diff --git a/pkg/beacon/state/fork_epoch_test.go b/pkg/beacon/state/fork_epoch_test.go
new file mode 100644
index 0000000..e123b2e
--- /dev/null
+++ b/pkg/beacon/state/fork_epoch_test.go
@@ -0,0 +1,371 @@
+package state_test
+
+import (
+	"testing"
+
+	"github.com/attestantio/go-eth2-client/spec"
+	"github.com/attestantio/go-eth2-client/spec/phase0"
+	"github.com/ethpandaops/beacon/pkg/beacon/state"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestForkEpochActive(t *testing.T) {
+	tests := []struct {
+		name     string
+		fork     *state.ForkEpoch
+		epoch    phase0.Epoch
+		expected bool
+	}{
+		{
+			name: "active when epoch is equal",
+			fork: &state.ForkEpoch{
+				Epoch: 100,
+			},
+			epoch:    100,
+			expected: true,
+		},
+		{
+			name: "active when epoch is greater",
+			fork: &state.ForkEpoch{
+				Epoch: 100,
+			},
+			epoch:    101,
+			expected: true,
+		},
+		{
+			name: "not active when epoch is less",
+			fork: &state.ForkEpoch{
+				Epoch: 100,
+			},
+			epoch:    99,
+			expected: false,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			assert.Equal(t, test.expected, test.fork.Active(test.epoch))
+		})
+	}
+}
+
+func TestForkEpochsActive(t *testing.T) {
+	tests := []struct {
+		name     string
+		forks    state.ForkEpochs
+		epoch    phase0.Epoch
+		expected []*state.ForkEpoch
+	}{
+		{
+			name: "returns active forks in order",
+			forks: state.ForkEpochs{
+				{
+					Epoch: 100,
+					Name:  spec.DataVersionPhase0,
+				},
+				{
+					Epoch: 200,
+					Name:  spec.DataVersionAltair,
+				},
+			},
+			epoch: 201,
+			expected: []*state.ForkEpoch{
+				{
+					Epoch: 100,
+					Name:  spec.DataVersionPhase0,
+				},
+				{
+					Epoch: 200,
+					Name:  spec.DataVersionAltair,
+				},
+			},
+		},
+		{
+			name: "returns only active forks",
+			forks: state.ForkEpochs{
+				{
+					Epoch: 100,
+					Name:  spec.DataVersionPhase0,
+				},
+				{
+					Epoch: 200,
+					Name:  spec.DataVersionAltair,
+				},
+			},
+			epoch: 150,
+			expected: []*state.ForkEpoch{
+				{
+					Epoch: 100,
+					Name:  spec.DataVersionPhase0,
+				},
+			},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			assert.Equal(t, test.expected, test.forks.Active(test.epoch))
+		})
+	}
+}
+
+func TestForkEpochsScheduled(t *testing.T) {
+	tests := []struct {
+		name     string
+		forks    state.ForkEpochs
+		epoch    phase0.Epoch
+		expected []*state.ForkEpoch
+	}{
+		{
+			name: "returns scheduled forks",
+			forks: state.ForkEpochs{
+				{
+					Epoch: 100,
+					Name:  spec.DataVersionPhase0,
+				},
+				{
+					Epoch: 200,
+					Name:  spec.DataVersionAltair,
+				},
+			},
+			epoch: 150,
+			expected: []*state.ForkEpoch{
+				{
+					Epoch: 200,
+					Name:  spec.DataVersionAltair,
+				},
+			},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			assert.Equal(t, test.expected, test.forks.Scheduled(test.epoch))
+		})
+	}
+}
+
+func TestForkEpochsCurrentFork(t *testing.T) {
+	tests := []struct {
+		name        string
+		forks       state.ForkEpochs
+		epoch       phase0.Epoch
+		expected    *state.ForkEpoch
+		expectError bool
+	}{
+		{
+			name: "returns current fork",
+			forks: state.ForkEpochs{
+				{
+					Epoch: 100,
+					Name:  spec.DataVersionPhase0,
+				},
+				{
+					Epoch: 200,
+					Name:  spec.DataVersionAltair,
+				},
+			},
+			epoch: 201,
+			expected: &state.ForkEpoch{
+				Epoch: 200,
+				Name:  spec.DataVersionAltair,
+			},
+		},
+		{
+			name:        "errors with no forks",
+			forks:       state.ForkEpochs{},
+			epoch:       100,
