Add trivial test cases for abook, lftpget, and wtf.

test/completion/abook.exp

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+source "lib/completions/abook.exp"

test/completion/lftpget.exp

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+source "lib/completions/lftpget.exp"

test/completion/wtf.exp

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+source "lib/completions/wtf.exp"

test/lib/completions/abook.exp

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+proc setup {} {
+    save_env
+}; # setup()
+
+
+proc teardown {} {
+    assert_env_unmodified
+}; # teardown()
+
+
+setup
+
+
+assert_complete_any "abook "
+
+
+sync_after_int
+
+
+teardown

test/lib/completions/lftpget.exp

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+proc setup {} {
+    save_env
+}; # setup()
+
+
+proc teardown {} {
+    assert_env_unmodified
+}; # teardown()
+
+
+setup
+
+
+assert_complete_any "lftpget -"
+
+
+sync_after_int
+
+
+teardown

test/lib/completions/wtf.exp

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+proc setup {} {
+    save_env
+}; # setup()
+
+
+proc teardown {} {
+    assert_env_unmodified
+}; # teardown()
+
+
+setup
+
+
+assert_complete_any "wtf "
+
+
+sync_after_int
+
+
+teardown