diff --git a/lamassu-next/packages/cashu/src/__tests__/index.test.ts b/lamassu-next/packages/cashu/src/__tests__/index.test.ts
new file mode 100644
index 0000000..6b40426
--- /dev/null
+++ b/lamassu-next/packages/cashu/src/__tests__/index.test.ts
@@ -0,0 +1,17 @@
+import { describe, it, expect } from 'vitest'
+import { version } from '../index.js'
+
+describe('@lamassu/cashu', () => {
+  describe('exports', () => {
+    it('should export version', () => {
+      expect(version).toBe('0.1.0')
+    })
+  })
+
+  // TODO: Add tests when cashu functionality is implemented
+  describe('placeholder', () => {
+    it('should pass placeholder test', () => {
+      expect(true).toBe(true)
+    })
+  })
+})
diff --git a/lamassu-next/packages/clink/src/__tests__/noffer.test.ts b/lamassu-next/packages/clink/src/__tests__/noffer.test.ts
index 996320e..a755e9d 100644
--- a/lamassu-next/packages/clink/src/__tests__/noffer.test.ts
+++ b/lamassu-next/packages/clink/src/__tests__/noffer.test.ts
@@ -22,7 +22,7 @@ describe('noffer encoding/decoding', () => {
       const offer: CLINKOffer = {
         ...sampleOffer,
         priceType: 'fixed',
-        amountMsat: 1000000,
+        amountSats: 1000,
       }
 
       const noffer = encodeNoffer(offer)
@@ -45,14 +45,14 @@ describe('noffer encoding/decoding', () => {
       const offer: CLINKOffer = {
         ...sampleOffer,
         priceType: 'fixed',
-        amountMsat: 50000,
+        amountSats: 50000,
       }
 
       const noffer = encodeNoffer(offer)
       const decoded = decodeNoffer(noffer)
 
       expect(decoded.priceType).toBe('fixed')
-      expect(decoded.amountMsat).toBe(50000)
+      expect(decoded.amountSats).toBe(50000)
     })
 
     it('should throw on invalid prefix', () => {
diff --git a/lamassu-next/packages/clink/src/noffer.ts b/lamassu-next/packages/clink/src/noffer.ts
index 7ce42e1..886b2fc 100644
--- a/lamassu-next/packages/clink/src/noffer.ts
+++ b/lamassu-next/packages/clink/src/noffer.ts
@@ -177,9 +177,12 @@ function decodePriceType(byte: number): PriceType {
 }
 
 function encodeUint64BE(value: number): number[] {
-  const bytes: number[] = []
-  for (let i = 7; i >= 0; i--) {
-    bytes.push((value >> (i * 8)) & 0xff)
+  // Use division instead of bit shifts because JS bitwise ops only work on 32-bit ints
+  const bytes: number[] = new Array(8).fill(0)
+  let remaining = value
+  for (let i = 7; i >= 0 && remaining > 0; i--) {
+    bytes[i] = remaining % 256
+    remaining = Math.floor(remaining / 256)
   }
   return bytes
 }
diff --git a/lamassu-next/packages/lightning/src/__tests__/client.test.ts b/lamassu-next/packages/lightning/src/__tests__/client.test.ts
index 764c79b..15c51af 100644
--- a/lamassu-next/packages/lightning/src/__tests__/client.test.ts
+++ b/lamassu-next/packages/lightning/src/__tests__/client.test.ts
@@ -1,9 +1,8 @@
-import { describe, it, expect, vi } from 'vitest'
+import { describe, it, expect } from 'vitest'
 import { LightningPubClient } from '../client.js'
 
 describe('LightningPubClient', () => {
   const config = {
-    serviceUrl: 'https://lightning.pub',
     accountPubkey: 'a'.repeat(64),
     relays: ['wss://relay.example.com'],
   }
@@ -13,6 +12,15 @@ describe('LightningPubClient', () => {
       const client = new LightningPubClient(config)
       expect(client).toBeDefined()
     })
+
+    it('should accept optional timeout and appId', () => {
+      const client = new LightningPubClient({
+        ...config,
+        timeout: 60000,
+        appId: 'test-app',
+      })
+      expect(client).toBeDefined()
+    })
   })
 
   describe('getExchangeRate', () => {
@@ -33,26 +41,47 @@ describe('LightningPubClient', () => {
 
       expect(usdRate.satsPerUnit).not.toBe(eurRate.satsPerUnit)
     })
+
+    it('should return default rate for unknown currency', async () => {
+      const client = new LightningPubClient(config)
+      const rate = await client.getExchangeRate('XYZ')
+
+      expect(rate.currency).toBe('XYZ')
+      expect(rate.satsPerUnit).toBe(2500) // default rate
+    })
   })
 
   describe('decodeInvoice', () => {
-    it('should decode a basic invoice', () => {
+    it('should decode invoice with micro-BTC amount', () => {
       const client = new LightningPubClient(config)
-
-      // This is a simplified test since we have basic parsing
       const result = client.decodeInvoice('lnbc100u1...')
 
       expect(result).toBeDefined()
+      expect(result.amountSats).toBe(10000) // 100 micro-BTC = 10000 sats
       expect(result.expiresAt).toBeGreaterThan(Date.now() / 1000)
     })
+
+    it('should decode invoice with milli-BTC amount', () => {
+      const client = new LightningPubClient(config)
+      const result = client.decodeInvoice('lnbc1m1...')
+
+      expect(result.amountSats).toBe(100000) // 1 milli-BTC = 100000 sats
+    })
+
+    it('should return null amount for invoice without amount', () => {
+      const client = new LightningPubClient(config)
+      const result = client.decodeInvoice('lnbcrt1...')
+
+      expect(result.amountSats).toBeNull()
+    })
   })
 
   describe('initialize', () => {
-    it('should require nostrClient and identity', () => {
+    it('should require nostrClient and identity', async () => {
       const client = new LightningPubClient(config)
 
       // Without initialization, operations should fail
-      expect(client.getBalance()).rejects.toThrow('Client not initialized')
+      await expect(client.getBalance()).rejects.toThrow('Client not initialized')
     })
   })
 
diff --git a/lamassu-next/packages/ui-shared/src/__tests__/index.test.ts b/lamassu-next/packages/ui-shared/src/__tests__/index.test.ts
new file mode 100644
index 0000000..68abb49
--- /dev/null
+++ b/lamassu-next/packages/ui-shared/src/__tests__/index.test.ts
@@ -0,0 +1,17 @@
+import { describe, it, expect } from 'vitest'
+import { version } from '../index.js'
+
+describe('@lamassu/ui-shared', () => {
+  describe('exports', () => {
+    it('should export version', () => {
+      expect(version).toBe('0.1.0')
+    })
+  })
+
+  // TODO: Add tests when Vue components are implemented
+  describe('placeholder', () => {
+    it('should pass placeholder test', () => {
+      expect(true).toBe(true)
+    })
+  })
+})