Consolidated the test programs into one 'bgbench' program

src/tests/disk.rs

@@ -0,0 +1,29 @@
+use std::fs;
+use std::process::Command;
+
+// test disk write speeds by continually writing zeroes to it
+pub fn disk_write_test(tempfile: &str, size: &u8) {
+    // convert size in Gigabytes down to Megabytes
+    let size_gigs: u32 = (*size as u32 * 1024).into();
+
+    // run the dd command with a block size of 1 MB
+    let output = Command::new("dd")
+        .arg("bs=1M")
+        .arg(format!("count={}", size_gigs))
+        .arg("if=/dev/zero")
+        .arg(format!("of={}", tempfile))
+        .output()
+        .expect("Failed to execute command");
+
+    // check that the command succeeded
+    assert!(output.status.success());
+
+    // for whatever reason, `dd` output ends up in stderr
+    println!("{}", String::from_utf8_lossy(&output.stderr));
+
+    // remove the test file
+    match fs::remove_file(tempfile) {
+        Ok(()) => println!("Cleaning up..."),
+        Err(e) => println!("There was a problem during cleanup - {}", e),
+    }
+}