Update copyright notices' years

I used the Git history for years after 2019, and only included 2019 or
2018 if they were already there.  I also added copyright notices to all
code files that don't already have them.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/test/java/sevenUnits/unit/UnitValueTest.java b/src/test/java/sevenUnits/unit/UnitValueTest.java
index 69569ae..6b80986 100644
--- a/src/test/java/sevenUnits/unit/UnitValueTest.java
+++ b/src/test/java/sevenUnits/unit/UnitValueTest.java
@@ -1,3 +1,19 @@
+/**
+ * Copyright (C) 2021, 2025 Adrien Hopkins
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 package sevenUnits.unit;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;