diff --git a/test_generators/operations/README.md b/test_generators/operations/README.md
new file mode 100644
index 000000000..9f1ecfddb
--- /dev/null
+++ b/test_generators/operations/README.md
@@ -0,0 +1,13 @@
+# Operations
+
+Operations (or "transactions" in previous spec iterations),
+ are atomic changes to the state, introduced by embedding in blocks.
+
+This generators provides a series of test suites, divided into handler, for each operation type.
+A operation test-runner can consume these operation test-suites,
+ and handle different kinds of operations by processing the cases using the specified test handler.
+
+Information on the format of the tests can be found in the [operations test formats documentation](../../specs/test_formats/operations/README.md).
+
+ 
+
diff --git a/test_generators/operations/deposit.py b/test_generators/operations/deposit.py
new file mode 100644
index 000000000..a72b1fbaa
--- /dev/null
+++ b/test_generators/operations/deposit.py
@@ -0,0 +1,173 @@
+from eth2spec.phase0 import spec
+from eth_utils import (
+    to_dict, to_tuple
+)
+from gen_base import gen_suite, gen_typing
+from preset_loader import loader
+from eth2spec.debug.encode import encode
+from eth2spec.utils.minimal_ssz import signing_root
+from eth2spec.utils.merkle_minimal import get_merkle_root, calc_merkle_tree_from_leaves, get_merkle_proof
+
+from typing import List, Tuple
+
+import genesis
+import keys
+from py_ecc import bls
+
+
+def build_deposit_data(state,
+                       pubkey: spec.BLSPubkey,
+                       withdrawal_cred: spec.Bytes32,
+                       privkey: int,
+                       amount: int):
+    deposit_data = spec.DepositData(
+        pubkey=pubkey,
+        withdrawal_credentials=spec.BLS_WITHDRAWAL_PREFIX_BYTE + withdrawal_cred[1:],
+        amount=amount,
+        proof_of_possession=spec.EMPTY_SIGNATURE,
+    )
+    deposit_data.proof_of_possession = bls.sign(
+        message_hash=signing_root(deposit_data),
+        privkey=privkey,
+        domain=spec.get_domain(
+            state.fork,
+            spec.get_current_epoch(state),
+            spec.DOMAIN_DEPOSIT,
+        )
+    )
+    return deposit_data
+
+
+def build_deposit(state,
+                  deposit_data_leaves: List[spec.Bytes32],
+                  pubkey: spec.BLSPubkey,
+                  withdrawal_cred: spec.Bytes32,
+                  privkey: int,
+                  amount: int) -> spec.Deposit:
+
+    deposit_data = build_deposit_data(state, pubkey, withdrawal_cred, privkey, amount)
+
+    item = spec.hash(deposit_data.serialize())
+    index = len(deposit_data_leaves)
+    deposit_data_leaves.append(item)
+    tree = calc_merkle_tree_from_leaves(tuple(deposit_data_leaves))
+    proof = list(get_merkle_proof(tree, item_index=index))
+
+    deposit = spec.Deposit(
+        proof=list(proof),
+        index=index,
+        data=deposit_data,
+    )
+
+    return deposit
+
+
+def build_deposit_for_index(initial_validator_count: int, index: int) -> Tuple[spec.Deposit, spec.BeaconState, List[spec.Bytes32]]:
+    genesis_deposits = genesis.create_deposits(
+        keys.pubkeys[:initial_validator_count],
+        keys.withdrawal_creds[:initial_validator_count]
+    )
+    state = genesis.create_genesis_state(genesis_deposits)
+
+    deposit_data_leaves = [spec.hash(dep.data.serialize()) for dep in genesis_deposits]
+
+    deposit = build_deposit(
+        state,
+        deposit_data_leaves,
+        keys.pubkeys[index],
+        keys.withdrawal_creds[index],
+        keys.privkeys[index],
+        spec.MAX_DEPOSIT_AMOUNT,
+    )
+
+    state.latest_eth1_data.deposit_root = get_merkle_root(tuple(deposit_data_leaves))
+    state.latest_eth1_data.deposit_count = len(deposit_data_leaves)
+
+    return deposit, state, deposit_data_leaves
+
+
+@to_dict
+def valid_deposit():
+    new_dep, state, leaves = build_deposit_for_index(10, 10)
+    state.latest_eth1_data.deposit_root = get_merkle_root(tuple(leaves))
+    state.latest_eth1_data.deposit_count = len(leaves)
+    yield 'case', 'valid deposit to add new validator'
+    yield 'pre', encode(state, spec.BeaconState)
+    yield 'deposit', encode(new_dep, spec.Deposit)
+    spec.process_deposit(state, new_dep)
+    yield 'post', encode(state, spec.BeaconState)
+
+
+@to_dict
+def valid_topup():
+    new_dep, state, leaves = build_deposit_for_index(10, 3)
+    state.latest_eth1_data.deposit_root = get_merkle_root(tuple(leaves))
+    state.latest_eth1_data.deposit_count = len(leaves)
+    yield 'case', 'valid deposit to top-up existing validator'
+    yield 'pre', encode(state, spec.BeaconState)
+    yield 'deposit', encode(new_dep, spec.Deposit)
+    spec.process_deposit(state, new_dep)
+    yield 'post', encode(state, spec.BeaconState)
+
+
+@to_dict
+def invalid_deposit_index():
+    new_dep, state, leaves = build_deposit_for_index(10, 10)
+    state.latest_eth1_data.deposit_root = get_merkle_root(tuple(leaves))
