Fix PriceIsRightTest fuzzing issue

[jmakwana01]

PR: Fix fuzzing in PriceIsRightTest

Closes: #47 #46

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What changed

• Constrained fuzzing range with vm.assume(amount <= 10 ether)
• Ensured the test contract always has enough ETH for any fuzz input (vm.deal(address(this), amount + 1 ether))
• Kept the invariant check: 1 ether should succeed, everything else should revert

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Why
The old fuzz test failed because Foundry would generate massive values for amount that couldn’t even be sent as msg.value.
This caused the revert to happen before reaching the contract, making the test misleading.

Now, fuzzing is limited to a realistic range, and the contract always has enough ETH to pay for the call.
This way the test actually checks the intended logic:

• ✅ succeeds when exactly 1 ether is sent
• ❌ reverts when anything else is sent

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How to test
Run:

forge test

Expected:

• All tests pass
• Fuzzing explores 0–10 ether range