metrics: pass --precision to _show_metrics (#5839)

* metrics: pass --precision to _show_metrics

* tests: return empty string

dvc/command/metrics.py

@@ -95,6 +95,7 @@ class CmdMetricsShow(CmdMetricsBase):
                     self.args.all_branches,
                     self.args.all_tags,
                     self.args.all_commits,
+                    self.args.precision,
                 )
                 if table:
                     logger.info(table)

tests/unit/command/test_metrics.py

@@ -111,16 +111,23 @@ def test_metrics_show(dvc, mocker):
             "--all-commits",
             "target1",
             "target2",
+            "--precision",
+            "8",
         ]
     )
     assert cli_args.func == CmdMetricsShow
 
     cmd = cli_args.func(cli_args)
-    m = mocker.patch("dvc.repo.metrics.show.show", return_value={})
+    m1 = mocker.patch("dvc.repo.metrics.show.show", return_value={})
+    m2 = mocker.patch(
+        "dvc.command.metrics._show_metrics",
+        spec=_show_metrics,
+        return_value="",
+    )
 
     assert cmd.run() == 0
 
-    m.assert_called_once_with(
+    m1.assert_called_once_with(
         cmd.repo,
         ["target1", "target2"],
         recursive=True,
@@ -128,6 +135,14 @@ def test_metrics_show(dvc, mocker):
         all_branches=True,
         all_commits=True,
     )
+    m2.assert_called_once_with(
+        {},
+        markdown=False,
+        all_tags=True,
+        all_branches=True,
+        all_commits=True,
+        precision=8,
+    )
 
 
 def test_metrics_diff_precision():