feat: include branches taken and missed in JSON report. #1425

Added more branches to the code whose coverage is checked.

Add branch details to json report

The json report now includes for each branch which branches have been
executed, missed and what the percentage of covered branches was.

Add exiting branch arc to json report test

Update branch details format

Executed and missing branch arcs are stored in the fields named
'executed_branches' and 'missing_branches' respectively. Both fields
contain a list of two element lists. The first element represents the
source line number and the second one the target line number. Exit
branches have their target line number set to 0.

Fix linting errors

1 files changed, 13 insertions, 0 deletions

diff --git a/coverage/jsonreport.py b/coverage/jsonreport.py
index 43edc452..7ca468e3 100644
--- a/coverage/jsonreport.py
+++ b/coverage/jsonreport.py
@@ -102,4 +102,17 @@ class JsonReporter:
                 'covered_branches': nums.n_executed_branches,
                 'missing_branches': nums.n_missing_branches,
             })
+            reported_file['executed_branches'] = list(
+                _convert_branch_arcs(analysis.executed_branch_arcs())
+            )
+            reported_file['missing_branches'] = list(
+                _convert_branch_arcs(analysis.missing_branch_arcs())
+            )
         return reported_file
+
+
+def _convert_branch_arcs(branch_arcs):
+    """Convert branch arcs to a list of two-element tuples."""
+    for source, targets in branch_arcs.items():
+        for target in targets:
+            yield source, target if target != -1 else 0