#12128 Repro: Can't change label on empty row value (#16426)

frontend/test/metabase/scenarios/visualizations/line_chart.cy.spec.js

@@ -105,6 +105,48 @@ describe("scenarios > visualizations > line chart", () => {
     });
   });
 
+  it.skip("should be possible to update/change label for an empty row value (metabase#12128)", () => {
+    visitQuestionAdhoc({
+      dataset_query: {
+        type: "native",
+        native: {
+          query:
+            "SELECT '2020-03-01'::date as date, 'cat1' as category, 23 as value\nUNION ALL\nSELECT '2020-03-01'::date, '', 44\nUNION ALL\nSELECT  '2020-03-01'::date, 'cat3', 58\n\nUNION ALL\n\nSELECT '2020-03-02'::date as date, 'cat1' as category, 20 as value\nUNION ALL\nSELECT '2020-03-02'::date, '', 50\nUNION ALL\nSELECT  '2020-03-02'::date, 'cat3', 58",
+          "template-tags": {},
+        },
+        database: 1,
+      },
+      display: "line",
+      visualization_settings: {
+        "graph.dimensions": ["DATE", "CATEGORY"],
+        "graph.metrics": ["VALUE"],
+      },
+    });
+
+    cy.findByText("Settings").click();
+
+    cy.findByTestId("sidebar-left").within(() => {
+      // Make sure we can update input with some existing value
+      cy.findByDisplayValue("cat1")
+        .type(" new")
+        .blur();
+      cy.findByDisplayValue("cat1 new");
+
+      // Now do the same for the input with no value
+      cy.findByDisplayValue("")
+        .type("cat2")
+        .blur();
+      cy.findByDisplayValue("cat2");
+
+      cy.button("Done").click();
+    });
+
+    cy.get(".LegendItem")
+      .should("contain", "cat1 new")
+      .and("contain", "cat2")
+      .and("contain", "cat3");
+  });
+
   describe.skip("tooltip of combined dashboard cards (multi-series) should show the correct column title (metabase#16249", () => {
     const RENAMED_FIRST_SERIES = "Foo";
     const RENAMED_SECOND_SERIES = "Bar";