Merge pull request #43 from grosser/grosser/max

allow setting SINGLE_COV_MAX_OUTPUT via env

lib/single_cov.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 module SingleCov
   COVERAGES = []
-  MAX_OUTPUT = 40
+  MAX_OUTPUT = Integer(ENV["SINGLE_COV_MAX_OUTPUT"] || "40")
   RAILS_APP_FOLDERS = ["models", "serializers", "helpers", "controllers", "mailers", "views", "jobs", "channels"]
   UNCOVERED_COMMENT_MARKER = /#.*uncovered/
   PREFIXES_TO_IGNORE = [] # things to not prefix with lib/ etc
@@ -50,7 +50,9 @@ def all_covered?(result)
 
       return true if errors.empty?
 
-      errors[MAX_OUTPUT..-1] = "... coverage output truncated" if errors.size >= MAX_OUTPUT
+      if errors.size >= MAX_OUTPUT
+        errors[MAX_OUTPUT..-1] = "... coverage output truncated (use SINGLE_COV_MAX_OUTPUT=999 to expand)"
+      end
       @error_logger.puts errors
 
       errors.all? { |l| warning?(l) }

specs/single_cov_spec.rb

@@ -64,6 +64,24 @@ def add_missing_coverage(&block)
       end
     end
 
+    describe "with many uncovered" do
+      around { |test| change_file("lib/a.rb", "1", "return 1 if 1 == 1\n#{100.times.map { "puts 1" }.join("\n")}", &test) }
+
+      it "truncates when too many lines are uncovered" do
+        result = sh "ruby test/a_test.rb", fail: true
+        assert_tests_finished_normally(result)
+        expect(result).to include "1 current"
+        expect(result.count("\n")).to equal 50
+      end
+
+      it "can truncate to custom length for in-depth debugging" do
+        result = sh "SINGLE_COV_MAX_OUTPUT=60 ruby test/a_test.rb", fail: true
+        assert_tests_finished_normally(result)
+        expect(result).to include "1 current"
+        expect(result.count("\n")).to equal 70
+      end
+    end
+
     describe "running in non-root" do
       it_does_not_complain_when_everything_is_covered in_test: true
 
@@ -114,7 +132,7 @@ def add_missing_coverage(&block)
       end
     end
 
-    describe "when something is uncovered" do
+    describe "when single item is uncovered" do
       around { |block| add_missing_coverage(&block) }
 
       it "complains" do