Allow per-command environment override

While test allow declaration of custom environment variables, they must be set during the test
declaration, apply to all commands, and cannot be altered during lifecycle operations (eg: Setup).
This provides the ability to set variables for specific, individual commands.

Signed-off-by: apostasie <[email protected]>

Author: apostasie

mod/tigron/.golangci.yml

@@ -57,7 +57,7 @@ linters:
   settings:
     interfacebloat:
       # Default is 10
-      max: 13
+      max: 20
     revive:
       enable-all-rules: true
       rules:

mod/tigron/test/command.go

@@ -126,6 +126,10 @@ func (gc *GenericCommand) Feed(r io.Reader) {
 	gc.cmd.Feed(r)
 }
 
+func (gc *GenericCommand) Setenv(key, value string) {
+	gc.cmd.Env[key] = value
+}
+
 func (gc *GenericCommand) WithFeeder(fun func() io.Reader) {
 	gc.cmd.WithFeeder(fun)
 }

mod/tigron/test/interfaces.go

@@ -89,6 +89,8 @@ type TestableCommand interface {
 	WithCwd(path string)
 	// WithTimeout defines the execution timeout for a command.
 	WithTimeout(timeout time.Duration)
+	// Setenv allows to override a specific env variable directly for a specific command instead of test-wide
+	Setenv(key, value string)
 	// WithFeeder allows passing a reader to be fed to the command stdin.
 	WithFeeder(fun func() io.Reader)
 	// Feed allows passing a reader to be fed to the command stdin.