Update examples that start with "i" to use jest

examples/ckbtc/test/tests.ts

@@ -63,26 +63,17 @@ export function getTests(): Test {
 
             const updateBalanceResult = await config.canister.updateBalance();
 
-            if ('Err' in updateBalanceResult) {
-                throw new Error(Object.keys(updateBalanceResult.Err)[0]);
-            }
-
-            expect(true).toBe(true);
+            expect(updateBalanceResult).not.toHaveProperty('Err');
         });
 
         it('fails to update balance for second identity without new utxos', async () => {
             const config = db[1];
 
             const updateBalanceResult = await config.canister.updateBalance();
 
-            if ('Ok' in updateBalanceResult) {
-                throw new Error(
-                    `Expected principal ${config.caller} to not have new UTXOs`
-                );
-            }
-            const errorType = Object.keys(updateBalanceResult.Err)[0];
-
-            expect(errorType).toBe('NoNewUtxos');
+            expect(updateBalanceResult).toEqual(
+                expect.objectContaining({ Err: 'NoNewUtxos' })
+            );
         });
 
         it('gets balance for first identity', async () => {
@@ -96,17 +87,13 @@ export function getTests(): Test {
         it('transfers 1_000_000_000n from first canister to second canister', async () => {
             const config = db[0];
 
-            const tranferResult = await config.canister.transfer(
+            const transferResult = await config.canister.transfer(
                 db[1].caller,
                 1_000_000_000n
             );
 
-            if ('Err' in tranferResult) {
-                throw new Error(Object.keys(tranferResult.Err)[0]);
-            }
-
-            const transferIndex = tranferResult.Ok;
-            expect(transferIndex).toBe(1n);
+            expect(transferResult).not.toHaveProperty('Err');
+            expect(transferResult).toStrictEqual({ Ok: 1n });
         });
 
         it('gets balance for first identity after transfer', async () => {

examples/ethers_base/test/tests.ts

@@ -22,7 +22,7 @@ export function getTests(canisterId: string): Test {
 
             callerAddress = responseText;
 
-            expect(responseText).toMatch('0x');
+            expect(responseText).toMatch(/^0x/);
             expect(responseText).toHaveLength(42);
         });
 
@@ -34,7 +34,7 @@ export function getTests(canisterId: string): Test {
 
             canisterAddress = responseText;
 
-            expect(responseText).toMatch('0x');
+            expect(responseText).toMatch(/^0x/);
             expect(responseText).toHaveLength(42);
             expect(responseText).not.toBe(callerAddress);
         });

examples/ic_api/jest.config.js

@@ -0,0 +1,10 @@
+/** @type {import('ts-jest').JestConfigWithTsJest} */
+module.exports = {
+    preset: 'ts-jest',
+    testEnvironment: 'node',
+    transform: {
+        '^.+\\.ts$': 'ts-jest',
+        '^.+\\.js$': 'ts-jest'
+    },
+    transformIgnorePatterns: ['/node_modules/(?!(azle)/)'] // Make sure azle is transformed
+};