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plan(#119): create task breakdown
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‎plan/ready/task.md‎

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# Task List: Issue #119 — Add support for net9.0 and net10.0
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Cross-referenced against every acceptance criterion in `plan/ready/brief.md`.
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---
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## 1 — Main library: target frameworks
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**File:** `HdrHistogram/HdrHistogram.csproj`
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- [ ] **1.1** Change `<TargetFrameworks>` on line 4 from `net8.0;netstandard2.0` to
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`net10.0;net9.0;net8.0;netstandard2.0`.
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Verify: the element reads exactly `<TargetFrameworks>net10.0;net9.0;net8.0;netstandard2.0</TargetFrameworks>`.
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- [ ] **1.2** Add two `<PropertyGroup>` conditions for the Release `DocumentationFile`,
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mirroring the existing block at lines 24–26.
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Add one block for `net9.0` (`bin\Release\net9.0\HdrHistogram.xml`) and one for
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`net10.0` (`bin\Release\net10.0\HdrHistogram.xml`), immediately after the
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existing `net8.0` block.
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Verify: both new blocks are present and follow the same pattern as the `net8.0` block.
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> Covers acceptance criteria: **AC-1** (`HdrHistogram.csproj` targets all four TFMs),
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> **AC-8** (`dotnet pack` produces assemblies for all four targets).
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---
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## 2 — Unit tests: target frameworks
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**File:** `HdrHistogram.UnitTests/HdrHistogram.UnitTests.csproj`
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- [ ] **2.1** Change `<TargetFrameworks>` on line 4 from `net8.0` to
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`net10.0;net9.0;net8.0`.
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Verify: the element reads exactly `<TargetFrameworks>net10.0;net9.0;net8.0</TargetFrameworks>`.
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> Covers acceptance criteria: **AC-2**, **AC-7** (`dotnet test` on all three runtimes),
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> **AC-9** (no regressions).
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---
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## 3 — Examples project: target framework
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**File:** `HdrHistogram.Examples/HdrHistogram.Examples.csproj`
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- [ ] **3.1** Change `<TargetFrameworks>` on line 5 from `net8.0` to `net10.0`.
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Verify: the element reads exactly `<TargetFrameworks>net10.0</TargetFrameworks>`.
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> Covers acceptance criterion: **AC-3**.
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---
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## 4 — Benchmarking project: target frameworks and BenchmarkDotNet compatibility
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**File:** `HdrHistogram.Benchmarking/HdrHistogram.Benchmarking.csproj`
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- [ ] **4.1** Change `<TargetFrameworks>` on line 5 from `net8.0` to
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`net10.0;net9.0;net8.0`.
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Verify: the element reads exactly `<TargetFrameworks>net10.0;net9.0;net8.0</TargetFrameworks>`.
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- [ ] **4.2** Attempt a Release build of the benchmarking project:
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```bash
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dotnet build HdrHistogram.Benchmarking/HdrHistogram.Benchmarking.csproj -c Release
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```
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If the build succeeds, this task is done — BenchmarkDotNet 0.13.12 is compatible.
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If the build fails due to BenchmarkDotNet incompatibility with net10.0, proceed to task 4.3.
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- [ ] **4.3** *(Conditional — only if task 4.2 fails)* Upgrade both
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`BenchmarkDotNet` and `BenchmarkDotNet.Diagnostics.Windows` to the latest
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stable version.
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Verify: `dotnet build HdrHistogram.Benchmarking/HdrHistogram.Benchmarking.csproj -c Release`
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succeeds after the upgrade.
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Note: if this task is executed, also complete task 10.6 in the spec section below.
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> Covers acceptance criteria: **AC-4**, **AC-6** (`dotnet build` succeeds for all TFMs).
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---
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## 5 — CI pipeline: multi-version SDK install
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**File:** `.github/workflows/ci.yml`
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- [ ] **5.1** Replace the `setup-dotnet` step (lines 15–19) with a single step using
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a multi-line `dotnet-version` scalar:
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```yaml
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- uses: actions/setup-dotnet@v4
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with:
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dotnet-version: |
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8.0.x
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9.0.x
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10.0.x
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cache: true
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cache-dependency-path: '**/*.csproj'
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```
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Do **not** use separate `setup-dotnet` steps — that would break `cache: true`.
