added tests for pcp -t -I $file determination mode

tests/unittests.cfg

@@ -114,6 +114,34 @@ dxmorg@florida.cops.gov
   expect = /Public keys: 0/
 </test>
 
+
+#
+# test file determination
+<test check-determine-pub>
+  cmd = $pcp -t -I unknown1
+  expect = /Niemand/
+</test>
+
+<test check-determine-sec>
+  cmd = $pcp -t -I unknown2
+  expect = /secret key/
+</test>
+
+<test check-determine-empty-vault>
+  cmd = $pcp -t -I unknown3
+  expect = /empty/
+</test>
+
+<test check-determine-encrypted-file>
+  cmd = $pcp -t -I unknown4
+  expect = /encrypted/
+</test>
+
+<test check-determine-signature>
+  cmd = $pcp -t -I unknown5
+  expect = /ed25519/
+</test>
+
 #
 # encryption tests
 <test check-crypto-alicia-init>