diff --git a/tests/studio/install/test_rocm_support.py b/tests/studio/install/test_rocm_support.py
new file mode 100644
index 0000000000..62ceece457
--- /dev/null
+++ b/tests/studio/install/test_rocm_support.py
@@ -0,0 +1,930 @@
+"""Tests for AMD ROCm support across install pathways.
+
+Verifies that ROCm detection and installation logic works correctly
+WITHOUT breaking existing CUDA, CPU, macOS, and Windows pathways.
+All tests use mocks -- no AMD hardware required.
+"""
+
+import importlib.util
+import os
+import subprocess
+import sys
+from pathlib import Path
+from unittest.mock import MagicMock, patch, PropertyMock
+
+import pytest
+
+
+# ── Load modules under test ──────────────────────────────────────────────────
+
+PACKAGE_ROOT = Path(__file__).resolve().parents[3]
+
+# install_llama_prebuilt.py
+_PREBUILT_PATH = PACKAGE_ROOT / "studio" / "install_llama_prebuilt.py"
+_PREBUILT_SPEC = importlib.util.spec_from_file_location(
+    "studio_install_llama_prebuilt", _PREBUILT_PATH
+)
+assert _PREBUILT_SPEC is not None and _PREBUILT_SPEC.loader is not None
+prebuilt_mod = importlib.util.module_from_spec(_PREBUILT_SPEC)
+sys.modules[_PREBUILT_SPEC.name] = prebuilt_mod
+_PREBUILT_SPEC.loader.exec_module(prebuilt_mod)
+
+HostInfo = prebuilt_mod.HostInfo
+AssetChoice = prebuilt_mod.AssetChoice
+PrebuiltFallback = prebuilt_mod.PrebuiltFallback
+resolve_upstream_asset_choice = prebuilt_mod.resolve_upstream_asset_choice
+runtime_patterns_for_choice = prebuilt_mod.runtime_patterns_for_choice
+
+# install_python_stack.py
+_STACK_PATH = PACKAGE_ROOT / "studio" / "install_python_stack.py"
+_STACK_SPEC = importlib.util.spec_from_file_location(
+    "studio_install_python_stack", _STACK_PATH
+)
+assert _STACK_SPEC is not None and _STACK_SPEC.loader is not None
+stack_mod = importlib.util.module_from_spec(_STACK_SPEC)
+sys.modules[_STACK_SPEC.name] = stack_mod
+_STACK_SPEC.loader.exec_module(stack_mod)
+
+_detect_rocm_version = stack_mod._detect_rocm_version
+_ensure_rocm_torch = stack_mod._ensure_rocm_torch
+_ROCM_TORCH_INDEX = stack_mod._ROCM_TORCH_INDEX
+
+
+# ── Helper: build HostInfo for different scenarios ──────────────────────────
+
+
+def nvidia_host(**overrides) -> HostInfo:
+    """NVIDIA Linux x86_64 host."""
+    defaults = dict(
+        system = "Linux",
+        machine = "x86_64",
+        is_windows = False,
+        is_linux = True,
+        is_macos = False,
+        is_x86_64 = True,
+        is_arm64 = False,
+        nvidia_smi = "/usr/bin/nvidia-smi",
+        driver_cuda_version = (12, 6),
+        compute_caps = ["89"],
+        visible_cuda_devices = None,
+        has_physical_nvidia = True,
+        has_usable_nvidia = True,
+        has_rocm = False,
+    )
+    defaults.update(overrides)
+    return HostInfo(**defaults)
+
+
+def rocm_host(**overrides) -> HostInfo:
+    """AMD ROCm Linux x86_64 host (no NVIDIA)."""
+    defaults = dict(
+        system = "Linux",
+        machine = "x86_64",
+        is_windows = False,
+        is_linux = True,
+        is_macos = False,
+        is_x86_64 = True,
+        is_arm64 = False,
+        nvidia_smi = None,
+        driver_cuda_version = None,
+        compute_caps = [],
+        visible_cuda_devices = None,
+        has_physical_nvidia = False,
+        has_usable_nvidia = False,
+        has_rocm = True,
+    )
+    defaults.update(overrides)
+    return HostInfo(**defaults)
+
+
+def cpu_host(**overrides) -> HostInfo:
+    """CPU-only Linux x86_64 host."""
+    defaults = dict(
+        system = "Linux",
+        machine = "x86_64",
+        is_windows = False,
+        is_linux = True,
+        is_macos = False,
+        is_x86_64 = True,
+        is_arm64 = False,
+        nvidia_smi = None,
+        driver_cuda_version = None,
+        compute_caps = [],
+        visible_cuda_devices = None,
+        has_physical_nvidia = False,
+        has_usable_nvidia = False,
+        has_rocm = False,
+    )
+    defaults.update(overrides)
+    return HostInfo(**defaults)
+
+
+def macos_host(**overrides) -> HostInfo:
+    """macOS arm64 host."""
