Cannot run Maven using `mvn -D` argument within Microsoft Powershell, but works in Command Prompt

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I am trying to build our web project from the commandline but skipping the testing. I am using the command mvn clean install -Dmaven.test.skip=true.

When I run the command from the traditional black & white Command Prompt (aka DOS shell) the command works, but when I run it from the command from "Windows PowerShell" I get the following error:

[ERROR] Unknown lifecycle phase ".test.skip=true". You must specify a valid lifecycle phase or a goal in the format <plugin-prefix>:<goal> or <plugin-group-id>:<plugin- artifact-id>[:<plugin-version>]:<goal>. Available lifecycle phases are: validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepar e-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy, pre-site, site, post-site, site-deploy, pre-clean, clean, po st-clean. -> [Help 1]

What is causing this discrepancy and how do I get PowerShell to behave like the traditional Command Prompt?

This is running on Windows 7.

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