test: add tests for empty mbtiles (#1218)

They all seem to pass, but good to ensure we test the usecase of empty
mbtiles

mbtiles/tests/copy.rs

@@ -187,6 +187,29 @@ fn databases() -> Databases {
         let mut result = Databases::default();
         for &mbt_typ in &[Flat, FlatWithHash, Normalized] {
             let typ = shorten(mbt_typ);
+
+            let (raw_empty_mbt, mut raw_empty_cn) =
+                new_file_no_hash!(databases, mbt_typ, "", "", "{typ}__empty-no-hash");
+            let dmp = dump(&mut raw_empty_cn).await.unwrap();
+            assert_snapshot!(&dmp, "{typ}__empty-no-hash");
+            result.add("empty_no_hash", mbt_typ, dmp, raw_empty_mbt, raw_empty_cn);
+
+            let (empty_mbt, mut empty_cn) = open!(databases, "{typ}__empty");
+            let raw_empty_mbt = result.mbtiles("empty_no_hash", mbt_typ);
+            let opt = MbtilesCopier {
+                src_file: path(raw_empty_mbt),
+                dst_file: path(&empty_mbt),
+                ..Default::default()
+            };
+            opt.run().await.unwrap();
+            let dmp = dump(&mut empty_cn).await.unwrap();
+            assert_snapshot!(&dmp, "{typ}__empty");
+            let hash = empty_mbt.validate(Off, Verify).await.unwrap();
+            allow_duplicates! {
+                assert_display_snapshot!(hash, @"D41D8CD98F00B204E9800998ECF8427E");
+            }
+            result.add("empty", mbt_typ, dmp, empty_mbt, empty_cn);
+
             let (raw_mbt, mut raw_cn) = new_file_no_hash!(
                 databases,
                 mbt_typ,

mbtiles/tests/snapshots/copy__databases@flat__empty-no-hash.snap

@@ -0,0 +1,32 @@
+---
+source: mbtiles/tests/copy.rs
+expression: actual_value
+---
+[[]]
+type = 'table'
+tbl_name = 'metadata'
+sql = '''
+CREATE TABLE metadata (
+             name text NOT NULL PRIMARY KEY,
+             value text)'''
+values = []
+
+[[]]
+type = 'table'
+tbl_name = 'tiles'
+sql = '''
+CREATE TABLE tiles (
+             zoom_level integer NOT NULL,
+             tile_column integer NOT NULL,
+             tile_row integer NOT NULL,
+             tile_data blob,
+             PRIMARY KEY(zoom_level, tile_column, tile_row))'''
+values = []
+
+[[]]
+type = 'index'
+tbl_name = 'metadata'
+
+[[]]
+type = 'index'
+tbl_name = 'tiles'

mbtiles/tests/snapshots/copy__databases@flat__empty.snap

@@ -0,0 +1,32 @@
+---
+source: mbtiles/tests/copy.rs
+expression: actual_value
+---
+[[]]
+type = 'table'
+tbl_name = 'metadata'
+sql = '''
+CREATE TABLE metadata (
+             name text NOT NULL PRIMARY KEY,
+             value text)'''
+values = ['(  "agg_tiles_hash", "D41D8CD98F00B204E9800998ECF8427E"  )']
+
+[[]]
+type = 'table'
+tbl_name = 'tiles'
+sql = '''
+CREATE TABLE tiles (
+             zoom_level integer NOT NULL,
+             tile_column integer NOT NULL,
+             tile_row integer NOT NULL,
+             tile_data blob,
+             PRIMARY KEY(zoom_level, tile_column, tile_row))'''
+values = []
+
+[[]]
+type = 'index'
+tbl_name = 'metadata'
+
+[[]]
+type = 'index'
+tbl_name = 'tiles'

mbtiles/tests/snapshots/copy__databases@hash__empty-no-hash.snap

@@ -0,0 +1,40 @@
+---
+source: mbtiles/tests/copy.rs
+expression: actual_value
+---
+[[]]
+type = 'table'
+tbl_name = 'metadata'
+sql = '''
+CREATE TABLE metadata (
+             name text NOT NULL PRIMARY KEY,
+             value text)'''
+values = []
+
+[[]]
+type = 'table'
+tbl_name = 'tiles_with_hash'
+sql = '''
+CREATE TABLE tiles_with_hash (
+             zoom_level integer NOT NULL,
+             tile_column integer NOT NULL,
+             tile_row integer NOT NULL,
+             tile_data blob,
+             tile_hash text,
+             PRIMARY KEY(zoom_level, tile_column, tile_row))'''
+values = []
+
+[[]]
+type = 'index'
+tbl_name = 'metadata'
+
+[[]]
+type = 'index'
+tbl_name = 'tiles_with_hash'
+
+[[]]
+type = 'view'
+tbl_name = 'tiles'
+sql = '''
+CREATE VIEW tiles AS
+             SELECT zoom_level, tile_column, tile_row, tile_data FROM tiles_with_hash'''

