Add some tests for ad-hoc (pre-commit) Git hooks

Author: guillaume-d

spec/overcommit/hook_loader/plugin_hook_loader_spec.rb

@@ -0,0 +1,68 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'ad-hoc pre-commit hook' do
+  subject do
+    hook_loader = Overcommit::HookLoader::PluginHookLoader.new(
+      config,
+      context,
+      Overcommit::Logger.new(STDOUT)
+    )
+    hooks = hook_loader.load_hooks
+    hooks.find { |h| h.name == hook_name }
+  end
+  let(:config) do
+    config = Overcommit::Configuration.new(
+      YAML.safe_load(config_contents, [Regexp]), {
+        validate: false
+      }
+    )
+    Overcommit::ConfigurationLoader.default_configuration.merge(config)
+  end
+  let(:context) do
+    empty_stdin = File.open(File::NULL) # pre-commit hooks don't take input
+    context = Overcommit::HookContext.create('pre-commit', config, applicable_files, empty_stdin)
+    context
+  end
+
+  around do |example|
+    repo do
+      example.run
+    end
+  end
+
+  describe 'if not line-aware' do
+    let(:config_contents) do
+      <<-'YML'
+        PreCommit:
+          FooGitHook:
+            enabled: true
+            command: "foocmd"
+      YML
+    end
+    let(:hook_name) { 'FooGitHook' }
+    let(:applicable_files) { nil }
+
+    before do
+      context.stub(:execute_hook).with(%w[foocmd]).
+        and_return(result)
+    end
+
+    context 'when command succeeds' do
+      let(:result) do
+        double(success?: true, stdout: '')
+      end
+
+      it { should pass }
+    end
+
+    context 'when command fails' do
+      let(:result) do
+        double(success?: false, stdout: '', stderr: '')
+      end
+
+      it { should fail_hook }
+    end
+  end
+end