+    state.latest_eth1_data.deposit_count = len(leaves)
+    # Mess up deposit index, 1 too small
+    state.deposit_index = 9
+
+    yield 'case', 'invalid deposit index'
+    yield 'pre', encode(state, spec.BeaconState)
+    yield 'deposit', encode(new_dep, spec.Deposit)
+    yield 'post', None
+
+@to_dict
+def invalid_deposit_proof():
+    new_dep, state, leaves = build_deposit_for_index(10, 10)
+    state.latest_eth1_data.deposit_root = get_merkle_root(tuple(leaves))
+    state.latest_eth1_data.deposit_count = len(leaves)
+    # Make deposit proof invalid (at bottom of proof)
+    new_dep.proof[-1] = spec.ZERO_HASH
+
+    yield 'case', 'invalid deposit proof'
+    yield 'pre', encode(state, spec.BeaconState)
+    yield 'deposit', encode(new_dep, spec.Deposit)
+    yield 'post', None
+
+
+@to_tuple
+def deposit_cases():
+    yield valid_deposit()
+    yield valid_topup()
+    yield invalid_deposit_index()
+    yield invalid_deposit_proof()
+
+
+def mini_deposits_suite(configs_path: str) -> gen_typing.TestSuiteOutput:
+    presets = loader.load_presets(configs_path, 'minimal')
+    spec.apply_constants_preset(presets)
+
+    return ("deposit_minimal", "deposits", gen_suite.render_suite(
+        title="deposit operation",
+        summary="Test suite for deposit type operation processing",
+        forks_timeline="testing",
+        forks=["phase0"],
+        config="minimal",
+        handler="core",
+        test_cases=deposit_cases()))
+
+
+def full_deposits_suite(configs_path: str) -> gen_typing.TestSuiteOutput:
+    presets = loader.load_presets(configs_path, 'mainnet')
+    spec.apply_constants_preset(presets)
+
+    return ("deposit_full", "deposits", gen_suite.render_suite(
+        title="deposit operation",
+        summary="Test suite for deposit type operation processing",
+        forks_timeline="mainnet",
+        forks=["phase0"],
+        config="mainnet",
+        handler="core",
+        test_cases=deposit_cases()))
diff --git a/test_generators/operations/genesis.py b/test_generators/operations/genesis.py
new file mode 100644
index 000000000..7e0146f67
--- /dev/null
+++ b/test_generators/operations/genesis.py
@@ -0,0 +1,44 @@
+from eth2spec.phase0 import spec
+from eth2spec.utils.merkle_minimal import get_merkle_root, calc_merkle_tree_from_leaves, get_merkle_proof
+from typing import List
+
+
+def create_genesis_state(deposits: List[spec.Deposit]) -> spec.BeaconState:
+    deposit_root = get_merkle_root((tuple([spec.hash(dep.data.serialize()) for dep in deposits])))
+
+    return spec.get_genesis_beacon_state(
+        deposits,
+        genesis_time=0,
+        genesis_eth1_data=spec.Eth1Data(
+            deposit_root=deposit_root,
+            deposit_count=len(deposits),
+            block_hash=spec.ZERO_HASH,
+        ),
+    )
+
+
+def create_deposits(pubkeys: List[spec.BLSPubkey], withdrawal_cred: List[spec.Bytes32]) -> List[spec.Deposit]:
+
+    # Mock proof of possession
+    proof_of_possession = b'\x33' * 96
+
+    deposit_data = [
+        spec.DepositData(
+            pubkey=pubkeys[i],
+            withdrawal_credentials=spec.BLS_WITHDRAWAL_PREFIX_BYTE + withdrawal_cred[i][1:],
+            amount=spec.MAX_DEPOSIT_AMOUNT,
+            proof_of_possession=proof_of_possession,
+        ) for i in range(len(pubkeys))
+    ]
+
+    # Fill tree with existing deposits
+    deposit_data_leaves = [spec.hash(data.serialize()) for data in deposit_data]
+    tree = calc_merkle_tree_from_leaves(tuple(deposit_data_leaves))
+
+    return [
+        spec.Deposit(
+            proof=list(get_merkle_proof(tree, item_index=i)),
+            index=i,
+            data=deposit_data[i]
+        ) for i in range(len(deposit_data))
+    ]
diff --git a/test_generators/operations/keys.py b/test_generators/operations/keys.py
new file mode 100644
index 000000000..db4f59e0e
--- /dev/null
+++ b/test_generators/operations/keys.py
@@ -0,0 +1,7 @@
+from py_ecc import bls
+from eth2spec.phase0.spec import hash
+
+privkeys = list(range(1, 101))
+pubkeys = [bls.privtopub(k) for k in privkeys]
+# Insecure, but easier to follow
+withdrawal_creds = [hash(bls.privtopub(k)) for k in privkeys]
diff --git a/test_generators/operations/main.py b/test_generators/operations/main.py
new file mode 100644
index 000000000..dd934c758
--- /dev/null
+++ b/test_generators/operations/main.py
@@ -0,0 +1,9 @@
+from gen_base import gen_runner
+
+from deposit import mini_deposits_suite, full_deposits_suite
+
+if __name__ == "__main__":
+    gen_runner.run_generator("operations", [
+        mini_deposits_suite,
+        full_deposits_suite
+    ])
diff --git a/test_generators/operations/requirements.txt b/test_generators/operations/requirements.txt
new file mode 100644
index 000000000..dfe853536
--- /dev/null
+++ b/test_generators/operations/requirements.txt
@@ -0,0 +1,5 @@
+eth-utils==1.4.1
+../../test_libs/gen_helpers
+../../test_libs/config_helpers
+../../test_libs/pyspec
+py_ecc
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