Add namespace tests

src/test/java/com/enofex/taikai/NamespaceTest.java

@@ -0,0 +1,56 @@
+package com.enofex.taikai;
+
+import com.tngtech.archunit.core.domain.JavaClasses;
+import com.tngtech.archunit.core.importer.ClassFileImporter;
+import com.tngtech.archunit.core.importer.ImportOption;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class NamespaceTest {
+
+  private static final String VALID_NAMESPACE = "com.enofex.taikai";
+
+  @Test
+  void shouldReturnJavaClassesWithoutTests() {
+    JavaClasses result = Namespace.from(VALID_NAMESPACE, Namespace.IMPORT.WITHOUT_TESTS);
+
+    assertNotNull(result);
+    assertDoesNotThrow(() -> new ClassFileImporter()
+        .withImportOption(new ImportOption.DoNotIncludeTests())
+        .withImportOption(new ImportOption.DoNotIncludeJars())
+        .importPackages(VALID_NAMESPACE));
+  }
+
+  @Test
+  void shouldReturnJavaClassesWithTests() {
+    JavaClasses result = Namespace.from(VALID_NAMESPACE, Namespace.IMPORT.WITH_TESTS);
+
+    assertNotNull(result);
+    assertDoesNotThrow(() -> new ClassFileImporter()
+        .withImportOption(new ImportOption.DoNotIncludeJars())
+        .importPackages(VALID_NAMESPACE));
+  }
+
+  @Test
+  void shouldReturnJavaClassesOnlyTests() {
+    JavaClasses result = Namespace.from(VALID_NAMESPACE, Namespace.IMPORT.ONLY_TESTS);
+
+    assertNotNull(result);
+    assertDoesNotThrow(() -> new ClassFileImporter()
+        .withImportOption(new ImportOption.OnlyIncludeTests())
+        .withImportOption(new ImportOption.DoNotIncludeJars())
+        .importPackages(VALID_NAMESPACE));
+  }
+
+  @Test
+  void shouldThrowExceptionForNullNamespace() {
+    assertThrows(NullPointerException.class,
+        () -> Namespace.from(null, Namespace.IMPORT.WITHOUT_TESTS));
+  }
+
+  @Test
+  void shouldThrowExceptionForNullImportOption() {
+    assertThrows(NullPointerException.class, () -> Namespace.from(VALID_NAMESPACE, null));
+  }
+}