diff --git a/.styleguide b/.styleguide
index 6ffecfdd..d0f7a4da 100644
--- a/.styleguide
+++ b/.styleguide
@@ -1,33 +1,7 @@
-cppHeaderFileInclude {
-  \.h$
-  \.hpp$
-  \.inc$
-}
-
-cppSrcFileInclude {
-  \.cpp$
-}
-
-# Extra "/" used by unit tests
 generatedFileExclude {
-  /cpplint\.py$
+  cpplint\.py$
 }
 
 modifiableFileExclude {
   \.png$
 }
-
-licenseUpdateExclude {
-  Excluded\.h$
-}
-
-# Ordered this way to ensure tests find longest match
-includeGuardRoots {
-  wpiformat/
-  wpiformat/Test/
-}
-
-# Used by unit tests
-includeProject {
-  ^ctre/
-}
diff --git a/.styleguide-license b/.styleguide-license
index a3fccde8..77684828 100644
--- a/.styleguide-license
+++ b/.styleguide-license
@@ -1,2 +1 @@
-/*{padding}Company Name{padding}*/
-/* Copyright (c) {year} Company Name. All Rights Reserved.{padding}*/
+// Copyright (c) {year} FIRST
diff --git a/wpiformat/wpiformat/test/tempdir.py b/wpiformat/wpiformat/test/tempdir.py
new file mode 100644
index 00000000..f4efc385
--- /dev/null
+++ b/wpiformat/wpiformat/test/tempdir.py
@@ -0,0 +1,16 @@
+import os
+import tempfile
+
+
+class OpenTemporaryDirectory():
+
+    def __init__(self):
+        self.prev_dir = os.getcwd()
+
+    def __enter__(self):
+        self.temp_dir = tempfile.TemporaryDirectory()
+        os.chdir(self.temp_dir.name)
+        return self.temp_dir
+
+    def __exit__(self, type, value, traceback):
+        os.chdir(self.prev_dir)
diff --git a/wpiformat/wpiformat/test/test_cidentlist.py b/wpiformat/wpiformat/test/test_cidentlist.py
index 4daf1063..816b9631 100644
--- a/wpiformat/wpiformat/test/test_cidentlist.py
+++ b/wpiformat/wpiformat/test/test_cidentlist.py
@@ -1,6 +1,7 @@
 import os
 
 from .tasktest import *
+from .tempdir import *
 from wpiformat.cidentlist import CIdentList
 
 
@@ -299,4 +300,16 @@ def test_cidentlist():
         "}" + os.linesep)
     test.add_latest_input_as_output(True)
 
-    test.run(OutputType.FILE)
+    with OpenTemporaryDirectory():
+        with open(".styleguide", "w") as file:
+            file.write(r"""cppHeaderFileInclude {
+  \.h$
+  \.hpp$
+  \.inc$
+}
+
+includeProject {
+  ^ctre/
+}
+""")
+        test.run(OutputType.FILE)
diff --git a/wpiformat/wpiformat/test/test_config.py b/wpiformat/wpiformat/test/test_config.py
index cd8a9b96..97c45570 100644
--- a/wpiformat/wpiformat/test/test_config.py
+++ b/wpiformat/wpiformat/test/test_config.py
@@ -1,18 +1,39 @@
-import os
-
+from .tempdir import *
 from wpiformat.config import Config
 
 
 def test_config():
-    config_file = Config(os.path.abspath(os.getcwd()), ".styleguide")
-    assert config_file.is_modifiable_file("." + os.sep + "wpiformat" + os.sep +
-                                          "javaguidelink.png")
-    assert config_file.is_generated_file("." + os.sep + "wpiformat" + os.sep +
-                                         "wpiformat" + os.sep + "cpplint.py")
+    with OpenTemporaryDirectory():
+        with open(".styleguide", "w") as file:
+            file.write(r"""cppHeaderFileInclude {
+  \.h$
+  \.inc$
+}
+
+cppSrcFileInclude {
+  \.cpp$
+}
+
+# Extra "/" used by unit tests
+generatedFileExclude {
+  /cpplint\.py$
+}
+
+modifiableFileExclude {
+  \.png$
+}
+""")
+
+        config_file = Config(os.path.abspath(os.getcwd()), ".styleguide")
+        assert config_file.is_modifiable_file("." + os.sep + "wpiformat" +
+                                              os.sep + "javaguidelink.png")
+        assert config_file.is_generated_file("." + os.sep + "wpiformat" +
+                                             os.sep + "wpiformat" + os.sep +
+                                             "cpplint.py")
 
