tests: dex idl generation scaffolding

tests/custom-coder/programs/dex/Cargo.toml

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+[package]
+name = "dex"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "dex"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+default = []
+
+[dependencies]
+anchor-lang = "0.20.1"

tests/custom-coder/programs/dex/Xargo.toml

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+[target.bpfel-unknown-unknown.dependencies.std]
+features = []

tests/custom-coder/programs/dex/src/lib.rs

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+use anchor_lang::prelude::*;
+
+declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
+
+// TODO: add a dumy instruction and accounts context to generate the
+//       the idl for the dex program.
+
+#[program]
+pub mod dex {
+    use super::*;
+    pub fn initialize(ctx: Context<Initialize>) -> ProgramResult {
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct Initialize {}