Added test files

Test files/asa_test_input

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+ This is the first line of the file. We'll start it with a space.
+0This is the second line. We'll print a newline first.
+0This is the third line. We'll also print a newline here.
+ This is the fourth line. We're not putting a newline first.
+0This is the fifth line. It shouldn't be visible.
++This is the sixth line. It should overwrite the fifth line.
+1This is the seventh line. It should be on a new page.
+0This is the eight line. It's also the last line.

Test files/expand_test_input

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+Name	Age	Height	Weight
+Wynter	20	175.2	68.2
+Ryver	20	178.3	71.1
+Fenris	20	201.5	173.5
+Arc	20	183.3	82.1

Test files/testfile

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+Help me
+I'm trapped in a text factory

Test files/text_one

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+Hi, there!
+This is a test document;
+To continue, press [RET]...

Test files/text_one_clone

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+Hi, there!
+This is a test document;
+To continue, press [RET]...

Test files/text_three

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+Hi, there!
+This document is not identical in
+length to either document one or two

Test files/text_two

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+Hi, there!
+This document is identical
+in length to document_one