fix cli preserve param default and spec tests

27086b7 originally changed the preserve default to :on-failure,
but 2e3ba3b erroneously changed it from on-failure to always,
and the spec tests added in 94b87cc never caught the discrepancy
because the class abruptly exits due to invalid parameters in the tests

CHANGELOG.md

@@ -6,6 +6,7 @@ This changelog adheres to [Keep a CHANGELOG](https://keepachangelog.com).
 
 ## [Unreleased]
 - Bump minimum ruby requirement to 2.7
+- Fix preserve param default behaving like `always` but should be `on-failure`
 
 ## [0.52.0] - 2024-06-03
 ### Added

lib/vanagon/cli/build.rb

@@ -15,7 +15,7 @@ class Build < Vanagon::CLI
           -o, --only-build COMPONENT,COMPONENT,...
                                            Only build listed COMPONENTs
           -p, --preserve [RULE]            Rule for VM preservation: never, on-failure, always
-                                             [Default: always]
+                                             [Default: on-failure]
           -r, --remote-workdir DIRECTORY   Working directory on the remote host
           -s, --skipcheck                  Skip the "check" stage when building components
           -w, --workdir DIRECTORY          Working directory on the local host

lib/vanagon/driver.rb

@@ -24,7 +24,7 @@ def retry_count
     def initialize(platform, project, options = {}) # rubocop:disable Metrics/AbcSize, Metrics/PerceivedComplexity
       @options = options
       @verbose = options[:verbose] || false
-      @preserve = options[:preserve] || false
+      @preserve = options[:preserve] || :'on-failure'
       @workdir = options[:workdir] || Dir.mktmpdir
 
       @@configdir = options[:configdir] || File.join(Dir.pwd, "configs")

spec/lib/vanagon/cli_spec.rb

@@ -53,7 +53,7 @@
     end
     it "preserve defaults to :on-failure" do
       subject = described_class.new
-      expect(subject.parse([])).to include(:preserve => :'on-failure')
+      expect(subject.parse(%W[build hello project platform])).to include(:preserve => :'on-failure')
     end
   end