test: add Descriptor predicate tests

components/chainhook-sdk/src/chainhooks/bitcoin/tests.rs

@@ -57,6 +57,47 @@ fn test_opreturn_evaluation(script_pubkey: &str, rule: MatchingRule, matches: bo
     script_pubkey_evaluation(OutputPredicate::OpReturn(rule), script_pubkey, matches)
 }
 
+// Descriptor test cases have been taken from
+// https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md#examples
+// To generate the address run:
+// `bdk-cli -n testnet wallet --descriptor <descriptor> get_new_address`
+#[test_case(
+    "tb1q0ht9tyks4vh7p5p904t340cr9nvahy7um9zdem",
+    "wpkh(02f9308a019258c31049344f85f89d5229b531c845836f99b08601f113bce036f9)";
+    "Descriptor: P2WPKH"
+)]
+#[test_case(
+    "2NBtBzAJ84E3sTy1KooEHYVwmMhUVdJAyEa",
+    "sh(wpkh(03fff97bd5755eeea420453a14355235d382f6472f8568a18b2f057a1460297556))";
+    "Descriptor: P2SH-P2WPKH"
+)]
+#[test_case(
+    "tb1qwu7hp9vckakyuw6htsy244qxtztrlyez4l7qlrpg68v6drgvj39qya5jch",
+    "wsh(multi(2,03a0434d9e47f3c86235477c7b1ae6ae5d3442d49b1943c2b752a68e2a47e247c7,03774ae7f858a9411e5ef4246b70c65aac5649980be5c17891bbec17895da008cb,03d01115d548e7561b15c38f004d734633687cf4419620095bc5b0f47070afe85a))";
+    "Descriptor: P2WSH 2-of-3 multisig output"
+)]
+fn test_descriptor_evaluation(addr: &str, expr: &str) {
+    // turn the address into a script_pubkey with a 0x prefix, as expected by the evaluator.
+    let script_pubkey = Address::from_str(addr).unwrap().script_pubkey();
+    let matching_script_pubkey = format!("0x{}", hex::encode(script_pubkey));
+
+    let rule = DescriptorMatchingRule {
+        expression: expr.to_string(),
+        // TODO: test ranges
+        range: None,
+    };
+
+    // matching against the script_pubkey generated from the address should match.
+    script_pubkey_evaluation(
+        OutputPredicate::Descriptor(rule.clone()),
+        &matching_script_pubkey,
+        true,
+    );
+
+    // matching against a fake script_pubkey should not match.
+    script_pubkey_evaluation(OutputPredicate::Descriptor(rule.clone()), "0xffff", false);
+}
+
 // script_pubkey_evaluation is a helper that evaluates a a script_pubkey against a transaction predicate.
 fn script_pubkey_evaluation(output: OutputPredicate, script_pubkey: &str, matches: bool) {
     let predicate = BitcoinPredicateType::Outputs(output);