diff --git a/test/Dockerfile b/test/Dockerfile
new file mode 100644
index 0000000..8ba3278
--- /dev/null
+++ b/test/Dockerfile
@@ -0,0 +1,26 @@
+# Dockerfile to test the library with multiple versions of PowerShell >= 7.
+#
+# Example run (from repo root):
+# > $version="7.1.5"; docker build -f .\test\docker\Dockerfile . -t powershell-featureflags-test:$version --build-arg VERSION=$version --build-arg UBUNTU_VERSION=18.04 && docker run powershell-featureflags-test:$version
+
+ARG VERSION=7.2.5
+ARG UBUNTU_VERSION=16.04
+FROM mcr.microsoft.com/powershell:${VERSION}-ubuntu-${UBUNTU_VERSION}
+
+# Install dotnet SDK.
+#
+# Not using the dotnet SDK images because they bring their own powershell,
+# see for example https://github.com/dotnet/dotnet-docker/blob/main/src/sdk/6.0/focal/amd64/Dockerfile.
+ENV DOTNET_SDK_VERSION=6.0.301 
+RUN curl -fSL --output dotnet.tar.gz https://dotnetcli.azureedge.net/dotnet/Sdk/$DOTNET_SDK_VERSION/dotnet-sdk-$DOTNET_SDK_VERSION-linux-x64.tar.gz
+RUN mkdir -p /usr/share/dotnet
+RUN tar -oxzf dotnet.tar.gz -C /usr/share/dotnet
+RUN rm dotnet.tar.gz
+RUN ln -s /usr/share/dotnet/dotnet /usr/bin/dotnet
+
+# Copy the application code.
+WORKDIR /app
+COPY . .
+
+# Restore dependencies and run tests.
+CMD pwsh tools/restore.ps1; pwsh tools/run-tests.ps1
\ No newline at end of file
diff --git a/tools/run-tests.ps1 b/tools/run-tests.ps1
index 7f3f5d2..bcaadfb 100644
--- a/tools/run-tests.ps1
+++ b/tools/run-tests.ps1
@@ -1,19 +1,12 @@
-# Mostly for use of CI/CD. Install Pester and run tests.
-param (
-  # Set to true to install Pester 5.1.0, regardless of whether a Pester version
-  # is present in the environment.
-  [switch] $InstallPester = $false
-)
-
 $parentDir = Split-Path -Parent (Split-Path -Parent $PSCommandPath)
 $testDir = Join-Path $parentDir -ChildPath "test"
 
 # Debug info.
-$PSVersionTable | Out-String
-$RequiredPesterVersion = "5.3.3"
+Write-Host "PowerShell version" $PSVersionTable.PSVersion
 
+$RequiredPesterVersion = "5.3.3"
 $pesterVersions = Get-Module -ListAvailable | Where-Object {$_.Name -eq "Pester" -and $_.Version -eq $RequiredPesterVersion}
-
+$InstallPester = $false
 if ($pesterVersions.Count -eq 0) {
    Write-Warning "Pester $RequiredPesterVersion not found, installing it."
    $InstallPester = $true