mbtiles/tests/snapshots/copy__databases@hash__empty.snap

@@ -0,0 +1,40 @@
+---
+source: mbtiles/tests/copy.rs
+expression: actual_value
+---
+[[]]
+type = 'table'
+tbl_name = 'metadata'
+sql = '''
+CREATE TABLE metadata (
+             name text NOT NULL PRIMARY KEY,
+             value text)'''
+values = ['(  "agg_tiles_hash", "D41D8CD98F00B204E9800998ECF8427E"  )']
+
+[[]]
+type = 'table'
+tbl_name = 'tiles_with_hash'
+sql = '''
+CREATE TABLE tiles_with_hash (
+             zoom_level integer NOT NULL,
+             tile_column integer NOT NULL,
+             tile_row integer NOT NULL,
+             tile_data blob,
+             tile_hash text,
+             PRIMARY KEY(zoom_level, tile_column, tile_row))'''
+values = []
+
+[[]]
+type = 'index'
+tbl_name = 'metadata'
+
+[[]]
+type = 'index'
+tbl_name = 'tiles_with_hash'
+
+[[]]
+type = 'view'
+tbl_name = 'tiles'
+sql = '''
+CREATE VIEW tiles AS
+             SELECT zoom_level, tile_column, tile_row, tile_data FROM tiles_with_hash'''

mbtiles/tests/snapshots/copy__databases@norm__empty-no-hash.snap

@@ -0,0 +1,71 @@
+---
+source: mbtiles/tests/copy.rs
+expression: actual_value
+---
+[[]]
+type = 'table'
+tbl_name = 'images'
+sql = '''
+CREATE TABLE images (
+             tile_id text NOT NULL PRIMARY KEY,
+             tile_data blob)'''
+values = []
+
+[[]]
+type = 'table'
+tbl_name = 'map'
+sql = '''
+CREATE TABLE map (
+             zoom_level integer NOT NULL,
+             tile_column integer NOT NULL,
+             tile_row integer NOT NULL,
+             tile_id text,
+             PRIMARY KEY(zoom_level, tile_column, tile_row))'''
+values = []
+
+[[]]
+type = 'table'
+tbl_name = 'metadata'
+sql = '''
+CREATE TABLE metadata (
+             name text NOT NULL PRIMARY KEY,
+             value text)'''
+values = []
+
+[[]]
+type = 'index'
+tbl_name = 'images'
+
+[[]]
+type = 'index'
+tbl_name = 'map'
+
+[[]]
+type = 'index'
+tbl_name = 'metadata'
+
+[[]]
+type = 'view'
+tbl_name = 'tiles'
+sql = '''
+CREATE VIEW tiles AS
+             SELECT map.zoom_level AS zoom_level,
+                    map.tile_column AS tile_column,
+                    map.tile_row AS tile_row,
+                    images.tile_data AS tile_data
+             FROM map
+             JOIN images ON images.tile_id = map.tile_id'''
+
+[[]]
+type = 'view'
+tbl_name = 'tiles_with_hash'
+sql = '''
+CREATE VIEW tiles_with_hash AS
+             SELECT
+                 map.zoom_level AS zoom_level,
+                 map.tile_column AS tile_column,
+                 map.tile_row AS tile_row,
+                 images.tile_data AS tile_data,
+                 images.tile_id AS tile_hash
+             FROM map
+             JOIN images ON images.tile_id = map.tile_id'''

mbtiles/tests/snapshots/copy__databases@norm__empty.snap

@@ -0,0 +1,71 @@
+---
+source: mbtiles/tests/copy.rs
+expression: actual_value
+---
+[[]]
+type = 'table'
+tbl_name = 'images'
+sql = '''
+CREATE TABLE images (
+             tile_id text NOT NULL PRIMARY KEY,
+             tile_data blob)'''
+values = []
+
+[[]]
+type = 'table'
+tbl_name = 'map'
+sql = '''
+CREATE TABLE map (
+             zoom_level integer NOT NULL,
+             tile_column integer NOT NULL,
+             tile_row integer NOT NULL,
+             tile_id text,
+             PRIMARY KEY(zoom_level, tile_column, tile_row))'''
+values = []
+
+[[]]
+type = 'table'
+tbl_name = 'metadata'
+sql = '''
+CREATE TABLE metadata (
+             name text NOT NULL PRIMARY KEY,
+             value text)'''
+values = ['(  "agg_tiles_hash", "D41D8CD98F00B204E9800998ECF8427E"  )']
+
+[[]]
+type = 'index'
+tbl_name = 'images'
+
+[[]]
+type = 'index'
+tbl_name = 'map'
+
+[[]]
+type = 'index'
+tbl_name = 'metadata'
+
+[[]]
+type = 'view'
+tbl_name = 'tiles'
+sql = '''
+CREATE VIEW tiles AS
+             SELECT map.zoom_level AS zoom_level,
+                    map.tile_column AS tile_column,
+                    map.tile_row AS tile_row,
+                    images.tile_data AS tile_data
+             FROM map
+             JOIN images ON images.tile_id = map.tile_id'''
+
+[[]]
+type = 'view'
+tbl_name = 'tiles_with_hash'
+sql = '''
+CREATE VIEW tiles_with_hash AS
+             SELECT
+                 map.zoom_level AS zoom_level,
+                 map.tile_column AS tile_column,
+                 map.tile_row AS tile_row,
+                 images.tile_data AS tile_data,
+                 images.tile_id AS tile_hash
+             FROM map
+             JOIN images ON images.tile_id = map.tile_id'''