1 files changed, 24 insertions, 0 deletions
diff --git a/test/chart.ts b/test/chart.ts
index bd26f3bf36..85b9d25251 100644
--- a/test/chart.ts
+++ b/test/chart.ts
@@ -106,6 +106,30 @@ describe('Chart', () => {
 		});
 	}));
 
+	
+	it('Can updates (dec)', async(async () => {
+		await testChart.decrement();
+
+		const chartHours = await testChart.getChart('hour', 3);
+		const chartDays = await testChart.getChart('day', 3);
+
+		assert.deepStrictEqual(chartHours, {
+			foo: {
+				dec: [1, 0, 0],
+				inc: [0, 0, 0],
+				total: [-1, 0, 0]
+			},
+		});
+
+		assert.deepStrictEqual(chartDays, {
+			foo: {
+				dec: [1, 0, 0],
+				inc: [0, 0, 0],
+				total: [-1, 0, 0]
+			},
+		});
+	}));
+
 	it('Empty chart', async(async () => {
 		const chartHours = await testChart.getChart('hour', 3);
 		const chartDays = await testChart.getChart('day', 3);