I've attached a patch for the first attempt at a test for insert_positions.
I think there is a bug in the last test case, so I haven't tried to check in.

Sven, could you look at it.

I think the output should look like:
+>line: {tst a}{.bC.cB.dA}
+>COMPADD:{}
+>INSERT_POSITIONS:{5:14}
+>NO:{aA.bC.cB.dA}
+>NO:{aD.bC.cB.dA}

But zsh seems to want to leave the cursor after the C, and insert_positions has
three values rather than 2.

-FR

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