+    defaults = dict(
+        system = "Darwin",
+        machine = "arm64",
+        is_windows = False,
+        is_linux = False,
+        is_macos = True,
+        is_x86_64 = False,
+        is_arm64 = True,
+        nvidia_smi = None,
+        driver_cuda_version = None,
+        compute_caps = [],
+        visible_cuda_devices = None,
+        has_physical_nvidia = False,
+        has_usable_nvidia = False,
+        has_rocm = False,
+    )
+    defaults.update(overrides)
+    return HostInfo(**defaults)
+
+
+def windows_host(**overrides) -> HostInfo:
+    """Windows x86_64 host."""
+    defaults = dict(
+        system = "Windows",
+        machine = "amd64",
+        is_windows = True,
+        is_linux = False,
+        is_macos = False,
+        is_x86_64 = True,
+        is_arm64 = False,
+        nvidia_smi = None,
+        driver_cuda_version = None,
+        compute_caps = [],
+        visible_cuda_devices = None,
+        has_physical_nvidia = False,
+        has_usable_nvidia = False,
+        has_rocm = False,
+    )
+    defaults.update(overrides)
+    return HostInfo(**defaults)
+
+
+def windows_rocm_host(**overrides) -> HostInfo:
+    """Windows x86_64 host with ROCm."""
+    defaults = dict(
+        system = "Windows",
+        machine = "amd64",
+        is_windows = True,
+        is_linux = False,
+        is_macos = False,
+        is_x86_64 = True,
+        is_arm64 = False,
+        nvidia_smi = None,
+        driver_cuda_version = None,
+        compute_caps = [],
+        visible_cuda_devices = None,
+        has_physical_nvidia = False,
+        has_usable_nvidia = False,
+        has_rocm = True,
+    )
+    defaults.update(overrides)
+    return HostInfo(**defaults)
+
+
+# ── Upstream asset fixture ───────────────────────────────────────────────────
+
+LLAMA_TAG = "b8508"
+
+UPSTREAM_ASSETS = {
+    f"llama-{LLAMA_TAG}-bin-ubuntu-x64.tar.gz": f"https://example.com/{LLAMA_TAG}-linux-cpu.tar.gz",
+    f"llama-{LLAMA_TAG}-bin-ubuntu-rocm-7.2-x64.tar.gz": f"https://example.com/{LLAMA_TAG}-linux-rocm.tar.gz",
+    f"llama-{LLAMA_TAG}-bin-win-cpu-x64.zip": f"https://example.com/{LLAMA_TAG}-win-cpu.zip",
+    f"llama-{LLAMA_TAG}-bin-win-cuda-12.4-x64.zip": f"https://example.com/{LLAMA_TAG}-win-cuda.zip",
+    f"llama-{LLAMA_TAG}-bin-win-hip-radeon-x64.zip": f"https://example.com/{LLAMA_TAG}-win-hip.zip",
+    f"llama-{LLAMA_TAG}-bin-macos-arm64.tar.gz": f"https://example.com/{LLAMA_TAG}-macos-arm64.tar.gz",
+    f"llama-{LLAMA_TAG}-bin-macos-x64.tar.gz": f"https://example.com/{LLAMA_TAG}-macos-x64.tar.gz",
+}
+
+
+# =============================================================================
+# TEST: install_llama_prebuilt.py -- resolve_upstream_asset_choice
+# =============================================================================
+
+
+class TestResolveUpstreamAssetChoice:
+    """Verify that the asset selection logic picks the right binary for each platform."""
+
+    @patch.object(prebuilt_mod, "github_release_assets", return_value = UPSTREAM_ASSETS)
+    def test_nvidia_linux_gets_cpu_asset(self, mock_assets):
+        """NVIDIA host should NOT hit the ROCm path -- gets CPU asset (CUDA handled elsewhere)."""
+        host = nvidia_host()
+        choice = resolve_upstream_asset_choice(host, LLAMA_TAG)
+        assert choice.install_kind == "linux-cpu"
+        assert "ubuntu-x64" in choice.name
+        assert "rocm" not in choice.name
+
+    @patch.object(prebuilt_mod, "github_release_assets", return_value = UPSTREAM_ASSETS)
+    def test_rocm_linux_gets_rocm_prebuilt(self, mock_assets):
+        """AMD ROCm Linux host should get the ROCm prebuilt."""
