Add some basic gadgets to VK regression

tests/vk-regression/plain-constraint-system.ts

@@ -1,6 +1,16 @@
-import { Field, Group, Gadgets, Provable, Scalar, Hash, Bytes } from 'o1js';
+import {
+  Field,
+  Group,
+  Gadgets,
+  Provable,
+  Scalar,
+  Hash,
+  Bytes,
+  Bool,
+  UInt64,
+} from 'o1js';
 
-export { GroupCS, BitwiseCS, HashCS };
+export { GroupCS, BitwiseCS, HashCS, BasicCS };
 
 const GroupCS = constraintSystem('Group Primitive', {
   add() {
@@ -123,6 +133,46 @@ const HashCS = constraintSystem('Hashes', {
   },
 });
 
+const witness = () => Provable.witness(Field, () => Field(0));
+
+const BasicCS = constraintSystem('Basic', {
+  equals() {
+    let [x, y, z] = [witness(), witness(), witness()];
+    x.equals(y);
+    z.equals(1);
+  },
+  if() {
+    let b = Provable.witness(Bool, () => Bool(false));
+    let [x, y, z] = [witness(), witness(), witness()];
+    Provable.if(b, x, y);
+    Provable.if(b, z, Field(1));
+  },
+  toBits() {
+    let x = witness();
+    x.toBits();
+  },
+
+  // comparisons
+  assertLessThan() {
+    let [x, y] = [witness(), witness()];
+    x.assertLessThan(y);
+  },
+  lessThan() {
+    let [x, y] = [witness(), witness()];
+    x.lessThan(y);
+  },
+  assertLessThanUInt64() {
+    let x = Provable.witness(UInt64, () => new UInt64(0));
+    let y = Provable.witness(UInt64, () => new UInt64(0));
+    x.assertLessThan(y);
+  },
+  lessThanUInt64() {
+    let x = Provable.witness(UInt64, () => new UInt64(0));
+    let y = Provable.witness(UInt64, () => new UInt64(0));
+    x.lessThan(y);
+  },
+});
+
 // mock ZkProgram API for testing
 
 function constraintSystem(

tests/vk-regression/vk-regression.json

@@ -211,6 +211,43 @@
       "hash": ""
     }
   },
+  "Basic": {
+    "digest": "Basic",
+    "methods": {
+      "equals": {
+        "rows": 4,
+        "digest": "941bc7a3f1bc61dd9a031a90eda35257"
+      },
+      "if": {
+        "rows": 4,
+        "digest": "8bb444eb77c99f065f108e1dd124bdc0"
+      },
+      "toBits": {
+        "rows": 254,
+        "digest": "49e0fdd67c13bd800f641f2375301322"
+      },
+      "assertLessThan": {
+        "rows": 510,
+        "digest": "4d72e2e7b6073ac9279accec2bc3889b"
+      },
+      "lessThan": {
+        "rows": 509,
+        "digest": "163f60bf937f5a5961f08be58009d06a"
+      },
+      "assertLessThanUInt64": {
+        "rows": 27,
+        "digest": "4c2e6066727ece164bd9f1609bd564ef"
+      },
+      "lessThanUInt64": {
+        "rows": 27,
+        "digest": "6d139dfc61137449010049ee51dd1de6"
+      }
+    },
+    "verificationKey": {
+      "data": "",
+      "hash": ""
+    }
+  },
   "ecdsa-only": {
     "digest": "39205ab5c3c80677719cb409d9b798a8f07dd71fde09cef6d59719bd37ecc739",
     "methods": {

tests/vk-regression/vk-regression.ts

@@ -8,7 +8,12 @@ import {
   keccakAndEcdsa,
 } from '../../src/examples/crypto/ecdsa/ecdsa.js';
 import { SHA256Program } from '../../src/examples/crypto/sha256/sha256.js';
-import { GroupCS, BitwiseCS, HashCS } from './plain-constraint-system.js';
+import {
+  GroupCS,
+  BitwiseCS,
+  HashCS,
+  BasicCS,
+} from './plain-constraint-system.js';
 import { diverse } from './diverse-zk-program.js';
 
 // toggle this for quick iteration when debugging vk regressions
@@ -47,6 +52,7 @@ const ConstraintSystems: MinimumConstraintSystem[] = [
   GroupCS,
   BitwiseCS,
   HashCS,
+  BasicCS,
   ecdsa,
   keccakAndEcdsa,
   SHA256Program,