-    assert not config_file.is_generated_file("." + os.sep + "wpiformat" +
-                                             os.sep + "diff_cpplint.py")
-    assert not config_file.is_generated_file("." + os.sep + "wpiformat" +
-                                             os.sep + "update_cpplint.py")
-    assert not config_file.is_modifiable_file("." + os.sep + "wpiformat" +
-                                              os.sep + "license.txt")
+        assert not config_file.is_generated_file("." + os.sep + "wpiformat" +
+                                                 os.sep + "diff_cpplint.py")
+        assert not config_file.is_generated_file("." + os.sep + "wpiformat" +
+                                                 os.sep + "update_cpplint.py")
+        assert not config_file.is_modifiable_file("." + os.sep + "wpiformat" +
+                                                  os.sep + "license.txt")
diff --git a/wpiformat/wpiformat/test/test_includeguard.py b/wpiformat/wpiformat/test/test_includeguard.py
index ffe2fbe6..ee44e325 100644
--- a/wpiformat/wpiformat/test/test_includeguard.py
+++ b/wpiformat/wpiformat/test/test_includeguard.py
@@ -1,6 +1,7 @@
 import os
 
 from .tasktest import *
+from .tempdir import *
 from wpiformat.includeguard import IncludeGuard
 from wpiformat.task import Task
 
@@ -8,78 +9,86 @@
 def test_includeguard():
     test = TaskTest(IncludeGuard())
 
-    repo_root = os.path.basename(Task.get_repo_root()).upper()
+    with OpenTemporaryDirectory():
+        with open(".styleguide", "w") as file:
+            # Roots are ordered this way to ensure tests find longest match
+            file.write(r"""includeGuardRoots {
+  wpiformat/
+  wpiformat/Test/
+}
+""")
+        repo_root = os.path.basename(Task.get_repo_root()).upper()
 
-    # Fix incorrect include guard
-    test.add_input("./Test.h",
-        "#ifndef WRONG_H" + os.linesep + \
-        "#define WRONG_C" + os.linesep + \
-        os.linesep + \
-        "#endif" + os.linesep)
-    test.add_output(
-        "#ifndef " + repo_root + "_TEST_H_" + os.linesep + \
-        "#define " + repo_root + "_TEST_H_" + os.linesep + \
-        os.linesep + \
-        "#endif  // " + repo_root + "_TEST_H_" + os.linesep, True, True)
+        # Fix incorrect include guard
+        test.add_input("./Test.h",
+            "#ifndef WRONG_H" + os.linesep + \
+            "#define WRONG_C" + os.linesep + \
+            os.linesep + \
+            "#endif" + os.linesep)
+        test.add_output(
+            "#ifndef " + repo_root + "_TEST_H_" + os.linesep + \
+            "#define " + repo_root + "_TEST_H_" + os.linesep + \
+            os.linesep + \
+            "#endif  // " + repo_root + "_TEST_H_" + os.linesep, True, True)
 
-    # Ensure nested preprocessor statements are handled properly for incorrect
-    # include guard
-    test.add_input("./Test.h",
-        "#ifndef WRONG_H" + os.linesep + \
-        "#define WRONG_C" + os.linesep + \
-        os.linesep + \
-        "#if SOMETHING" + os.linesep + \
-        "// do something" + os.linesep + \
-        "#endif" + os.linesep + \
-        "#endif" + os.linesep)
-    test.add_output(
-        "#ifndef " + repo_root + "_TEST_H_" + os.linesep + \
-        "#define " + repo_root + "_TEST_H_" + os.linesep + \
-        os.linesep + \
-        "#if SOMETHING" + os.linesep + \
-        "// do something" + os.linesep + \
-        "#endif" + os.linesep + \
-        "#endif  // " + repo_root + "_TEST_H_" + os.linesep, True, True)
+        # Ensure nested preprocessor statements are handled properly for incorrect
+        # include guard
+        test.add_input("./Test.h",
+            "#ifndef WRONG_H" + os.linesep + \
+            "#define WRONG_C" + os.linesep + \
+            os.linesep + \
+            "#if SOMETHING" + os.linesep + \
+            "// do something" + os.linesep + \
+            "#endif" + os.linesep + \
+            "#endif" + os.linesep)
+        test.add_output(
+            "#ifndef " + repo_root + "_TEST_H_" + os.linesep + \
+            "#define " + repo_root + "_TEST_H_" + os.linesep + \
+            os.linesep + \
+            "#if SOMETHING" + os.linesep + \
+            "// do something" + os.linesep + \
+            "#endif" + os.linesep + \
+            "#endif  // " + repo_root + "_TEST_H_" + os.linesep, True, True)
 
