Make sure the CLI precision is used when creating report. Fixes #674.

src/pytest_cov/engine.py

@@ -1,5 +1,6 @@
 """Coverage controllers for use by pytest-cov and nose-cov."""
 
+import argparse
 import contextlib
 import copy
 import functools
@@ -11,6 +12,7 @@
 import warnings
 from io import StringIO
 from pathlib import Path
+from typing import Union
 
 import coverage
 from coverage.data import CoverageData
@@ -67,13 +69,14 @@ def _data_suffix(name):
 class CovController:
     """Base class for different plugin implementations."""
 
-    def __init__(self, cov_source, cov_report, cov_config, cov_append, cov_branch, config=None, nodeid=None):
+    def __init__(self, options: argparse.Namespace, config: Union[None, object], nodeid: Union[None, str]):
         """Get some common config used by multiple derived classes."""
-        self.cov_source = cov_source
-        self.cov_report = cov_report
-        self.cov_config = cov_config
-        self.cov_append = cov_append
-        self.cov_branch = cov_branch
+        self.cov_source = options.cov_source
+        self.cov_report = options.cov_report
+        self.cov_config = options.cov_config
+        self.cov_append = options.cov_append
+        self.cov_branch = options.cov_branch
+        self.cov_precision = options.cov_precision
         self.config = config
         self.nodeid = nodeid
 
@@ -199,6 +202,7 @@ def summary(self, stream):
                 'show_missing': ('term-missing' in self.cov_report) or None,
                 'ignore_errors': True,
                 'file': stream,
+                'precision': self.cov_precision,
             }
             skip_covered = isinstance(self.cov_report, dict) and 'skip-covered' in self.cov_report.values()
             options.update({'skip_covered': skip_covered or None})

src/pytest_cov/plugin.py

@@ -5,6 +5,7 @@
 import warnings
 from io import StringIO
 from pathlib import Path
+from typing import TYPE_CHECKING
 
 import coverage
 import pytest
@@ -17,6 +18,9 @@
 from . import compat
 from . import embed
 
+if TYPE_CHECKING:
+    from .engine import CovController
+
 
 def validate_report(arg):
     file_choices = ['annotate', 'html', 'xml', 'json', 'lcov']
@@ -198,7 +202,7 @@ class CovPlugin:
     distributed worker.
     """
 
-    def __init__(self, options, pluginmanager, start=True, no_cov_should_warn=False):
+    def __init__(self, options: argparse.Namespace, pluginmanager, start=True, no_cov_should_warn=False):
         """Creates a coverage pytest plugin.
 
         We read the rc file that coverage uses to get the data file
@@ -240,23 +244,15 @@ def __init__(self, options, pluginmanager, start=True, no_cov_should_warn=False)
 
         # worker is started in pytest hook
 
-    def start(self, controller_cls, config=None, nodeid=None):
+    def start(self, controller_cls: type['CovController'], config=None, nodeid=None):
         if config is None:
             # fake config option for engine
             class Config:
                 option = self.options
 
             config = Config()
 
-        self.cov_controller = controller_cls(
-            self.options.cov_source,
-            self.options.cov_report,
-            self.options.cov_config,
-            self.options.cov_append,
-            self.options.cov_branch,
-            config,
-            nodeid,
-        )
+        self.cov_controller = controller_cls(self.options, config, nodeid)
         self.cov_controller.start()
         self._started = True
         self._start_path = Path.cwd()

tests/test_pytest_cov.py

@@ -476,6 +476,39 @@ def test_cov_min_float_value_not_reached_cli(testdir):
     result.stdout.fnmatch_lines(['FAIL Required test coverage of 88.89% not reached. Total coverage: 88.89%'])
 
 
+def test_cov_precision(testdir):
+    script = testdir.makepyfile(SCRIPT)
+    result = testdir.runpytest('-v', f'--cov={script.dirpath()}', '--cov-report=term-missing', '--cov-precision=6', script)
+    assert result.ret == 0
+    result.stdout.fnmatch_lines(
+        [
+            'Name                    Stmts   Miss       Cover   Missing',
+            '----------------------------------------------------------',
+            'test_cov_precision.py       9      1  88.888889%   11',
+            '----------------------------------------------------------',
+            'TOTAL                       9      1  88.888889%',
+        ]
+    )
+
+
+def test_cov_precision_from_config(testdir):
+    script = testdir.makepyfile(SCRIPT)
+    testdir.tmpdir.join('pyproject.toml').write("""
+[tool.coverage.report]
+precision = 6""")
+    result = testdir.runpytest('-v', f'--cov={script.dirpath()}', '--cov-report=term-missing', script)
+    assert result.ret == 0
+    result.stdout.fnmatch_lines(
+        [
+            'Name                                Stmts   Miss       Cover   Missing',
+            '----------------------------------------------------------------------',
+            'test_cov_precision_from_config.py       9      1  88.888889%   11',
+            '----------------------------------------------------------------------',
+            'TOTAL                                   9      1  88.888889%',
+        ]
+    )
+
+
 def test_cov_min_no_report(testdir):
     script = testdir.makepyfile(SCRIPT)