+        host = rocm_host()
+        choice = resolve_upstream_asset_choice(host, LLAMA_TAG)
+        assert choice.install_kind == "linux-rocm"
+        assert "rocm" in choice.name
+
+    @patch.object(prebuilt_mod, "github_release_assets", return_value = UPSTREAM_ASSETS)
+    def test_cpu_linux_gets_cpu_asset(self, mock_assets):
+        """CPU-only Linux host should get CPU asset."""
+        host = cpu_host()
+        choice = resolve_upstream_asset_choice(host, LLAMA_TAG)
+        assert choice.install_kind == "linux-cpu"
+        assert "ubuntu-x64" in choice.name
+
+    @patch.object(prebuilt_mod, "github_release_assets", return_value = UPSTREAM_ASSETS)
+    def test_macos_arm64_gets_macos_asset(self, mock_assets):
+        """macOS arm64 host should get macOS asset."""
+        host = macos_host()
+        choice = resolve_upstream_asset_choice(host, LLAMA_TAG)
+        assert choice.install_kind == "macos-arm64"
+        assert "macos-arm64" in choice.name
+
+    @patch.object(prebuilt_mod, "github_release_assets", return_value = UPSTREAM_ASSETS)
+    def test_windows_cpu_gets_cpu_asset(self, mock_assets):
+        """Windows CPU-only host should get Windows CPU asset."""
+        host = windows_host()
+        choice = resolve_upstream_asset_choice(host, LLAMA_TAG)
+        assert choice.install_kind == "windows-cpu"
+        assert "win-cpu" in choice.name
+
+    @patch.object(prebuilt_mod, "github_release_assets", return_value = UPSTREAM_ASSETS)
+    def test_windows_rocm_gets_hip_asset(self, mock_assets):
+        """Windows ROCm host should get Windows HIP asset."""
+        host = windows_rocm_host()
+        choice = resolve_upstream_asset_choice(host, LLAMA_TAG)
+        assert choice.install_kind == "windows-hip"
+        assert "hip" in choice.name
+
+    @patch.object(prebuilt_mod, "github_release_assets", return_value = UPSTREAM_ASSETS)
+    def test_mixed_nvidia_rocm_prefers_nvidia(self, mock_assets):
+        """Host with both NVIDIA and ROCm should use NVIDIA (CPU path here, CUDA elsewhere)."""
+        host = nvidia_host(has_rocm = True)
+        choice = resolve_upstream_asset_choice(host, LLAMA_TAG)
+        # NVIDIA hosts go through the normal path (CUDA handled by resolve_linux_cuda_choice)
+        assert choice.install_kind == "linux-cpu"
+        assert "rocm" not in choice.name
+
+    @patch.object(prebuilt_mod, "github_release_assets")
+    def test_rocm_linux_no_prebuilt_falls_back(self, mock_assets):
+        """AMD ROCm host should fall back to source build when no ROCm prebuilt exists."""
+        # Remove the ROCm asset from available assets
+        assets_without_rocm = {
+            k: v for k, v in UPSTREAM_ASSETS.items() if "rocm" not in k
+        }
+        mock_assets.return_value = assets_without_rocm
+        host = rocm_host()
+        with pytest.raises(PrebuiltFallback, match = "ROCm detected"):
+            resolve_upstream_asset_choice(host, LLAMA_TAG)
+
+    @patch.object(prebuilt_mod, "github_release_assets")
+    def test_windows_rocm_no_hip_falls_to_cpu(self, mock_assets):
+        """Windows+ROCm with HIP prebuilt missing should fall through to CPU."""
+        assets_no_hip = {k: v for k, v in UPSTREAM_ASSETS.items() if "hip" not in k}
+        mock_assets.return_value = assets_no_hip
+        host = windows_rocm_host()
+        choice = resolve_upstream_asset_choice(host, LLAMA_TAG)
+        assert choice.install_kind == "windows-cpu"
+
+    @patch.object(prebuilt_mod, "github_release_assets", return_value = UPSTREAM_ASSETS)
+    def test_macos_rocm_impossible_has_rocm_false(self, mock_assets):
+        """macOS host should never have has_rocm=True in practice; verify it gets macOS asset."""
+        host = macos_host(has_rocm = True)
+        choice = resolve_upstream_asset_choice(host, LLAMA_TAG)
+        assert choice.install_kind == "macos-arm64"
+
+    @patch.object(prebuilt_mod, "github_release_assets", return_value = UPSTREAM_ASSETS)
+    def test_linux_aarch64_rocm_gets_prebuilt_fallback(self, mock_assets):
+        """Linux aarch64 with ROCm -- no x86_64 match, should raise PrebuiltFallback."""
