diff --git a/src/__tests__/validation.test.ts b/src/__tests__/validation.test.ts
new file mode 100644
index 0000000..0f785fc
--- /dev/null
+++ b/src/__tests__/validation.test.ts
@@ -0,0 +1,123 @@
+import { BigNumber } from "bignumber.js";
+
+import { fetchTokenList, MinimalTokenInfo } from "../hooks/token";
+import { UnknownTransfer, AssetTransfer, CollectibleTransfer } from "../hooks/useCsvParser";
+import { validateRow, validateAssetRow, validateCollectibleRow } from "../parser/validation";
+import { testData } from "../test/util";
+
+const dummySafeInfo = testData.dummySafeInfo;
+let listedToken: MinimalTokenInfo;
+
+describe("validateRow", () => {
+  it("should return warnings for unknown token_type", () => {
+    const unknownTransfer: UnknownTransfer = { token_type: "unknown" };
+    const result = validateRow(unknownTransfer);
+    expect(result).toEqual(["Unknown token_type: Must be one of erc20, native or nft"]);
+  });
+
+  it("should call validateAssetRow for erc20", () => {
+    const assetTransfer: AssetTransfer = {
+      token_type: "erc20",
+      tokenAddress: null,
+      receiver: testData.addresses.receiver1,
+      amount: "1",
+      decimals: 18,
+      receiverEnsName: null,
+    };
+    const result = validateRow(assetTransfer);
+    expect(result).toEqual([]);
+  });
+
+  it("should call validateCollectibleRow for erc721", () => {
+    const collectibleTransfer: CollectibleTransfer = {
+      token_type: "erc721",
+      tokenAddress: testData.addresses.dummyErc721Address,
+      receiver: testData.addresses.receiver1,
+      tokenId: new BigNumber("69").toFixed(),
+      from: testData.dummySafeInfo.safeAddress,
+      receiverEnsName: null,
+    };
+    const result = validateRow(collectibleTransfer);
+    expect(result).toEqual([]);
+  });
+});
+
+describe("validateAssetRow", () => {
+  beforeAll(async () => {
+    const tokenList = await fetchTokenList(dummySafeInfo.chainId);
+    let listedTokens = Array.from(tokenList.keys());
+    const tokenInfo = tokenList.get(listedTokens[0]);
+    if (typeof tokenInfo !== "undefined") {
+      listedToken = tokenInfo;
+    }
+  });
+
+  it("should validate positive amount", () => {
+    const assetTransfer: AssetTransfer = {
+      token_type: "erc20",
+      tokenAddress: listedToken.address,
+      receiver: testData.addresses.receiver1,
+      amount: "-1",
+      decimals: listedToken.decimals,
+      receiverEnsName: null,
+    };
+    const result = validateAssetRow(assetTransfer);
+    expect(result).toContain("Only positive amounts/values possible: -1");
+  });
+
+  it("should validate if token is found", () => {
+    const assetTransfer: AssetTransfer = {
+      token_type: "erc20",
+      tokenAddress: listedToken.address,
+      receiver: testData.addresses.receiver1,
+      amount: "10",
+      decimals: -1,
+      symbol: "TOKEN_NOT_FOUND",
+      receiverEnsName: null,
+    };
+    const result = validateAssetRow(assetTransfer);
+    expect(result).toContain("No token contract was found at " + listedToken.address);
+  });
+});
+
+describe("validateCollectibleRow", () => {
+  it("should validate positive token ID", () => {
+    const collectibleTransfer: CollectibleTransfer = {
+      token_type: "erc721",
+      tokenAddress: testData.addresses.dummyErc721Address,
+      receiver: testData.addresses.receiver1,
+      tokenId: "-1",
+      from: testData.dummySafeInfo.safeAddress,
+      receiverEnsName: null,
+    };
+    const result = validateCollectibleRow(collectibleTransfer);
+    expect(result).toContain("Only positive Token IDs possible: -1");
+  });
+
+  it("should validate integer token ID", () => {
+    const collectibleTransfer: CollectibleTransfer = {
+      token_type: "erc721",
+      tokenAddress: testData.addresses.dummyErc721Address,
+      receiver: testData.addresses.receiver1,
+      tokenId: "1.5",
+      from: testData.dummySafeInfo.safeAddress,
+      receiverEnsName: null,
+    };
+    const result = validateCollectibleRow(collectibleTransfer);
+    expect(result).toContain("Token IDs must be integer numbers: 1.5");
+  });
+
+  it("should validate value for ERC1155 tokens", () => {
+    const erc1155Transfer: CollectibleTransfer = {
+      token_type: "erc1155",
+      tokenAddress: testData.addresses.dummyErc721Address,
+      receiver: testData.addresses.receiver1,
+      tokenId: "1",
+      amount: "0",
+      from: testData.dummySafeInfo.safeAddress,
+      receiverEnsName: null,
+    };
+    const result = validateCollectibleRow(erc1155Transfer);
+    expect(result).toContain("ERC1155 Tokens need a defined value > 0: 0");
+  });
+});