add UT for testing multiple files for different days

performanceDb/src/test/java/org/lucares/performance/db/TagsToFilesTest.java

@@ -48,4 +48,26 @@ public class TagsToFilesTest {
 
 		}
 	}
+
+	public void testMultipleFilesForTag() throws Exception {
+
+		try (H2DB db = new H2DB(new File(dataDirectory.toFile(), "lu.db"))) {
+			db.createField(Fields.DATE_OFFSET, FieldType.STRING);
+
+			final TagsToFile tagsToFile = new TagsToFile(dataDirectory, db);
+
+			final OffsetDateTime day1 = DateUtils.getDate(2016, 1, 1, 1, 1, 1);
+			final OffsetDateTime day2 = DateUtils.getDate(2016, 1, 2, 1, 1, 1);
+
+			final Tags tags = Tags.create("myKey", "myValue");
+
+			final PdbFile fileForDay1 = tagsToFile.getFile(day1, tags);
+			final PdbFile fileForDay2 = tagsToFile.getFile(day2, tags);
+
+			Assert.assertNotEquals(fileForDay1, fileForDay2);
+
+			final PdbFile existingFileForDay1 = tagsToFile.getFile(day1, tags);
+			Assert.assertEquals(fileForDay1, existingFileForDay1);
+		}
+	}
 }