Added tests for FileFormatTest

src/test/java/scm/address/model/file/FileFormatTest.java

@@ -0,0 +1,60 @@
+package scm.address.model.file;
+
+import org.junit.jupiter.api.Test;
+import scm.address.commons.exceptions.IllegalValueException;
+
+import java.io.File;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class FileFormatTest {
+
+    private static final String VALID_FILENAME_JSON = "hello.json";
+    private static final String VALID_FILENAME_CSV = "hello.csv";
+    private static final String INVALID_FILENAME = "hello.xyz";
+
+    private static final String NO_FILE_FORMAT_FILENAME = "hello";
+
+    @Test
+    public void test_getFileFormatJson_success() throws IllegalValueException {
+        File file = new File(VALID_FILENAME_JSON);
+        assertEquals(FileFormat.JSON_FILE, FileFormat.getFileFormat(file));
+    }
+
+    @Test
+    public void test_getFileFormatCsv_success() throws IllegalValueException {
+        File file = new File(VALID_FILENAME_CSV);
+        assertEquals(FileFormat.CSV_FILE, FileFormat.getFileFormat(file));
+    }
+
+    @Test
+    public void test_getFileFormatInvalidFormat_failure() {
+        File file = new File(INVALID_FILENAME);
+        try {
+            FileFormat.getFileFormat(file);
+        } catch (IllegalValueException e) {
+            assertEquals(FileFormat.MESSAGE_UNSUPPORTED_FILE_FORMAT, e.getMessage());
+        }
+    }
+
+    @Test
+    public void test_getFileFormatNoExtension_failure() {
+        File file = new File(NO_FILE_FORMAT_FILENAME);
+        try {
+            FileFormat.getFileFormat(file);
+        } catch (IllegalValueException e) {
+            assertEquals(FileFormat.MESSAGE_INVALID_FILE_FORMAT, e.getMessage());
+        }
+    }
+
+    @Test
+    public void test_getFileFormatNullFile_failure() {
+        try {
+            FileFormat.getFileFormat(null);
+        } catch (Exception e) {
+            assertFalse(e instanceof IllegalValueException);
+            assertTrue(e instanceof NullPointerException);
+        }
+    }
+
+}