Speed up Windows source fallback installs

install.ps1

@@ -427,10 +427,16 @@ function Install-FromSource {
 
     try {
         Push-Location $src
-        cargo build --release --bin dosh-client --bin dosh-bench
+        $buildArgs = @("build", "--release", "--bin", "dosh-client")
+        if ($Quiet) {
+            $buildArgs = @("build", "-q", "--release", "--bin", "dosh-client")
+        }
+        cargo @buildArgs
         Install-Binary "target\release\dosh-client.exe" (Join-Path $bindir "dosh-client.exe")
         Install-Binary "target\release\dosh-client.exe" (Join-Path $bindir "dosh.exe")
-        Install-Binary "target\release\dosh-bench.exe" (Join-Path $bindir "dosh-bench.exe")
+        if (Test-Path "target\release\dosh-bench.exe") {
+            Install-Binary "target\release\dosh-bench.exe" (Join-Path $bindir "dosh-bench.exe")
+        }
     }
     finally {
         Pop-Location

tests/release_scripts.rs

@@ -209,6 +209,27 @@ fn windows_installer_honors_quiet_update_mode() {
     );
 }
 
+#[test]
+fn windows_source_fallback_builds_client_only_like_unix() {
+    let install = include_str!("../install.sh");
+    let ps1 = include_str!("../install.ps1");
+    assert!(install.contains("cargo build -q --release --bin dosh-client"));
+    assert!(install.contains("cargo build --release --bin dosh-client"));
+    assert!(ps1.contains("$buildArgs = @(\"build\", \"--release\", \"--bin\", \"dosh-client\")"));
+    assert!(
+        ps1.contains(
+            "$buildArgs = @(\"build\", \"-q\", \"--release\", \"--bin\", \"dosh-client\")"
+        ),
+        "Windows quiet source fallback should use cargo -q like Unix"
+    );
+    assert!(ps1.contains("cargo @buildArgs"));
+    assert!(
+        !ps1.contains("cargo build --release --bin dosh-client --bin dosh-bench"),
+        "Windows client source fallback must not compile dosh-bench on every update"
+    );
+    assert!(ps1.contains("if (Test-Path \"target\\release\\dosh-bench.exe\")"));
+}
+
 #[test]
 fn windows_installer_adds_user_path_idempotently() {
     let ps1 = include_str!("../install.ps1");