Fix formatting when no missing lines; improve tests

1 files changed, 7 insertions, 3 deletions

diff --git a/coverage/summary.py b/coverage/summary.py
index 3588d31b..1e55a7d4 100644
--- a/coverage/summary.py
+++ b/coverage/summary.py
@@ -38,7 +38,7 @@ class SummaryReporter(Reporter):
             header += "   Missing"
             fmt_coverage += "   %s"
             if self.branches:
-                fmt_coverage += ", Branches: %s"
+                fmt_coverage += "%sBranches: %s"
         rule = "-" * len(header) + "\n"
         header += "\n"
         fmt_coverage += "\n"
@@ -61,9 +61,13 @@ class SummaryReporter(Reporter):
                     args += (nums.n_branches, nums.n_missing_branches)
                 args += (nums.pc_covered_str,)
                 if self.config.show_missing:
-                    args += (analysis.missing_formatted(),)
+                    missing_fmtd = analysis.missing_formatted()
+                    args += (missing_fmtd,)
                     if self.branches:
-                        args += (analysis.arcs_missing_formatted(),)
+                        separator = ""
+                        if missing_fmtd:
+                            separator = ", "
+                        args += (separator, analysis.arcs_missing_formatted(),)
                 outfile.write(fmt_coverage % args)
                 total += nums
             except KeyboardInterrupt:                   # pragma: not covered