Add unit tests

Makefile

@@ -0,0 +1,74 @@
+# Makefile for open-mcp-auth-proxy
+
+# Variables
+BINARY_NAME := openmcpauthproxy
+GO := go
+GOFMT := gofmt
+GOVET := go vet
+GOTEST := go test
+GOLINT := golangci-lint
+GOCOV := go tool cover
+BUILD_DIR := build
+
+# Source files
+SRC := $(shell find . -name "*.go" -not -path "./vendor/*")
+PKGS := $(shell go list ./... | grep -v /vendor/)
+
+# Set build options
+BUILD_OPTS := -v
+
+# Set test options
+TEST_OPTS := -v -race
+
+.PHONY: all build clean test fmt lint vet coverage help
+
+# Default target
+all: lint test build
+
+# Build the application
+build: 
+	@echo "Building $(BINARY_NAME)..."
+	@mkdir -p $(BUILD_DIR)
+	$(GO) build $(BUILD_OPTS) -o $(BUILD_DIR)/$(BINARY_NAME) ./cmd/proxy
+
+# Clean build artifacts
+clean:
+	@echo "Cleaning build artifacts..."
+	@rm -rf $(BUILD_DIR)
+	@rm -f coverage.out
+
+# Run tests
+test:
+	@echo "Running tests..."
+	$(GOTEST) $(TEST_OPTS) ./...
+
+# Run tests with coverage report
+coverage:
+	@echo "Running tests with coverage..."
+	@$(GOTEST) -coverprofile=coverage.out ./...
+	@$(GOCOV) -func=coverage.out
+	@$(GOCOV) -html=coverage.out -o coverage.html
+	@echo "Coverage report generated in coverage.html"
+
+# Run gofmt
+fmt:
+	@echo "Running gofmt..."
+	@$(GOFMT) -w -s $(SRC)
+
+# Run go vet
+vet:
+	@echo "Running go vet..."
+	@$(GOVET) ./...
+
+# Show help
+help:
+	@echo "Available targets:"
+	@echo "  all        : Run lint, test, and build"
+	@echo "  build      : Build the application"
+	@echo "  clean      : Clean build artifacts"
+	@echo "  test       : Run tests"
+	@echo "  coverage   : Run tests with coverage report"
+	@echo "  fmt        : Run gofmt"
+	@echo "  lint       : Run golangci-lint"
+	@echo "  vet        : Run go vet"
+	@echo "  help       : Show this help message"