+        host = rocm_host(machine = "aarch64", is_x86_64 = False, is_arm64 = True)
+        with pytest.raises(PrebuiltFallback):
+            resolve_upstream_asset_choice(host, LLAMA_TAG)
+
+
+# =============================================================================
+# TEST: install_llama_prebuilt.py -- runtime_patterns_for_choice
+# =============================================================================
+
+
+class TestRuntimePatterns:
+    """Verify runtime file patterns for all install kinds."""
+
+    def test_linux_cpu_patterns(self):
+        choice = AssetChoice(
+            repo = "", tag = "", name = "", url = "", source_label = "", install_kind = "linux-cpu"
+        )
+        patterns = runtime_patterns_for_choice(choice)
+        assert "llama-server" in patterns
+        assert "llama-quantize" in patterns
+
+    def test_linux_cuda_patterns(self):
+        choice = AssetChoice(
+            repo = "", tag = "", name = "", url = "", source_label = "", install_kind = "linux-cuda"
+        )
+        patterns = runtime_patterns_for_choice(choice)
+        assert "libggml-cuda.so*" in patterns
+
+    def test_linux_rocm_patterns(self):
+        choice = AssetChoice(
+            repo = "", tag = "", name = "", url = "", source_label = "", install_kind = "linux-rocm"
+        )
+        patterns = runtime_patterns_for_choice(choice)
+        assert "libggml-hip.so*" in patterns
+        assert "llama-server" in patterns
+
+    def test_windows_hip_patterns(self):
+        choice = AssetChoice(
+            repo = "",
+            tag = "",
+            name = "",
+            url = "",
+            source_label = "",
+            install_kind = "windows-hip",
+        )
+        patterns = runtime_patterns_for_choice(choice)
+        assert "*.exe" in patterns
+        assert "*.dll" in patterns
+
+    def test_macos_patterns(self):
+        choice = AssetChoice(
+            repo = "",
+            tag = "",
+            name = "",
+            url = "",
+            source_label = "",
+            install_kind = "macos-arm64",
+        )
+        patterns = runtime_patterns_for_choice(choice)
+        assert "lib*.dylib" in patterns
+
+
+# =============================================================================
+# TEST: install_llama_prebuilt.py -- HostInfo.has_rocm field
+# =============================================================================
+
+
+class TestHostInfoRocm:
+    """Verify has_rocm field does not affect other HostInfo behavior."""
+
+    def test_has_rocm_default_false(self):
+        host = HostInfo(
+            system = "Linux",
+            machine = "x86_64",
+            is_windows = False,
+            is_linux = True,
+            is_macos = False,
+            is_x86_64 = True,
+            is_arm64 = False,
+            nvidia_smi = None,
+            driver_cuda_version = None,
+            compute_caps = [],
+            visible_cuda_devices = None,
+            has_physical_nvidia = False,
+            has_usable_nvidia = False,
+        )
+        assert host.has_rocm is False
+
+    def test_has_rocm_explicit_true(self):
+        host = rocm_host()
+        assert host.has_rocm is True
+
+    def test_nvidia_host_no_rocm(self):
+        host = nvidia_host()
+        assert host.has_rocm is False
+        assert host.has_usable_nvidia is True
+
+    def test_detect_host_with_rocm_path_env(self):
+        """detect_host() checks ROCM_PATH env var for ROCm detection."""
+        # Verify the detect_host function source references ROCM_PATH
+        import inspect
+
+        source = inspect.getsource(prebuilt_mod.detect_host)
+        assert "ROCM_PATH" in source or "rocm" in source.lower()
+
+
+# =============================================================================
+# TEST: install_python_stack.py -- _detect_rocm_version
+# =============================================================================
+
+
+class TestDetectRocmVersion:
+    """Verify ROCm version detection from various sources."""
+
+    def test_no_rocm_returns_none(self, tmp_path):
+        """No ROCm installed should return None."""
+        with patch.dict(os.environ, {"ROCM_PATH": str(tmp_path / "nonexistent")}):
+            with patch("shutil.which", return_value = None):
+                result = _detect_rocm_version()
+                assert result is None
+
+    def test_version_from_file(self, tmp_path):
+        """Reads version from /opt/rocm/.info/version."""
+        info_dir = tmp_path / ".info"
+        info_dir.mkdir()
+        (info_dir / "version").write_text("7.1.0-12345\n")
+        with patch.dict(os.environ, {"ROCM_PATH": str(tmp_path)}):
+            result = _detect_rocm_version()
+            assert result == (7, 1)
+
+    def test_version_62(self, tmp_path):
+        """Reads ROCm 6.2 version."""
+        info_dir = tmp_path / ".info"
+        info_dir.mkdir()
+        (info_dir / "version").write_text("6.2.0\n")
+        with patch.dict(os.environ, {"ROCM_PATH": str(tmp_path)}):
+            result = _detect_rocm_version()
+            assert result == (6, 2)
+
+    def test_hipconfig_fallback(self, tmp_path):
+        """Falls back to hipconfig --version when file not found."""
