improve assertions

Author: CommanderStorm

src/feature_filter/feature_filter.test.ts

@@ -88,11 +88,11 @@ describe('filter', () => {
     test('expression, type error', () => {
         expect(() => {
             featureFilter(['==', ['number', ['get', 'x']], ['string', ['get', 'y']]]);
-        }).toThrow();
+        }).toThrow(': Cannot compare types \'number\' and \'string\'.');
 
         expect(() => {
             featureFilter(['number', ['get', 'x']]);
-        }).toThrow();
+        }).toThrow(": Expected boolean but found number instead.");
 
         expect(() => {
             featureFilter(['boolean', ['get', 'x']]);

src/migrate.test.ts

@@ -9,13 +9,13 @@ describe('migrate', () => {
     test('does not migrate from version 5', () => {
         expect(() => {
             migrate({version: 5, layers: []} as any);
-        }).toThrow(new Error('Cannot migrate from 5'));
+        }).toThrow('Cannot migrate from 5');
     });
 
     test('does not migrate from version 6', () => {
         expect(() => {
             migrate({version: 6, layers: []} as any);
-        }).toThrow(new Error('Cannot migrate from 6'));
+        }).toThrow('Cannot migrate from 6');
     });
 
     test('migrates to latest version from version 7', () => {