+			expectError: true,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			result, err := test.forks.CurrentFork(test.epoch)
+			if test.expectError {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+				assert.Equal(t, test.expected, result)
+			}
+		})
+	}
+}
+
+func TestForkEpochsPreviousFork(t *testing.T) {
+	tests := []struct {
+		name        string
+		forks       state.ForkEpochs
+		epoch       phase0.Epoch
+		expected    *state.ForkEpoch
+		expectError bool
+	}{
+		{
+			name: "returns previous fork",
+			forks: state.ForkEpochs{
+				{
+					Epoch: 100,
+					Name:  spec.DataVersionPhase0,
+				},
+				{
+					Epoch: 200,
+					Name:  spec.DataVersionAltair,
+				},
+			},
+			epoch: 201,
+			expected: &state.ForkEpoch{
+				Epoch: 100,
+				Name:  spec.DataVersionPhase0,
+			},
+		},
+		{
+			name: "returns current fork with single fork",
+			forks: state.ForkEpochs{
+				{
+					Epoch: 100,
+					Name:  spec.DataVersionPhase0,
+				},
+			},
+			epoch: 101,
+			expected: &state.ForkEpoch{
+				Epoch: 100,
+				Name:  spec.DataVersionPhase0,
+			},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			result, err := test.forks.PreviousFork(test.epoch)
+			if test.expectError {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+				assert.Equal(t, test.expected, result)
+			}
+		})
+	}
+}
+
+func TestForkEpochsGetByName(t *testing.T) {
+	tests := []struct {
+		name        string
+		forks       state.ForkEpochs
+		forkName    string
+		expected    *state.ForkEpoch
+		expectError bool
+	}{
+		{
+			name: "returns fork by name",
+			forks: state.ForkEpochs{
+				{
+					Epoch: 100,
+					Name:  spec.DataVersionPhase0,
+				},
+			},
+			forkName: "phase0",
+			expected: &state.ForkEpoch{
+				Epoch: 100,
+				Name:  spec.DataVersionPhase0,
+			},
+		},
+		{
+			name: "errors with non-existent fork",
+			forks: state.ForkEpochs{
+				{
+					Epoch: 100,
+					Name:  spec.DataVersionPhase0,
+				},
+			},
+			forkName:    "invalid",
+			expectError: true,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			result, err := test.forks.GetByName(test.forkName)
+			if test.expectError {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+				assert.Equal(t, test.expected, result)
+			}
+		})
+	}
+}
+
+func TestForkEpochsLatestActiveFork(t *testing.T) {
+	tests := []struct {
+		name        string
+		forks       state.ForkEpochs
+		epoch       phase0.Epoch
+		expected    *state.ForkEpoch
+		expectError bool
+	}{
+		{
+			name: "returns latest fork when multiple are active",
+			forks: state.ForkEpochs{
+				{
+					Epoch: 100,
+					Name:  spec.DataVersionPhase0,
+				},
+				{
+					Epoch: 100,
+					Name:  spec.DataVersionAltair,
+				},
+				{
+					Epoch: 100,
+					Name:  spec.DataVersionBellatrix,
+				},
+			},
+			epoch: 100,
+			expected: &state.ForkEpoch{
+				Epoch: 100,
+				Name:  spec.DataVersionBellatrix,
+			},
+		},
+		{
+			name: "non phase0 genesis",
+			forks: state.ForkEpochs{
+				{
+					Epoch: 0,
+					Name:  spec.DataVersionPhase0,
+				},
+				{
+					Epoch: 0,
+					Name:  spec.DataVersionAltair,
+				},
+				{
+					Epoch: 0,
+					Name:  spec.DataVersionBellatrix,
+				},
+				{
+					Epoch: 0,
+					Name:  spec.DataVersionCapella,
+				},
+				{
+					Epoch: 1000,
+					Name:  spec.DataVersionDeneb,
+				},
+			},
+			epoch: 100,
+			expected: &state.ForkEpoch{
+				Epoch: 0,
+				Name:  spec.DataVersionCapella,
+			},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			result, err := test.forks.CurrentFork(test.epoch)
+			if test.expectError {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+				assert.Equal(t, test.expected, result)
+			}
+		})
+	}
+}