VS2015+SSDT SQL Unit Tests 'INSERT INTO' syntax

[SQLUnitTester]

I'm having trouble using some of the newer/odder INSERT/SELECT INTO syntax's
They run just fine from a .SQL dialog from VS2015, but not within a SQL unit-test.
In all cases I am populating a temp table and using MSSQL 2015.

This standard syntax works just fine in both a SQL unit-test and as a SQL script in DevStudio;

INSERT INTO #Expect ([Name], [System_Type_Name]) VALUES ('Mail_Option', 'Varchar(20)'

However, these will not work in a unit-test but if you copy-n-paste into a script they work fine;

SELECT * INTO #Actual FROM OPENROWSET('sqlncli', 'server=xxx;Trusted_Connection=yes;','EXEC xxx')

or

INSERT INTO #Actual EXEC dbo.Xxx

The error is;

System.Data.SqlClient.SqlException: Incorrect syntax near the word 'INTO'.

Your help is appreciated.