Dockerfile.test

# Dockerfile.test — Docker test environment for reproducible E2E testing
# Builds a test runner image with Go toolchain and linting tools.
# Source code is mounted at runtime via docker-compose, not copied into the image.

FROM golang:1.25-bookworm

# Pin tool versions to match CI (.github/workflows/ci.yml)
ARG GOFUMPT_VERSION=v0.7.0
ARG GOLANGCI_LINT_VERSION=v2.1.6

# Install gofumpt and golangci-lint
RUN go install mvdan.cc/gofumpt@${GOFUMPT_VERSION} && \
    go install github.com/golangci/golangci-lint/v2/cmd/golangci-lint@${GOLANGCI_LINT_VERSION}

# Set up working directory
WORKDIR /app

# Cache Go module dependencies
# Copy only module files first to leverage Docker layer caching
COPY go.mod go.sum ./
RUN go mod download

# Create non-root user for test execution
RUN groupadd --gid 1001 testuser && \
    useradd --uid 1001 --gid 1001 --create-home testuser && \
    mkdir -p /app/test-results && \
    chown -R testuser:testuser /app

USER testuser

# Default environment for test execution
ENV CGO_ENABLED=0
ENV CI=true

# Default command runs the full test suite with coverage
CMD ["go", "test", "./...", "-v", "-count=1", "-timeout", "5m", "-coverprofile=test-results/coverage.out"]