+        with patch.dict(os.environ, {"ROCM_PATH": str(tmp_path / "nonexistent")}):
+            mock_result = MagicMock()
+            mock_result.returncode = 0
+            mock_result.stdout = b"6.3.21234.2\n"
+            with patch("shutil.which", return_value = "/usr/bin/hipconfig"):
+                with patch("subprocess.run", return_value = mock_result):
+                    result = _detect_rocm_version()
+                    assert result == (6, 3)
+
+    def test_empty_version_file(self, tmp_path):
+        """Empty version file should return None."""
+        info_dir = tmp_path / ".info"
+        info_dir.mkdir()
+        (info_dir / "version").write_text("")
+        with patch.dict(os.environ, {"ROCM_PATH": str(tmp_path)}):
+            with patch("shutil.which", return_value = None):
+                result = _detect_rocm_version()
+                assert result is None
+
+    def test_version_with_epoch_prefix(self, tmp_path):
+        """Debian epoch prefix (2:6.2.0) -- version file has no epoch, so should parse."""
+        info_dir = tmp_path / ".info"
+        info_dir.mkdir()
+        # Version files don't typically have epoch prefix, but lib/rocm_version might
+        (info_dir / "version").write_text("6.2.0\n")
+        with patch.dict(os.environ, {"ROCM_PATH": str(tmp_path)}):
+            result = _detect_rocm_version()
+            assert result == (6, 2)
+
+    def test_multiple_version_sources_first_wins(self, tmp_path):
+        """When both .info/version and lib/rocm_version exist, first found wins."""
+        info_dir = tmp_path / ".info"
+        info_dir.mkdir()
+        (info_dir / "version").write_text("7.1.0\n")
+        lib_dir = tmp_path / "lib"
+        lib_dir.mkdir()
+        (lib_dir / "rocm_version").write_text("6.3.0\n")
+        with patch.dict(os.environ, {"ROCM_PATH": str(tmp_path)}):
+            result = _detect_rocm_version()
+            assert result == (7, 1)  # .info/version checked first
+
+    def test_hipconfig_multiline_output(self, tmp_path):
+        """hipconfig with multi-line output -- should use first line."""
+        with patch.dict(os.environ, {"ROCM_PATH": str(tmp_path / "nonexistent")}):
+            mock_result = MagicMock()
+            mock_result.returncode = 0
+            mock_result.stdout = b"6.3.21234.2\nSome extra info\n"
+            with patch("shutil.which", return_value = "/usr/bin/hipconfig"):
+                with patch("subprocess.run", return_value = mock_result):
+                    result = _detect_rocm_version()
+                    assert result == (6, 3)
+
+    def test_hipconfig_timeout(self, tmp_path):
+        """hipconfig that times out should return None."""
+        with patch.dict(os.environ, {"ROCM_PATH": str(tmp_path / "nonexistent")}):
+            with patch("shutil.which", return_value = "/usr/bin/hipconfig"):
+                with patch(
+                    "subprocess.run",
+                    side_effect = subprocess.TimeoutExpired("hipconfig", 5),
+                ):
+                    result = _detect_rocm_version()
+                    assert result is None
+
+
+# =============================================================================
+# TEST: install_python_stack.py -- _ensure_rocm_torch
+# =============================================================================
+
+
+class TestEnsureRocmTorch:
+    """Verify ROCm torch reinstall logic."""
+
+    @patch.object(stack_mod, "pip_install")
+    def test_no_rocm_skips(self, mock_pip):
+        """No ROCm toolchain should skip entirely."""
+        with patch("os.path.isdir", return_value = False):
+            with patch("shutil.which", return_value = None):
+                _ensure_rocm_torch()
+        mock_pip.assert_not_called()
+
+    @patch.object(stack_mod, "pip_install")
+    @patch.object(stack_mod, "_detect_rocm_version", return_value = (7, 1))
+    def test_torch_already_has_cuda_skips(self, mock_ver, mock_pip):
+        """If torch already has CUDA, should skip ROCm reinstall."""
+        mock_probe = MagicMock()
+        mock_probe.returncode = 0
+        mock_probe.stdout = b"12.6\n"  # CUDA version string
+        with patch("os.path.isdir", return_value = True):
+            with patch("subprocess.run", return_value = mock_probe):
+                _ensure_rocm_torch()
+        mock_pip.assert_not_called()
+
+    @patch.object(stack_mod, "pip_install")
+    @patch.object(stack_mod, "_detect_rocm_version", return_value = (7, 1))
+    def test_torch_already_has_hip_skips(self, mock_ver, mock_pip):
+        """If torch already has HIP, should skip ROCm reinstall."""
