Skip snapshot test if Git is not available

closes #161

Cargo.toml

@@ -7,7 +7,7 @@ license = "MIT/Apache-2.0"
 name = "bat"
 readme = "README.md"
 repository = "https://github.com/sharkdp/bat"
-version = "0.4.0"
+version = "0.4.1"
 exclude = [
     "assets/syntaxes/*",
     "assets/themes/*",

tests/tester.rs

@@ -11,7 +11,7 @@ pub struct BatTester {
 impl BatTester {
     pub fn new() -> Self {
         modify_sample_file();
-        // Lifted from fd :)
+
         let root = env::current_exe()
             .expect("tests executable")
             .parent()

tests/tests.rs

@@ -1,5 +1,6 @@
 mod tester;
 
+use std::process::{Command, Stdio};
 use tester::BatTester;
 
 static STYLES: &'static [&'static str] = &[
@@ -24,6 +25,17 @@ static STYLES: &'static [&'static str] = &[
 
 #[test]
 fn test_snapshots() {
+    let status = Command::new("git")
+        .arg("rev-parse")
+        .stdout(Stdio::null())
+        .stderr(Stdio::null())
+        .status();
+
+    if !status.map(|s| s.success()).unwrap_or(false) {
+        // Git not available or not a git repository. Skipping snapshot test.
+        return;
+    }
+
     let bat_tester = BatTester::new();
 
     for style in STYLES {