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Verify: the file contains exactly one `setup-dotnet` step, and `dotnet-version`
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is a multi-line block scalar listing all three versions.
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> Covers acceptance criterion: **AC-5**.
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---
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## 6 — Devcontainer: upgrade base image and install additional runtimes
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**File:** `.devcontainer/Dockerfile`
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- [ ] **6.1** Change the `FROM` line (line 5) from
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`mcr.microsoft.com/dotnet/sdk:9.0-bookworm-slim` to
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`mcr.microsoft.com/dotnet/sdk:10.0-bookworm-slim`.
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Verify: the first `FROM` line references `sdk:10.0-bookworm-slim`.
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- [ ] **6.2** Replace the single 8.0 runtime install (lines 6–8) with explicit
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installs of both the 8.0 and 9.0 runtimes via `dotnet-install.sh`, keeping both
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in the same `RUN` layer to avoid creating extra image layers:
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```dockerfile
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RUN dotnet_version=8.0 \
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&& curl -sSL https://dot.net/v1/dotnet-install.sh | bash /dev/stdin \
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--runtime dotnet --channel $dotnet_version --install-dir /usr/share/dotnet \
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&& dotnet_version=9.0 \
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&& curl -sSL https://dot.net/v1/dotnet-install.sh | bash /dev/stdin \
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--runtime dotnet --channel $dotnet_version --install-dir /usr/share/dotnet
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```
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Verify: the file installs both 8.0 and 9.0 runtimes, and the base image is 10.0.
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> Covers acceptance criterion: **AC-6** (devcontainer uses `sdk:10.0-bookworm-slim`
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> with 8.0 and 9.0 runtimes installed).
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---
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## 7 — Spec: main library TargetFrameworks
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**File:** `spec/tech-standards/build-system.md`, approx. lines 24–26
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- [ ] **7.1** In the "Main Library (HdrHistogram.csproj)" section, update the XML
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code block from:
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```xml
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<TargetFrameworks>net8.0;netstandard2.0</TargetFrameworks>
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```
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to:
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```xml
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<TargetFrameworks>net10.0;net9.0;net8.0;netstandard2.0</TargetFrameworks>
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```
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Verify: the code block in that section reflects all four targets in the correct order.
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> Covers acceptance criterion: **AC-10** (spec updated at specified locations).
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---
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## 8 — Spec: test project TargetFramework
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**File:** `spec/tech-standards/build-system.md`, approx. lines 35–37
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- [ ] **8.1** In the "Test Project" section, update the XML code block from:
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```xml
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<TargetFramework>net8.0</TargetFramework>
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```
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to:
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```xml
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<TargetFrameworks>net10.0;net9.0;net8.0</TargetFrameworks>
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```
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Note: the element name changes from the singular `TargetFramework` to the plural
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`TargetFrameworks` to match a multi-target declaration.
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Verify: the code block in that section shows all three targets.
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> Covers acceptance criterion: **AC-10**.
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---
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## 9 — Spec: benchmarking project TargetFrameworks
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**File:** `spec/tech-standards/build-system.md`, approx. lines 42–45
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- [ ] **9.1** In the "Benchmarking Project" section, update the description text
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"Targets the current LTS runtime only (developer tool, not a shipped library):" to
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reflect multi-targeting, and update the XML code block from:
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```xml
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<TargetFrameworks>net8.0</TargetFrameworks>
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```
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to:
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```xml
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<TargetFrameworks>net10.0;net9.0;net8.0</TargetFrameworks>
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```
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Verify: both the description and the code block are updated.
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> Covers acceptance criterion: **AC-10**.
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---
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## 10 — Spec: benchmark configuration runtime list
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**File:** `spec/tech-standards/build-system.md`, approx. lines 226–228
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- [ ] **10.1** In the "Benchmark Configuration" section, replace the single target entry:
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```
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- `net8.0` (current LTS runtime)
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```
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with a list of all three supported runtimes:
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```
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- `net10.0` (current LTS runtime)
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- `net9.0` (STS runtime)
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- `net8.0` (LTS runtime)
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```
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Verify: the bullet list covers all three TFMs.
