fix: Failing Tests if home is a git directory (#214)

CONTRIBUTING.md

@@ -70,6 +70,8 @@ Unit tests are written using the built-in Rust testing library in the same file
 
 Unit tests should be fully isolated, only testing a given function's expected output given a specific input, and should be reproducible on any machine. Unit tests should not expect the computer running them to be in any particular state. This includes having any applications pre-installed, having any environment variables set, etc.
 
+The previous point should be emphasized: even seemingly innocuous ideas like "if we can see the directory, we can read it" or "nobody will have their home directory be a git repo" have bitten us in the past. Having even a single test fail can completely break installation on some platforms, so be careful with tests!
+
 ### Acceptance Testing
 
 Acceptance tests are located in the [`tests/`](tests) directory and are also written using the built-in Rust testing library.

tests/testsuite/directory.rs

@@ -12,6 +12,10 @@ use crate::common::{self, TestCommand};
 fn home_directory() -> io::Result<()> {
     let output = common::render_module("directory")
         .arg("--path=~")
+        .use_config(toml::toml! { // Necessary if homedir is a git repo
+            [directory]
+            truncate_to_repo = false
+        })
         .output()?;
     let actual = String::from_utf8(output.stdout).unwrap();