add integration test for dvclive 2.x->3.x plots

tests/integration/plots/conftest.py

@@ -191,3 +191,58 @@ def repo_with_config_plots(tmp_dir, scm, dvc, run_copy_metrics):
         }
 
     return make
+
+
+@pytest.fixture
+def repo_with_dvclive_plots(tmp_dir, scm, dvc, run_copy_metrics):
+    def make():
+        metrics = [
+            {"step": 1, "metric": 0.1},
+            {"step": 2, "metric": 0.2},
+            {"step": 3, "metric": 0.3},
+        ]
+
+        metrics_path = tmp_dir / "dvclive" / "plots" / "metrics" / "metric.tsv"
+        metrics_path.parent.mkdir(parents=True)
+        metrics_path.dump_json(metrics)
+
+        plots_config_v1 = [
+            {
+                "plots/metrics": {
+                    "x": "step",
+                }
+            }
+        ]
+
+        from dvc.utils.serialize import modify_yaml
+
+        dvcyaml_path_v1 = tmp_dir / "dvclive" / "dvc.yaml"
+        with modify_yaml(dvcyaml_path_v1) as dvcfile_content:
+            dvcfile_content["plots"] = plots_config_v1
+        scm.add([metrics_path, dvcyaml_path_v1])
+        scm.commit("add dvclive 2.x plots")
+
+        yield {
+            "data": {metrics_path: metrics},
+            "configs": {dvcyaml_path_v1: plots_config_v1},
+        }
+
+        plots_config_v2 = [
+            {
+                "dvclive/plots/metrics": {
+                    "x": "step",
+                }
+            }
+        ]
+
+        dvcyaml_path_v1.unlink()
+        dvcyaml_path_v2 = tmp_dir / "dvc.yaml"
+        with modify_yaml(dvcyaml_path_v2) as dvcfile_content:
+            dvcfile_content["plots"] = plots_config_v2
+
+        yield {
+            "data": {metrics_path: metrics},
+            "configs": {dvcyaml_path_v2: plots_config_v2},
+        }
+
+    return make

tests/integration/plots/test_plots.py

@@ -458,3 +458,18 @@ def test_repo_with_config_plots(tmp_dir, capsys, repo_with_config_plots):
 
     assert html_result["linear_train_vs_test"]["data"]["values"] == ble
     # TODO check json results once vscode is able to handle flexible plots
+
+
+@pytest.mark.vscode
+def test_repo_with_dvclive_plots(tmp_dir, capsys, repo_with_dvclive_plots):
+    next(repo_with_dvclive_plots())
+
+    for s in ("show", "diff"):
+        _, json_result, split_json_result = call(capsys, subcommand=s)
+        expected_result = {
+            "data": {
+                "dvclive/plots/metrics/metric.tsv": [],
+            },
+        }
+        assert json_result == expected_result
+        assert split_json_result == expected_result