-    # Don't touch correct include guard
-    test.add_input("./Test.h",
-        "#ifndef " + repo_root + "_TEST_H_" + os.linesep + \
-        "#define " + repo_root + "_TEST_H_" + os.linesep + \
-        os.linesep + \
-        "#endif  // " + repo_root + "_TEST_H_" + os.linesep)
-    test.add_latest_input_as_output(True)
+        # Don't touch correct include guard
+        test.add_input("./Test.h",
+            "#ifndef " + repo_root + "_TEST_H_" + os.linesep + \
+            "#define " + repo_root + "_TEST_H_" + os.linesep + \
+            os.linesep + \
+            "#endif  // " + repo_root + "_TEST_H_" + os.linesep)
+        test.add_latest_input_as_output(True)
 
-    # Fail on missing include guard
-    test.add_input("./Test.h", "// Empty file" + os.linesep)
-    test.add_latest_input_as_output(False)
+        # Fail on missing include guard
+        test.add_input("./Test.h", "// Empty file" + os.linesep)
+        test.add_latest_input_as_output(False)
 
-    # Verify pragma once counts as include guard
-    test.add_input("./Test.h", "#pragma once" + os.linesep)
-    test.add_latest_input_as_output(True)
+        # Verify pragma once counts as include guard
+        test.add_input("./Test.h", "#pragma once" + os.linesep)
+        test.add_latest_input_as_output(True)
 
-    # Ensure include guard roots are processed correctly
-    test.add_input("./Test.h",
-        "#ifndef " + repo_root + "_WPIFORMAT_TEST_H_" + os.linesep + \
-        "#define " + repo_root + "_WPIFORMAT_TEST_H_" + os.linesep + \
-        os.linesep + \
-        "#endif  // " + repo_root + "_WPIFORMAT_TEST_H_" + os.linesep)
-    test.add_output(
-        "#ifndef " + repo_root + "_TEST_H_" + os.linesep + \
-        "#define " + repo_root + "_TEST_H_" + os.linesep + \
-        os.linesep + \
-        "#endif  // " + repo_root + "_TEST_H_" + os.linesep, True, True)
+        # Ensure include guard roots are processed correctly
+        test.add_input("./Test.h",
+            "#ifndef " + repo_root + "_WPIFORMAT_TEST_H_" + os.linesep + \
+            "#define " + repo_root + "_WPIFORMAT_TEST_H_" + os.linesep + \
+            os.linesep + \
+            "#endif  // " + repo_root + "_WPIFORMAT_TEST_H_" + os.linesep)
+        test.add_output(
+            "#ifndef " + repo_root + "_TEST_H_" + os.linesep + \
+            "#define " + repo_root + "_TEST_H_" + os.linesep + \
+            os.linesep + \
+            "#endif  // " + repo_root + "_TEST_H_" + os.linesep, True, True)
 
-    # Ensure leading underscores are removed (this occurs if the user doesn't
-    # include a trailing "/" in the include guard root)
-    test.add_input("./Test/Test.h",
-        "#ifndef " + repo_root + "_WPIFORMAT_TEST_TEST_H_" + os.linesep + \
-        "#define " + repo_root + "_WPIFORMAT_TEST_TEST_H_" + os.linesep + \
-        os.linesep + \
-        "#endif  // " + repo_root + "_WPIFORMAT_TEST_TEST_H_" + os.linesep)
-    test.add_output(
-        "#ifndef " + repo_root + "_TEST_H_" + os.linesep + \
-        "#define " + repo_root + "_TEST_H_" + os.linesep + \
-        os.linesep + \
-        "#endif  // " + repo_root + "_TEST_H_" + os.linesep, True, True)
+        # Ensure leading underscores are removed (this occurs if the user doesn't
+        # include a trailing "/" in the include guard root)
+        test.add_input("./Test/Test.h",
+            "#ifndef " + repo_root + "_WPIFORMAT_TEST_TEST_H_" + os.linesep + \
+            "#define " + repo_root + "_WPIFORMAT_TEST_TEST_H_" + os.linesep + \
+            os.linesep + \
+            "#endif  // " + repo_root + "_WPIFORMAT_TEST_TEST_H_" + os.linesep)
+        test.add_output(
+            "#ifndef " + repo_root + "_TEST_H_" + os.linesep + \
+            "#define " + repo_root + "_TEST_H_" + os.linesep + \
+            os.linesep + \
+            "#endif  // " + repo_root + "_TEST_H_" + os.linesep, True, True)
 
