feat(oonirun): improve tests (#915)

See https://github.com/ooni/probe/issues/2184

While there, rename `runtimex.PanicIfFalse` to `runtimex.Assert` (it was about time...)

internal/model/mocks/experimentbuilder.go

@@ -0,0 +1,48 @@
+package mocks
+
+import "github.com/ooni/probe-cli/v3/internal/model"
+
+// ExperimentBuilder mocks model.ExperimentBuilder.
+type ExperimentBuilder struct {
+	MockInterruptible func() bool
+
+	MockInputPolicy func() model.InputPolicy
+
+	MockOptions func() (map[string]model.ExperimentOptionInfo, error)
+
+	MockSetOptionAny func(key string, value any) error
+
+	MockSetOptionsAny func(options map[string]any) error
+
+	MockSetCallbacks func(callbacks model.ExperimentCallbacks)
+
+	MockNewExperiment func() model.Experiment
+}
+
+func (eb *ExperimentBuilder) Interruptible() bool {
+	return eb.MockInterruptible()
+}
+
+func (eb *ExperimentBuilder) InputPolicy() model.InputPolicy {
+	return eb.MockInputPolicy()
+}
+
+func (eb *ExperimentBuilder) Options() (map[string]model.ExperimentOptionInfo, error) {
+	return eb.MockOptions()
+}
+
+func (eb *ExperimentBuilder) SetOptionAny(key string, value any) error {
+	return eb.MockSetOptionAny(key, value)
+}
+
+func (eb *ExperimentBuilder) SetOptionsAny(options map[string]any) error {
+	return eb.MockSetOptionsAny(options)
+}
+
+func (eb *ExperimentBuilder) SetCallbacks(callbacks model.ExperimentCallbacks) {
+	eb.MockSetCallbacks(callbacks)
+}
+
+func (eb *ExperimentBuilder) NewExperiment() model.Experiment {
+	return eb.MockNewExperiment()
+}