diff --git a/cloud/shepherd/manager/provider_test.go b/cloud/shepherd/manager/provider_test.go
new file mode 100644
index 0000000..d1c6361
--- /dev/null
+++ b/cloud/shepherd/manager/provider_test.go
@@ -0,0 +1,182 @@
+package manager
+
+import (
+	"context"
+	"fmt"
+	"net/netip"
+	"time"
+
+	"github.com/google/uuid"
+	"k8s.io/klog/v2"
+
+	"source.monogon.dev/cloud/bmaas/bmdb"
+	"source.monogon.dev/cloud/bmaas/bmdb/model"
+	"source.monogon.dev/cloud/shepherd"
+)
+
+type dummyMachine struct {
+	id           shepherd.ProviderID
+	addr         netip.Addr
+	state        shepherd.State
+	agentStarted bool
+}
+
+func (dm *dummyMachine) ID() shepherd.ProviderID {
+	return dm.id
+}
+
+func (dm *dummyMachine) Addr() netip.Addr {
+	return dm.addr
+}
+
+func (dm *dummyMachine) State() shepherd.State {
+	return dm.state
+}
+
+type dummySSHClient struct {
+	SSHClient
+	dp *dummyProvider
+}
+
+type dummySSHConnection struct {
+	SSHConnection
+	m *dummyMachine
+}
+
+func (dsc *dummySSHConnection) Execute(ctx context.Context, command string, stdin []byte) ([]byte, []byte, error) {
+	stdout, stderr, err := dsc.SSHConnection.Execute(ctx, command, stdin)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	dsc.m.agentStarted = true
+	return stdout, stderr, nil
+}
+
+func (dsc *dummySSHClient) Dial(ctx context.Context, address string, timeout time.Duration) (SSHConnection, error) {
+	conn, err := dsc.SSHClient.Dial(ctx, address, timeout)
+	if err != nil {
+		return nil, err
+	}
+
+	addrPort := netip.MustParseAddrPort(address)
+	uid, err := uuid.FromBytes(addrPort.Addr().AsSlice())
+	if err != nil {
+		return nil, err
+	}
+
+	m := dsc.dp.machines[shepherd.ProviderID(uid.String())]
+	if m == nil {
+		return nil, fmt.Errorf("failed finding machine in map")
+	}
+
+	return &dummySSHConnection{conn, m}, nil
+}
+
+func (dp *dummyProvider) sshClient() SSHClient {
+	return &dummySSHClient{
+		SSHClient: &FakeSSHClient{},
+		dp:        dp,
+	}
+}
+
+func newDummyProvider(cap int) *dummyProvider {
+	return &dummyProvider{
+		capacity: cap,
+		machines: make(map[shepherd.ProviderID]*dummyMachine),
+	}
+}
+
+type dummyProvider struct {
+	capacity int
+	machines map[shepherd.ProviderID]*dummyMachine
+}
+
+func (dp *dummyProvider) createDummyMachines(ctx context.Context, session *bmdb.Session, count int) ([]shepherd.Machine, error) {
+	if len(dp.machines)+count > dp.capacity {
+		return nil, fmt.Errorf("no capacity left")
+	}
+
+	var machines []shepherd.Machine
+	for i := 0; i < count; i++ {
+		uid := uuid.Must(uuid.NewRandom())
+		m, err := dp.CreateMachine(ctx, session, shepherd.CreateMachineRequest{
+			UnusedMachine: &dummyMachine{
+				id:    shepherd.ProviderID(uid.String()),
+				state: shepherd.StateKnownUsed,
+				addr:  netip.AddrFrom16(uid),
+			},
+		})
+		if err != nil {
+			return nil, err
+		}
+		machines = append(machines, m)
+	}
+
+	return machines, nil
+}
+
+func (dp *dummyProvider) ListMachines(ctx context.Context) ([]shepherd.Machine, error) {
+	var machines []shepherd.Machine
+	for _, m := range dp.machines {
+		machines = append(machines, m)
+	}
+
+	unusedMachineCount := dp.capacity - len(machines)
+	for i := 0; i < unusedMachineCount; i++ {
+		uid := uuid.Must(uuid.NewRandom())
+		machines = append(machines, &dummyMachine{
+			id:    shepherd.ProviderID(uid.String()),
+			state: shepherd.StateKnownUnused,
+			addr:  netip.AddrFrom16(uid),
+		})
+	}
+
+	return machines, nil
+}
+
+func (dp *dummyProvider) GetMachine(ctx context.Context, id shepherd.ProviderID) (shepherd.Machine, error) {
+	for _, m := range dp.machines {
+		if m.ID() == id {
+			return m, nil
+		}
+	}
+
+	return nil, shepherd.ErrMachineNotFound
+}
+
+func (dp *dummyProvider) CreateMachine(ctx context.Context, session *bmdb.Session, request shepherd.CreateMachineRequest) (shepherd.Machine, error) {
+	dm := request.UnusedMachine.(*dummyMachine)
+
+	err := session.Transact(ctx, func(q *model.Queries) error {
+		// Create a new machine record within BMDB.
+		m, err := q.NewMachine(ctx)
+		if err != nil {
+			return fmt.Errorf("while creating a new machine record in BMDB: %w", err)
+		}
+
+		p := model.MachineAddProvidedParams{
+			MachineID:  m.MachineID,
+			ProviderID: string(dm.id),
+			Provider:   dp.Type(),
+		}
+		klog.Infof("Setting \"provided\" tag (ID: %s, PID: %s, Provider: %s).", p.MachineID, p.ProviderID, p.Provider)
+		if err := q.MachineAddProvided(ctx, p); err != nil {
+			return fmt.Errorf("while tagging machine active: %w", err)
+		}
+		return nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	dm.state = shepherd.StateKnownUsed
+	dp.machines[dm.id] = dm
+
+	return dm, nil
+}
+
+func (dp *dummyProvider) Type() model.Provider {
+	return model.ProviderNone
+}