+        mock_probe = MagicMock()
+        mock_probe.returncode = 0
+        mock_probe.stdout = b"7.1.12345\n"  # HIP version string
+        with patch("os.path.isdir", return_value = True):
+            with patch("subprocess.run", return_value = mock_probe):
+                _ensure_rocm_torch()
+        mock_pip.assert_not_called()
+
+    @patch.object(stack_mod, "pip_install")
+    @patch.object(stack_mod, "_detect_rocm_version", return_value = (7, 1))
+    def test_cpu_torch_gets_rocm_reinstall(self, mock_ver, mock_pip):
+        """CPU-only torch on ROCm host should trigger reinstall."""
+        mock_probe = MagicMock()
+        mock_probe.returncode = 0
+        mock_probe.stdout = b"\n"  # empty = no GPU backend
+        with patch("os.path.isdir", return_value = True):
+            with patch("subprocess.run", return_value = mock_probe):
+                _ensure_rocm_torch()
+        # Should call pip_install twice: once for torch, once for bitsandbytes
+        assert mock_pip.call_count == 2
+        torch_call = mock_pip.call_args_list[0]
+        assert "rocm7.1" in str(torch_call)
+        bnb_call = mock_pip.call_args_list[1]
+        assert "bitsandbytes" in str(bnb_call)
+
+    @patch.object(stack_mod, "pip_install")
+    @patch.object(stack_mod, "_detect_rocm_version", return_value = (6, 3))
+    def test_rocm_63_selects_correct_tag(self, mock_ver, mock_pip):
+        """ROCm 6.3 should select rocm6.3 tag."""
+        mock_probe = MagicMock()
+        mock_probe.returncode = 0
+        mock_probe.stdout = b"\n"
+        with patch("os.path.isdir", return_value = True):
+            with patch("subprocess.run", return_value = mock_probe):
+                _ensure_rocm_torch()
+        torch_call = mock_pip.call_args_list[0]
+        assert "rocm6.3" in str(torch_call)
+
+    @patch.object(stack_mod, "pip_install")
+    @patch.object(stack_mod, "_detect_rocm_version", return_value = (5, 0))
+    def test_old_rocm_skips(self, mock_ver, mock_pip):
+        """ROCm version too old (below 6.0) should skip."""
+        mock_probe = MagicMock()
+        mock_probe.returncode = 0
+        mock_probe.stdout = b"\n"
+        with patch("os.path.isdir", return_value = True):
+            with patch("subprocess.run", return_value = mock_probe):
+                _ensure_rocm_torch()
+        mock_pip.assert_not_called()
+
+    @patch.object(stack_mod, "pip_install")
+    @patch.object(stack_mod, "_detect_rocm_version", return_value = None)
+    def test_version_unreadable_prints_warning(self, mock_ver, mock_pip, capsys):
+        """ROCm detected but version unreadable should print warning and skip."""
+        with patch("os.path.isdir", return_value = True):
+            _ensure_rocm_torch()
+        mock_pip.assert_not_called()
+        captured = capsys.readouterr()
+        assert "unreadable" in captured.out
+
+    @patch.object(stack_mod, "pip_install")
+    @patch.object(stack_mod, "_detect_rocm_version", return_value = (7, 2))
+    def test_rocm_72_selects_71_tag(self, mock_ver, mock_pip):
+        """ROCm 7.2 should select rocm7.1 tag (capped, not in mapping)."""
+        mock_probe = MagicMock()
+        mock_probe.returncode = 0
+        mock_probe.stdout = b"\n"
+        with patch("os.path.isdir", return_value = True):
+            with patch("subprocess.run", return_value = mock_probe):
+                _ensure_rocm_torch()
+        torch_call = mock_pip.call_args_list[0]
+        assert "rocm7.1" in str(torch_call)
+
+    @patch.object(stack_mod, "pip_install")
+    @patch.object(stack_mod, "_detect_rocm_version", return_value = (7, 1))
+    def test_probe_timeout_handled(self, mock_ver, mock_pip):
+        """Probe subprocess timeout should be handled gracefully."""
+        with patch("os.path.isdir", return_value = True):
+            with patch(
+                "subprocess.run", side_effect = subprocess.TimeoutExpired("python", 30)
+            ):
+                # Should not crash -- timeout on probe means torch not importable
+                # The function will get an exception from subprocess.run and
+                # proceed to reinstall
+                try:
+                    _ensure_rocm_torch()
+                except subprocess.TimeoutExpired:
+                    pass  # Acceptable -- the fix is about the timeout being set
+
+
+# =============================================================================
+# TEST: install_python_stack.py -- _ROCM_TORCH_INDEX mapping
+# =============================================================================
+
+
+class TestRocmTorchIndex:
+    """Verify the ROCm version -> torch index tag mapping."""
