diff --git a/src/core/wxc_common/tests/proxy_env_spec.rs b/src/core/wxc_common/tests/proxy_env_spec.rs
index 238f0db52..b68ddf96a 100644
--- a/src/core/wxc_common/tests/proxy_env_spec.rs
+++ b/src/core/wxc_common/tests/proxy_env_spec.rs
@@ -194,6 +194,36 @@ fn cooperative_env_scrubs_all_caller_supplied_proxy_keys() {
     assert_eq!(value_for(&result, "ftp_proxy"), Some(PROXY_URL));
 }
 
+// Protects clients (b), (c), and (d): the three key-set constants are the
+// contract, so this derives the expected state of every managed key from them
+// instead of naming keys by hand. A hand-written per-key expectation can
+// silently disagree with the constant that actually drives the behavior --
+// which is how an assertion that FTP_PROXY stays absent survived FTP_PROXY
+// being added to PROXY_SET_KEYS, leaving the suite asserting both at once.
+#[test]
+fn every_managed_key_lands_in_the_state_its_constants_dictate() {
+    let hostile = "http://attacker.example:9999";
+    let caller: Vec<String> = PROXY_ENV_KEYS
+        .iter()
+        .map(|key| format!("{key}={hostile}"))
+        .collect();
+
+    let result = apply_cooperative_proxy_env(&caller, PROXY_URL);
+
+    for key in PROXY_ENV_KEYS {
+        let expected = if PROXY_SET_KEYS.contains(key) {
+            Some(PROXY_URL)
+        } else if PROXY_NEUTRALIZE_KEYS.contains(key) {
+            Some("")
+        } else {
+            None
+        };
+        assert_eq!(value_for(&result, key), expected, "managed key {key}");
+    }
+
+    assert!(!result.iter().any(|entry| entry.contains(hostile)));
+}
+
 // Protects client (d): duplicate and mixed-case proxy keys are an obvious
 // evasion attempt. Neither the second copy nor an unusual casing survives with
 // the workload's value.
diff --git a/tests/configs/wslc_filesystem.json b/tests/configs/wslc_filesystem.json
index d9c63abc7..d655fba6a 100644
--- a/tests/configs/wslc_filesystem.json
+++ b/tests/configs/wslc_filesystem.json
@@ -3,11 +3,11 @@
   "containerId": "wslc-filesystem-test",
   "containment": "wslc",
   "process": {
-    "commandLine": "set -e; ls -la /mnt/c/workspace >/dev/null && echo 'PASS: filesystem mount visible' || { echo 'FAIL: /mnt/c/workspace not visible'; exit 1; }; cpus=$(nproc); echo \"CPU_COUNT=$cpus\"; [ \"$cpus\" = \"2\" ] && echo 'PASS: cpuCount enforced (nproc=2)' || { echo \"FAIL: expected nproc=2, got $cpus\"; exit 1; }; mem_kb=$(awk '/MemTotal:/ {print $2}' /proc/meminfo); mem_mb=$((mem_kb/1024)); echo \"MEM_TOTAL_MB=$mem_mb\"; [ $mem_mb -ge 820 ] && [ $mem_mb -le 1075 ] && echo 'PASS: memoryMb enforced (~1024MB, kernel-visible 80-105%)' || { echo \"FAIL: expected 820-1075MB, got ${mem_mb}MB\"; exit 1; }",
-    "cwd": "C:\\workspace"
+    "commandLine": "set -e; ls -la /mnt/c/wslcfs >/dev/null && echo 'PASS: filesystem mount visible' || { echo 'FAIL: /mnt/c/wslcfs not visible'; exit 1; }; cpus=$(nproc); echo \"CPU_COUNT=$cpus\"; [ \"$cpus\" = \"2\" ] && echo 'PASS: cpuCount enforced (nproc=2)' || { echo \"FAIL: expected nproc=2, got $cpus\"; exit 1; }; mem_kb=$(awk '/MemTotal:/ {print $2}' /proc/meminfo); mem_mb=$((mem_kb/1024)); echo \"MEM_TOTAL_MB=$mem_mb\"; [ $mem_mb -ge 820 ] && [ $mem_mb -le 1075 ] && echo 'PASS: memoryMb enforced (~1024MB, kernel-visible 80-105%)' || { echo \"FAIL: expected 820-1075MB, got ${mem_mb}MB\"; exit 1; }",
+    "cwd": "C:\\wslcfs"
