Add child loggers

Child loggers mean that we can create new instances of a logger for
subsystems or specific classes, but still only have a single set of
outputs.

Signed-off-by: Thom May <thom@chef.io>

2 files changed, 61 insertions, 1 deletions

diff --git a/spec/mixlib/log/child_spec.rb b/spec/mixlib/log/child_spec.rb
new file mode 100644
index 0000000..daf3734
--- /dev/null
+++ b/spec/mixlib/log/child_spec.rb
@@ -0,0 +1,60 @@
+#
+# Copyright:: Copyright (c) 2018 Chef Software, Inc.
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+require "tempfile"
+require "stringio"
+require "spec_helper"
+
+RSpec.describe Mixlib::Log::Child do
+  before do
+    Logit.reset!
+    Logit.init(io)
+    Logit.level = :warn
+  end
+
+  let(:io) { StringIO.new }
+
+  let(:child) { Logit.with_child }
+
+  it "has a parent" do
+    expect(child.parent).to be(Logit)
+  end
+
+  it "accepts a message" do
+    Logit.with_child { |l| l.add(Logger::WARN, "a message") }
+    expect(io.string).to match(/a message$/)
+  end
+
+  context "sends a message to the parent" do
+    %i{ debug info warn error fatal }.each do |level|
+      it "at #{level}" do
+        expect(Logit).to receive(:pass).with(level, "a #{level} message", nil)
+        child.send(level, "a #{level} message")
+      end
+    end
+  end
+
+  context "can query the parent's level" do
+    %i{ debug info warn error fatal }.each do |level|
+      it "at #{level}" do
+        query = "#{level}?".to_sym
+        Logit.level = level
+        expect(child.send(query)).to be(true)
+      end
+    end
+  end
+end
diff --git a/spec/mixlib/log_spec.rb b/spec/mixlib/log_spec.rb
index 277035d..69eebd5 100644
--- a/spec/mixlib/log_spec.rb
+++ b/spec/mixlib/log_spec.rb
@@ -19,7 +19,7 @@
 
 require "tempfile"
 require "stringio"
-require File.expand_path(File.join(File.dirname(__FILE__), "..", "spec_helper"))
+require "spec_helper"
 
 class LoggerLike
   attr_accessor :level