-    test.run(OutputType.FILE)
+        test.run(OutputType.FILE)
diff --git a/wpiformat/wpiformat/test/test_includeorder.py b/wpiformat/wpiformat/test/test_includeorder.py
index f0e80e1b..3ecd3b82 100644
--- a/wpiformat/wpiformat/test/test_includeorder.py
+++ b/wpiformat/wpiformat/test/test_includeorder.py
@@ -1,6 +1,7 @@
 import os
 
 from .tasktest import *
+from .tempdir import *
 from wpiformat.includeorder import IncludeOrder
 
 
@@ -546,4 +547,16 @@ def test_includeorder():
         "#endif" + os.linesep)
     test.add_latest_input_as_output(True)
 
-    test.run(OutputType.FILE)
+    with OpenTemporaryDirectory():
+        with open(".styleguide", "w") as file:
+            file.write(r"""cppHeaderFileInclude {
+  \.h$
+  \.hpp$
+  \.inc$
+}
+
+includeProject {
+  ^ctre/
+}
+""")
+        test.run(OutputType.FILE)
diff --git a/wpiformat/wpiformat/test/test_licenseupdate.py b/wpiformat/wpiformat/test/test_licenseupdate.py
index 5201fc13..2765e4dd 100644
--- a/wpiformat/wpiformat/test/test_licenseupdate.py
+++ b/wpiformat/wpiformat/test/test_licenseupdate.py
@@ -3,27 +3,13 @@
 from pathlib import Path
 import shutil
 import subprocess
-import tempfile
 
+from .tempdir import *
 from .tasktest import *
 from wpiformat.config import Config
 from wpiformat.licenseupdate import LicenseUpdate
 
 
-class OpenTemporaryDirectory():
-
-    def __init__(self):
-        self.prev_dir = os.getcwd()
-
-    def __enter__(self):
-        self.temp_dir = tempfile.TemporaryDirectory()
-        os.chdir(self.temp_dir.name)
-        return self.temp_dir
-
-    def __exit__(self, type, value, traceback):
-        os.chdir(self.prev_dir)
-
-
 def test_licenseupdate():
     year = str(date.today().year)
 
@@ -185,10 +171,6 @@ def test_licenseupdate():
         "/* Copyright (c) 1992-" + year + " Company Name. All Rights Reserved.                 */" + os.linesep + \
         os.linesep + file_appendix, True, True)
 
-    # Ensure excluded files won't be processed
-    config_file = Config(os.path.abspath(os.getcwd()), ".styleguide")
-    assert not task.should_process_file(config_file, "./Excluded.h")
-
     # Create git repo to test license years for commits
     with OpenTemporaryDirectory():
         subprocess.run(["git", "init", "-q"])
@@ -197,11 +179,26 @@ def test_licenseupdate():
         with open(".styleguide-license", "w") as file:
             file.write("// Copyright (c) {year}")
         with open(".styleguide", "w") as file:
-            file.write("cppSrcFileInclude {\n" + r"\.cpp$")
+            file.write(r"""cppHeaderFileInclude {
+  \.h$
+}
+
+cppSrcFileInclude {
+  \.cpp$
+}
+
+licenseUpdateExclude {
+  Excluded\.h$
+}
+""")
         subprocess.run(["git", "add", ".styleguide-license"])
         subprocess.run(["git", "add", ".styleguide"])
         subprocess.run(["git", "commit", "-q", "-m", "\"Initial commit\""])
 
+        # Ensure excluded files won't be processed
+        config_file = Config(os.path.abspath(os.getcwd()), ".styleguide")
+        assert not task.should_process_file(config_file, "./Excluded.h")
+
         # Add file with commit date of last year and range through this year
         with open("last-year.cpp", "w") as file:
             file.write(f"// Copyright (c) 2017-{year}")
@@ -276,4 +273,9 @@ def test_licenseupdate():
         output, success = task.run_pipeline(config_file, "no-year.cpp", lines)
         assert output == f"// Copyright (c) {year}\n\n"
 
-    test.run(OutputType.FILE)
+        with open(".styleguide-license", "w") as file:
+            file.write(r"""/*{padding}Company Name{padding}*/
+/* Copyright (c) {year} Company Name. All Rights Reserved.{padding}*/
+""")
+
+        test.run(OutputType.FILE)