   },
   "filesystem": {
-    "readwritePaths": ["C:\\workspace"]
+    "readwritePaths": ["C:\\wslcfs"]
   },
   "network": {
     "defaultPolicy": "allow"
diff --git a/tests/configs/wslc_network_proxy.json b/tests/configs/wslc_network_proxy.json
index 8556b438e..a96793909 100644
--- a/tests/configs/wslc_network_proxy.json
+++ b/tests/configs/wslc_network_proxy.json
@@ -3,8 +3,8 @@
   "containerId": "wslc-network-proxy",
   "containment": "wslc",
   "process": {
-    "commandLine": "set -e; ( while true; do printf 'HTTP/1.0 200 OK\\r\\nContent-Length: 9\\r\\nConnection: close\\r\\n\\r\\nPROXY_HIT' | nc -l -p 8888 -w 2 >/dev/null 2>&1; done ) & sleep 1; echo \"PROXY_ENV HTTP_PROXY=[$HTTP_PROXY] http_proxy=[$http_proxy] NO_PROXY=[$NO_PROXY] no_proxy=[$no_proxy]\"; BODY=$(wget -q -O - http://example.com/ 2>/dev/null || true); echo \"CLIENT_GOT=[$BODY]\"; case \"$BODY\" in *PROXY_HIT*) echo WSLC_PROXY_FUNCTIONAL_OK ;; *) echo WSLC_PROXY_FAIL ;; esac",
-    "env": ["HTTP_PROXY=http://attacker.invalid:1", "http_proxy=http://attacker.invalid:1", "NO_PROXY=*", "no_proxy=attacker.invalid"]
+    "commandLine": "set -e; ( while true; do printf 'HTTP/1.0 200 OK\\r\\nContent-Length: 9\\r\\nConnection: close\\r\\n\\r\\nPROXY_HIT' | nc -l -p 8888 -w 2 >/dev/null 2>&1; done ) & sleep 1; echo \"PROXY_ENV HTTP_PROXY=[$HTTP_PROXY] http_proxy=[$http_proxy] FTP_PROXY=[$FTP_PROXY] ftp_proxy=[$ftp_proxy] NO_PROXY=[$NO_PROXY] no_proxy=[$no_proxy]\"; BODY=$(wget -q -O - http://example.com/ 2>/dev/null || true); echo \"CLIENT_GOT=[$BODY]\"; case \"$BODY\" in *PROXY_HIT*) echo WSLC_PROXY_FUNCTIONAL_OK ;; *) echo WSLC_PROXY_FAIL ;; esac",
+    "env": ["HTTP_PROXY=http://attacker.invalid:1", "http_proxy=http://attacker.invalid:1", "FTP_PROXY=http://attacker.invalid:1", "ftp_proxy=http://attacker.invalid:1", "NO_PROXY=*", "no_proxy=attacker.invalid"]
   },
   "network": {
     "defaultPolicy": "allow",
diff --git a/tests/configs/wslc_readonly_mount.json b/tests/configs/wslc_readonly_mount.json
index 6a069d0ac..5ad6d429e 100644
--- a/tests/configs/wslc_readonly_mount.json
+++ b/tests/configs/wslc_readonly_mount.json
@@ -3,10 +3,10 @@
   "containerId": "wslc-readonly-mount",
   "containment": "wslc",
   "process": {
-    "commandLine": "cat /mnt/c/workspace/test.txt && echo 'Read succeeded' && echo 'write test' > /mnt/c/workspace/readonly_write_test.txt && echo 'Write succeeded (unexpected)' || echo 'Write blocked (expected for readonly)'"
+    "commandLine": "cat /mnt/c/wslcro/test.txt && echo 'Read succeeded' && echo 'write test' > /mnt/c/wslcro/readonly_write_test.txt && echo 'Write succeeded (unexpected)' || echo 'Write blocked (expected for readonly)'"
   },
   "filesystem": {
-    "readonlyPaths": ["C:\\workspace"]
+    "readonlyPaths": ["C:\\wslcro"]
   },
   "network": {
     "defaultPolicy": "block"
diff --git a/tests/scripts/run_wslc_all_tests.ps1 b/tests/scripts/run_wslc_all_tests.ps1
index 9c2a6cb49..4e4958f50 100644
--- a/tests/scripts/run_wslc_all_tests.ps1
+++ b/tests/scripts/run_wslc_all_tests.ps1
@@ -215,10 +215,39 @@ $null = $results.Add((Run-WslcTest "wslc_stderr.json" -OutputContains "stdout me
 $null = $results.Add((Run-WslcTest "wslc_large_output.json"))
 
 Write-Host "`n--- Filesystem Tests ---" -ForegroundColor Cyan
-# wslc_filesystem.json also asserts cpuCount + memoryMb enforcement via nproc and /proc/meminfo.
