tests in the steel decimal crate with serious issue fixed

steel_decimal/Makefile

@@ -0,0 +1,28 @@
+# Simple Makefile for Steel Decimal
+
+# Production test settings
+export PROPTEST_CASES=10000
+export RUST_BACKTRACE=1
+
+.PHONY: test check
+
+# Run all tests with production settings
+test:
+	@echo "Running all tests..."
+	@cargo test --release
+
+# Quick development test
+test-dev:
+	@PROPTEST_CASES=100 cargo test
+
+# Check compilation
+check:
+	@cargo check
+
+# Clean build artifacts  
+clean:
+	@cargo clean
+
+# Run with specific test threads for concurrency tests
+test-concurrent:
+	@cargo test concurrency_tests --release -- --test-threads=1