add basic test script (#5)

Author: isaacbrodsky

.github/workflows/test-linux.yml

@@ -49,3 +49,7 @@ jobs:
       - name: Build
         working-directory: build
         run: make
+
+      - name: Test SQLite3
+        working-directory: build
+        run: sqlite3 -echo -bail < "../test/test.sql"

test/test.sql

@@ -0,0 +1,7 @@
+.load ./libh3ext
+select printf('%x', latLngToCell(0,0,0));
+select printf('%f', cellToLat(latLngToCell(0,0,0)));
+select printf('%f', cellToLng(latLngToCell(0,0,0)));
+select printf('%x', cellToParent(latLngToCell(0,0,5), 4));
+select printf('%d', getResolution(latLngToCell(0,0,5)));
+