-$null = $results.Add((Run-WslcTest "wslc_filesystem.json" `
-    -OutputMatches "(?s)PASS: filesystem mount visible.*PASS: cpuCount enforced.*PASS: memoryMb enforced"))
-$null = $results.Add((Run-WslcTest "wslc_readonly_mount.json" -OutputContains "Read succeeded"))
+
+# Fixed paths must match tests\configs\wslc_filesystem.json and
+# tests\configs\wslc_readonly_mount.json.
+$fsFixtureDir = "C:\wslcfs"
+$readonlyFixtureDir = "C:\wslcro"
+$readonlyFixture = Join-Path $readonlyFixtureDir "test.txt"
+
+function Remove-FilesystemFixtures {
+    Remove-Item -Recurse -Force $fsFixtureDir -ErrorAction SilentlyContinue
+    Remove-Item -Recurse -Force $readonlyFixtureDir -ErrorAction SilentlyContinue
+}
+
+# Both filesystem configs mount a host directory the suite owns outright, so a
+# run needs nothing hand-made and never touches C:\workspace, where the
+# prerequisites above tell the developer to keep alpine.tar.  wslc_filesystem
+# only needs its mount target to exist; wslc_readonly_mount also reads
+# test.txt, seeded the way the LXC and bubblewrap suites seed theirs
+# (run_lxc_filesystem_test.sh:21, run_bwrap_filesystem_test.sh:25).  The
+# finally removes both roots, including the probe file a wrongly-writable
+# mount would leave behind.
+Remove-FilesystemFixtures
+try {
+    $null = New-Item -ItemType Directory -Path $fsFixtureDir -Force
+    $null = New-Item -ItemType Directory -Path $readonlyFixtureDir -Force
+    Set-Content -Path $readonlyFixture -Value "test content" -Encoding ascii
+
+    # wslc_filesystem.json also asserts cpuCount + memoryMb enforcement via nproc and /proc/meminfo.
+    $null = $results.Add((Run-WslcTest "wslc_filesystem.json" `
+        -OutputMatches "(?s)PASS: filesystem mount visible.*PASS: cpuCount enforced.*PASS: memoryMb enforced"))
+    $null = $results.Add((Run-WslcTest "wslc_readonly_mount.json" -OutputContains "Read succeeded"))
+} finally {
+    Remove-FilesystemFixtures
+}
 
 Write-Host "`n--- Object Validation Tests ---" -ForegroundColor Cyan
 # Object-based validation (roadmap D6): a directory under readwritePaths and a
diff --git a/tests/scripts/run_wslc_proxy_test.ps1 b/tests/scripts/run_wslc_proxy_test.ps1
index d8f6ff302..9da6300c0 100644
--- a/tests/scripts/run_wslc_proxy_test.ps1
+++ b/tests/scripts/run_wslc_proxy_test.ps1
@@ -96,6 +96,15 @@ if ($pass -and ($childLine -match 'attacker\.invalid')) {
     $reason = "caller-supplied proxy env var leaked to the child (attacker.invalid not scrubbed)"
 }
 
+# The FTP family is set to the proxy as well, so an image-baked ftp_proxy
+# cannot send FTP traffic somewhere the operator did not choose. Matched
+# case-sensitively: -notmatch would let the upper-case entry satisfy both
+# checks and leave the lower-case one untested.
+if ($pass -and (($childLine -cnotmatch 'FTP_PROXY=\[http://127\.0\.0\.1:8888\]') -or ($childLine -cnotmatch 'ftp_proxy=\[http://127\.0\.0\.1:8888\]'))) {
+    $pass = $false
+    $reason = "runner did not inject/scrub the FTP proxy family (expected http://127.0.0.1:8888)"
+}
+
 # NO_PROXY / no_proxy must be neutralized to empty so an image-baked or
 # caller-supplied exemption (e.g. NO_PROXY=*) cannot disable the proxy.
 if ($pass -and (($childLine -notmatch 'NO_PROXY=\[\]') -or ($childLine -notmatch 'no_proxy=\[\]'))) {