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- [ ] **10.2** *(Conditional — only if task 4.3 was executed)* Update the BenchmarkDotNet
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version numbers in the "Benchmarking Project" dependencies code block
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(approx. lines 66–67) to match the upgraded version.
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Verify: the version string in the spec matches the version in
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`HdrHistogram.Benchmarking/HdrHistogram.Benchmarking.csproj`.
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> Covers acceptance criterion: **AC-10**.
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---
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## 11 — Spec: prerequisites
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**File:** `spec/tech-standards/build-system.md`, approx. line 254
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- [ ] **11.1** In the "Prerequisites" section, change:
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```
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- .NET 8.0 SDK (or later)
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```
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to:
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```
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- .NET 10.0 SDK (or later)
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```
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Verify: the prerequisites list references .NET 10.0 SDK.
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> Covers acceptance criterion: **AC-10**.
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---
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## 12 — Verification: build, test, and pack
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These tasks confirm all acceptance criteria related to running the toolchain.
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They must be performed **after** all implementation tasks above are complete.
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- [ ] **12.1** Run a Release build of the main library and confirm it succeeds for
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all four target frameworks:
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```bash
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dotnet build HdrHistogram/HdrHistogram.csproj -c Release
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```
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Verify: build output shows `net10.0`, `net9.0`, `net8.0`, and `netstandard2.0`
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all built without errors.
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- [ ] **12.2** Run the full test suite and confirm all tests pass on all three
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modern runtimes:
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```bash
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dotnet test HdrHistogram.UnitTests/HdrHistogram.UnitTests.csproj -c Release
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```
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Verify: test results show three separate `net10.0`, `net9.0`, and `net8.0` runs,
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all green with zero failures.
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- [ ] **12.3** Pack the library and confirm all four TFM folders are present in
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the produced `.nupkg`:
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```bash
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dotnet pack HdrHistogram/HdrHistogram.csproj -c Release --no-build
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```
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Then inspect the package:
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```bash
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unzip -l HdrHistogram/bin/Release/HdrHistogram.*.nupkg | grep "^.*lib/"
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```
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Verify: the archive contains `lib/net8.0/`, `lib/net9.0/`, `lib/net10.0/`,
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and `lib/netstandard2.0/` folders.
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> Covers acceptance criteria: **AC-6** (build succeeds), **AC-7** (tests pass on
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> all runtimes), **AC-8** (pack contains all four targets), **AC-9** (no regressions).
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---
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## Acceptance Criterion Cross-Reference
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| Criterion | Tasks |
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|-----------|-------|
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| AC-1: `HdrHistogram.csproj` targets `net10.0;net9.0;net8.0;netstandard2.0` | 1.1 |
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| AC-2: `HdrHistogram.UnitTests.csproj` targets `net10.0;net9.0;net8.0` | 2.1 |
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| AC-3: `HdrHistogram.Examples.csproj` targets `net10.0` | 3.1 |
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| AC-4: `HdrHistogram.Benchmarking.csproj` targets `net10.0;net9.0;net8.0` | 4.1 |
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| AC-5: CI installs SDKs 8.0.x, 9.0.x, 10.0.x via single `setup-dotnet` step | 5.1 |
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| AC-6: `.devcontainer/Dockerfile` uses `sdk:10.0-bookworm-slim` + 8.0 and 9.0 runtimes | 6.1, 6.2 |
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| AC-6b: `dotnet build -c Release` succeeds for all TFMs | 4.2, 12.1 |
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| AC-7: `dotnet test` passes on net8.0, net9.0, net10.0 | 12.2 |
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| AC-8: `dotnet pack` produces `.nupkg` with all four target folders | 1.2, 12.3 |
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| AC-9: No regressions — all existing tests pass on all targets | 12.2 |
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| AC-10: `spec/tech-standards/build-system.md` updated at all five locations | 7.1, 8.1, 9.1, 10.1, 11.1 |

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