tests: beginning of tests using Docker

pkg/pkgman/common/options.go

@@ -0,0 +1,23 @@
+package packagemanagercommon
+
+// PackageManagerOption defines a functional option for configuring a PackageManager.
+type PackageManagerOption func(interface{})
+
+// PackageParser defines an interface for parsing package version information.
+type PackageParser interface {
+	Parse(output string) (*PackageVersion, error)
+}
+
+// PackageVersion represents the installed and candidate versions of a package.
+type PackageVersion struct {
+	Installed string
+	Candidate string
+	Match     bool
+	Message   string
+}
+
+type Package struct {
+	Name         string `yaml:"name"`
+	Version      string `yaml:"version,omitempty"`
+	VersionCheck PackageVersion
+}