Add test data.

bin/test

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+#!/usr/bin/env bash
+go test github.com/amyboyd/editorconfig-cli/editorconfig $*

editorconfig/tests/.editorconfig

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+root = true
+
+[*]
+indent_size = 4
+indent_style = spaces
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[keep-trailing-spaces]
+trim_trailing_whitespace = false

editorconfig/tests/a/b/c/.editorconfig

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+

editorconfig/tests/a/b/c/d/file.go

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+abc
+	def

editorconfig/tests/a/b/c/d/file.java

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+abc
+	def

editorconfig/tests/a/b/c/d/file.php

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+abc
+	def

editorconfig/tests/a/b/c/d/keep-trailing-spaces.txt

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+
+  asd

editorconfig/tests/a/b/c/file.java

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+abc
+	def

editorconfig/tests/a/b/file.go

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+abc
+	def

editorconfig/tests/a/b/file.java

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+abc
+	def

editorconfig/tests/a/b/has-root-config/.editorconfig

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+root = true
+
+[*]
+indent_style = spaces

editorconfig/tests/a/b/has-root-config/file.java

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+abc
+	def
+      indented 6 spaces but this should not be an error