Add test for normalized option

test/fixtures/scale.timeseries/normalize.js

@@ -0,0 +1,39 @@
+module.exports = {
+  threshold: 0.01,
+  config: {
+    type: 'line',
+    data: {
+      datasets: [{
+        data: [
+          {x: '2017', y: null},
+          {x: '2018', y: 1},
+          {x: '2019', y: 2},
+          {x: '2020', y: 3},
+          {x: '2021', y: 4}
+        ],
+        fill: false
+      }]
+    },
+    options: {
+      normalized: true,
+      scales: {
+        x: {
+          type: 'timeseries',
+          time: {
+            parser: 'YYYY'
+          },
+          distribution: 'linear',
+          ticks: {
+            source: 'data'
+          }
+        },
+        y: {
+          display: false
+        }
+      }
+    }
+  },
+  options: {
+    spriteText: true
+  }
+};