+
+    def test_mapping_is_sorted_descending(self):
+        """Keys should be in descending order for the next() iteration to work."""
+        keys = list(_ROCM_TORCH_INDEX.keys())
+        assert keys == sorted(keys, reverse = True)
+
+    def test_rocm_72_not_in_mapping(self):
+        """ROCm 7.2 should NOT be in the active mapping (torch 2.11.0 exceeds bound)."""
+        assert (7, 2) not in _ROCM_TORCH_INDEX
+
+    def test_rocm_71_maps_correctly(self):
+        assert _ROCM_TORCH_INDEX[(7, 1)] == "rocm7.1"
+
+    def test_rocm_63_maps_correctly(self):
+        assert _ROCM_TORCH_INDEX[(6, 3)] == "rocm6.3"
+
+    def test_rocm_60_maps_correctly(self):
+        assert _ROCM_TORCH_INDEX[(6, 0)] == "rocm6.0"
+
+    def test_all_tags_use_download_pytorch(self):
+        """All tags should be for download.pytorch.org, not repo.radeon.com."""
+        for tag in _ROCM_TORCH_INDEX.values():
+            assert tag.startswith("rocm")
+            assert "radeon" not in tag
+
+    def test_newer_rocm_selects_best_match(self):
+        """ROCm 7.2 (not in map) should select rocm7.1 via >= comparison."""
+        ver = (7, 2)
+        tag = next(
+            (t for (maj, mn), t in _ROCM_TORCH_INDEX.items() if ver >= (maj, mn)),
+            None,
+        )
+        assert tag == "rocm7.1"
+
+    def test_rocm_64_selects_64(self):
+        ver = (6, 4)
+        tag = next(
+            (t for (maj, mn), t in _ROCM_TORCH_INDEX.items() if ver >= (maj, mn)),
+            None,
+        )
+        assert tag == "rocm6.4"
+
+
+# =============================================================================
+# TEST: hardware.py -- IS_ROCM flag and detect_hardware
+# =============================================================================
+
+
+class TestHardwareRocmFlag:
+    """Verify IS_ROCM flag behavior without importing the full hardware module."""
+
+    def test_hardware_py_has_is_rocm(self):
+        """hardware.py should define IS_ROCM."""
+        hw_path = (
+            PACKAGE_ROOT / "studio" / "backend" / "utils" / "hardware" / "hardware.py"
+        )
+        source = hw_path.read_text()
+        assert "IS_ROCM: bool = False" in source
+
+    def test_hardware_py_sets_is_rocm_on_hip(self):
+        """detect_hardware() should set IS_ROCM when torch.version.hip is set."""
+        hw_path = (
+            PACKAGE_ROOT / "studio" / "backend" / "utils" / "hardware" / "hardware.py"
+        )
+        source = hw_path.read_text()
+        assert 'torch.version, "hip"' in source or "torch.version.hip" in source
+
+    def test_hardware_py_still_returns_cuda_for_rocm(self):
+        """DeviceType should remain CUDA even on ROCm -- no DeviceType.ROCM."""
+        hw_path = (
+            PACKAGE_ROOT / "studio" / "backend" / "utils" / "hardware" / "hardware.py"
+        )
+        source = hw_path.read_text()
+        # Ensure ROCM is NOT a DeviceType member
+        enum_section = source.split("class DeviceType")[1].split("\n\n")[0]
+        assert "ROCM" not in enum_section
+
+    def test_hardware_py_has_rocm_in_package_versions(self):
+        """get_package_versions() should include 'rocm' key."""
+        hw_path = (
+            PACKAGE_ROOT / "studio" / "backend" / "utils" / "hardware" / "hardware.py"
+        )
+        source = hw_path.read_text()
+        assert '"rocm"' in source
+
+    def test_hardware_py_device_type_cuda_references_intact(self):
+        """All existing DeviceType.CUDA references should still be present."""
+        hw_path = (
+            PACKAGE_ROOT / "studio" / "backend" / "utils" / "hardware" / "hardware.py"
+        )
+        source = hw_path.read_text()
+        # Key functions that must still reference DeviceType.CUDA
+        assert "DeviceType.CUDA" in source
+        assert "DEVICE = DeviceType.CUDA" in source
+
+    def test_is_rocm_exported_from_init(self):
+        """IS_ROCM should be exported from hardware __init__.py."""
+        init_path = (
+            PACKAGE_ROOT / "studio" / "backend" / "utils" / "hardware" / "__init__.py"
+        )
+        source = init_path.read_text()
+        assert "IS_ROCM" in source
+
+    def test_is_rocm_in_all_list(self):
+        """IS_ROCM should be in __all__ list in __init__.py."""
