feat: Add comprehensive tests and ensure Go 1.22.2 compatibility

Dockerfile

@@ -0,0 +1,32 @@
+# 1. Base Image
+FROM golang:1.22.2-alpine
+
+# 2. Working Directory
+WORKDIR /app
+
+# 3. Install Git
+# git is useful for go modules that might be fetched directly from repositories
+# and also for version control information if your build process uses it.
+RUN apk add --no-cache git
+
+# 4. Copy Dependency Files
+# Copy go.mod and go.sum first to leverage Docker layer caching for dependencies.
+COPY go.mod go.sum ./
+
+# 5. Download Dependencies
+RUN go mod download
+
+# 6. Copy Source Code
+# Copy all .go files (source and test files)
+COPY ./*.go ./
+
+# 7. Run Tests
+# The integration tests will build the 'ab-proxy' binary as needed within their test setup.
+# Using -v for verbose output.
+# A non-zero exit code from `go test` will cause this RUN step to fail,
+# which in turn will cause the `docker build` to fail if tests don't pass.
+# If this Dockerfile is intended to be run (docker run image_name), 
+# then CMD should be used. For a test-during-build scenario, RUN is appropriate.
+# For the request "The Docker image built from this Dockerfile should, when run, execute all tests",
+# we should use CMD.
+CMD ["go", "test", "-v", "./..."]