Transform dotnet test output (TRX) to jUnit format for CI purposes.

trx-to-junit.xslt

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:a ="http://microsoft.com/schemas/VisualStudio/TeamTest/2006" xmlns:b ="http://microsoft.com/schemas/VisualStudio/TeamTest/2010" >
  <xsl:output method="xml" indent="yes" />
  <xsl:template match="/">
    <testsuites>
      <xsl:variable name="buildName" select="//a:TestRun/@name"/>
      <xsl:variable name="numberOfTests" select="count(//a:UnitTestResult/@testId) + count(//b:UnitTestResult/@testId)"/>
      <xsl:variable name="numberOfFailures" select="count(//a:UnitTestResult/@outcome[.='Failed']) + count(//b:UnitTestResult/@outcome[.='Failed'])" />
      <xsl:variable name="numberOfErrors" select="count(//a:UnitTestResult[not(@outcome)]) + count(//b:UnitTestResult[not(@outcome)])" />
      <xsl:variable name="numberSkipped" select="count(//a:UnitTestResult/@outcome[.!='Passed' and .!='Failed']) + count(//b:UnitTestResult/@outcome[.!='Passed' and .!='Failed'])" />
      <testsuite name="MSTestSuite"
				tests="{$numberOfTests}"
				time="0"
				failures="{$numberOfFailures}"
				errors="{$numberOfErrors}"
				skipped="{$numberSkipped}">

        <xsl:for-each select="//a:UnitTestResult">
          <xsl:variable name="testName" select="@testName"/>
          <xsl:variable name="executionId" select="@executionId"/>
          <xsl:variable name="totalduration">
            <xsl:choose>
              <xsl:when test="@duration">
                <xsl:variable name="duration_seconds" select="substring(@duration, 7)"/>
                <xsl:variable name="duration_minutes" select="substring(@duration, 4,2 )"/>
                <xsl:variable name="duration_hours" select="substring(@duration, 1, 2)"/>
                <xsl:value-of select="$duration_hours*3600 + $duration_minutes*60 + $duration_seconds"/>
              </xsl:when>
              <xsl:otherwise>
                <xsl:variable name="d_seconds" select="substring(@endTime, 18,10) - substring(@startTime, 18,10)"/>
                <xsl:variable name="d_minutes" select="substring(@endTime, 15,2) - substring(@startTime, 15,2 )"/>
                <xsl:variable name="d_hours" select="substring(@endTime, 12,2) - substring(@startTime, 12, 2)"/>
                <xsl:value-of select="$d_hours*3600 + $d_minutes*60 + $d_seconds"/>
              </xsl:otherwise>
            </xsl:choose>
          </xsl:variable>
          <xsl:variable name="outcome">
            <xsl:choose>
              <xsl:when test="@outcome">
                <xsl:value-of select="@outcome"/>
              </xsl:when>
              <xsl:otherwise>
                <xsl:value-of select="'Error'"/>
              </xsl:otherwise>
            </xsl:choose>
          </xsl:variable>
          <xsl:variable name="message" select="a:Output/a:ErrorInfo/a:Message"/>
          <xsl:variable name="stacktrace" select="a:Output/a:ErrorInfo/a:StackTrace"/>
          <xsl:for-each select="//a:UnitTest">
            <xsl:variable name="currentExecutionId" select="a:Execution/@id"/>
            <xsl:if test="$currentExecutionId = $executionId" >
              <xsl:variable name="className" select="substring-before(a:TestMethod/@className, ',')"/>
              <testcase classname="{$className}"
                name="{$testName}"
                time="{$totalduration}">

                <xsl:if test="contains($outcome, 'Failed')">
                  <failure>
                    MESSAGE:
                    <xsl:value-of select="$message" />
                    +++++++++++++++++++
                    STACK TRACE:
                    <xsl:value-of select="$stacktrace" />
                  </failure>
                </xsl:if>
                <xsl:if test="contains($outcome, 'Error')">
                  <error>
                    MESSAGE:
                    <xsl:value-of select="$message" />
                    +++++++++++++++++++
                    STACK TRACE:
                    <xsl:value-of select="$stacktrace" />
                  </error>
                </xsl:if>
              </testcase>
            </xsl:if>
          </xsl:for-each>
        </xsl:for-each>

        <xsl:for-each select="//b:UnitTestResult">
          <xsl:variable name="testName" select="@testName"/>
          <xsl:variable name="executionId" select="@executionId"/>
          <xsl:variable name="testId" select="@testId"/>
          <xsl:variable name="totalduration">
            <xsl:choose>
              <xsl:when test="@duration">
                <xsl:variable name="duration_seconds" select="substring(@duration, 7)"/>
                <xsl:variable name="duration_minutes" select="substring(@duration, 4,2 )"/>
                <xsl:variable name="duration_hours" select="substring(@duration, 1, 2)"/>
                <xsl:value-of select="$duration_hours*3600 + $duration_minutes*60 + $duration_seconds"/>
              </xsl:when>
              <xsl:otherwise>
                <xsl:variable name="d_seconds" select="substring(@endTime, 18,10) - substring(@startTime, 18,10)"/>
                <xsl:variable name="d_minutes" select="substring(@endTime, 15,2) - substring(@startTime, 15,2 )"/>
                <xsl:variable name="d_hours" select="substring(@endTime, 12,2) - substring(@startTime, 12, 2)"/>
                <xsl:value-of select="$d_hours*3600 + $d_minutes*60 + $d_seconds"/>
              </xsl:otherwise>
            </xsl:choose>
          </xsl:variable>
          <xsl:variable name="outcome">
            <xsl:choose>
              <xsl:when test="@outcome">
                <xsl:value-of select="@outcome"/>
              </xsl:when>
              <xsl:otherwise>
                <xsl:value-of select="'Error'"/>
              </xsl:otherwise>
            </xsl:choose>
          </xsl:variable>
          <xsl:variable name="message" select="b:Output/b:ErrorInfo/b:Message"/>
          <xsl:variable name="stacktrace" select="b:Output/b:ErrorInfo/b:StackTrace"/>
          <xsl:for-each select="//b:UnitTest">
            <xsl:variable name="currentTestId" select="@id"/>
            <xsl:if test="$currentTestId = $testId" >
              <xsl:variable name="className" select="substring-before(b:TestMethod/@className, ',')"/>
              <testcase classname="{$className}"
                name="{$testName}"
                time="{$totalduration}"
									>

                <xsl:if test="contains($outcome, 'Failed')">
                  <failure>
                    MESSAGE:
                    <xsl:value-of select="$message" />
                    +++++++++++++++++++
                    STACK TRACE:
                    <xsl:value-of select="$stacktrace" />
                  </failure>
                </xsl:if>
                <xsl:if test="contains($outcome, 'Error')">
                  <error>
                    MESSAGE:
                    <xsl:value-of select="$message" />
                    +++++++++++++++++++
                    STACK TRACE:
                    <xsl:value-of select="$stacktrace" />
                  </error>
                </xsl:if>
              </testcase>
            </xsl:if>
          </xsl:for-each>
        </xsl:for-each>

      </testsuite>
    </testsuites>
  </xsl:template>
</xsl:stylesheet>

@shawnmclean I wrote a blog post when I posted this on how I use it (http://geeks.akinox.com/2017/03/17/migrating-dotnetcore/#dotnet-test-and-shippable) which might help, although a few months late!

@Alegrowin I use 2017 and have not had to change anything! I had to downgrade the version of xslt to 1, but otherwise made no change from the original file I had. Thanks for your contribution!