    var fileGenerator = new SampleFileGenerator();
     fileGenerator.createTestFile(path, option);
   }
 

lesson_09/types/types_app/src/main/java/com/codedifferently/lesson9/dataprovider/JohnDoeProvider.java

@@ -0,0 +1,66 @@
+package com.codedifferently.lesson9;
+
+import com.codedifferently.lesson9.dataprovider.DataProvider;
+import org.junit.jupiter.api.*;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import java.io.File;
+import java.nio.file.Files;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@SpringBootTest
+class Lesson9IntegrationTest {
+
+    @Autowired
+    private Lesson9 lesson9; // Spring injects your application
+
+    @Autowired
+    private List<DataProvider> providers;
+
+    private static final String DATA_PATH = Lesson9.getDataPath();
+
+    @BeforeEach
+    void cleanDataDir() throws Exception {
+        File dir = new File(DATA_PATH);
+        if (dir.exists()) {
+            Files.walk(dir.toPath())
+                    .map(java.nio.file.Path::toFile)
+                    .sorted((a, b) -> -a.compareTo(b)) // delete children first
+                    .forEach(File::delete);
+        }
+        dir.mkdirs();
+    }
+
+    @Test
+    void run_withSingleProvider_createsFileInCorrectPath() throws Exception {
+        // Arrange
+        String providerName = providers.get(0).getProviderName();
+        File expectedFile = new File(DATA_PATH, providerName + ".json");
+
+        // Act
+        lesson9.run(providerName);
+
+        // Assert
+        assertThat(expectedFile)
+                .exists()
+                .isFile();
+    }
+
+    @Test
+    void run_withBulkOption_createsAllProviderFiles() throws Exception {
+        // Act
+        lesson9.run("--bulk");
+
+        // Assert: every provider should have a file in the data path
+        for (DataProvider provider : providers) {
+            File file = new File(DATA_PATH, provider.getProviderName() + ".json");
+            assertThat(file)
+                    .as("File for provider " + provider.getProviderName() + " should exist")
+                    .exists()
+                    .isFile();
+        }
+    }
+}