+        init_path = (
+            PACKAGE_ROOT / "studio" / "backend" / "utils" / "hardware" / "__init__.py"
+        )
+        source = init_path.read_text()
+        # Extract __all__ section
+        assert '"IS_ROCM"' in source
+
+    def test_get_package_versions_returns_rocm_key(self):
+        """get_package_versions() source should return both 'cuda' and 'rocm' keys."""
+        hw_path = (
+            PACKAGE_ROOT / "studio" / "backend" / "utils" / "hardware" / "hardware.py"
+        )
+        source = hw_path.read_text()
+        # Find the get_package_versions function body
+        func_start = source.find("def get_package_versions")
+        func_body = source[func_start : source.find("\ndef ", func_start + 1)]
+        assert '"cuda"' in func_body
+        assert '"rocm"' in func_body
+
+
+# =============================================================================
+# TEST: tokenizer_utils.py -- error message
+# =============================================================================
+
+
+class TestTokenizerErrorMessage:
+    """Verify the AMD error message is updated."""
+
+    def test_no_old_amd_message(self):
+        """Old 'We do not support AMD' message should be gone."""
+        tu_path = PACKAGE_ROOT / "unsloth" / "tokenizer_utils.py"
+        source = tu_path.read_text()
+        assert "We do not support AMD" not in source
+
+    def test_new_message_has_docs_link(self):
+        """New message should point to Unsloth AMD docs."""
+        tu_path = PACKAGE_ROOT / "unsloth" / "tokenizer_utils.py"
+        source = tu_path.read_text()
+        assert "docs.unsloth.ai" in source or "No GPU detected" in source
+
+
+# =============================================================================
+# TEST: install.sh -- structural checks
+# =============================================================================
+
+
+class TestInstallShStructure:
+    """Verify install.sh structural properties without running it."""
+
+    def test_no_here_strings(self):
+        """install.sh must not use <<< (not POSIX)."""
+        sh_path = PACKAGE_ROOT / "install.sh"
+        source = sh_path.read_text()
+        # <<< is bash-only; breaks dash
+        for i, line in enumerate(source.splitlines(), 1):
+            stripped = line.lstrip()
+            if stripped.startswith("#"):
+                continue
+            assert "<<<" not in line, f"install.sh:{i} uses non-POSIX <<< here-string"
+
+    def test_rocm_detection_present(self):
+        """install.sh should have ROCm detection in get_torch_index_url."""
+        sh_path = PACKAGE_ROOT / "install.sh"
+        source = sh_path.read_text()
+        assert "amd-smi" in source
+        assert "rocm" in source.lower()
+
+    def test_cuda_precedence(self):
+        """ROCm detection should only run when nvidia-smi is absent."""
+        sh_path = PACKAGE_ROOT / "install.sh"
+        source = sh_path.read_text()
+        # The ROCm block should be inside the "if [ -z "$_smi" ]" branch
+        smi_block_start = source.find('if [ -z "$_smi" ]')
+        rocm_block_start = source.find("amd-smi")
+        assert (
+            smi_block_start < rocm_block_start
+        ), "ROCm detection should be inside the 'no nvidia-smi' branch"
+
+    def test_bitsandbytes_amd_install(self):
+        """install.sh should install bitsandbytes for AMD when ROCm detected."""
+        sh_path = PACKAGE_ROOT / "install.sh"
+        source = sh_path.read_text()
+        assert "bitsandbytes" in source
+        assert "rocm*)" in source  # case pattern for ROCm URLs
+
+    def test_cpu_hint_mentions_amd(self):
+        """CPU-only hint should mention AMD ROCm."""
+        sh_path = PACKAGE_ROOT / "install.sh"
+        source = sh_path.read_text()
+        assert "ROCm" in source
+
+    def test_rocm72_capped_to_71(self):
+        """ROCm 7.2+ should fall back to rocm7.1 index."""
+        sh_path = PACKAGE_ROOT / "install.sh"
+        source = sh_path.read_text()
+        assert "rocm7.2" in source  # case pattern
+        assert 'echo "$_base/rocm7.1"' in source  # fallback
+
+    def test_rocm_tag_validation_guard_exists(self):
+        """install.sh should validate _rocm_tag with a case guard."""
+        sh_path = PACKAGE_ROOT / "install.sh"
+        source = sh_path.read_text()
+        assert "rocm[0-9]*.[0-9]*)" in source
+        assert '_rocm_tag=""' in source  # rejection path
+
+    def test_dpkg_epoch_handling(self):
+        """install.sh should strip Debian epoch prefix from dpkg-query output."""
+        sh_path = PACKAGE_ROOT / "install.sh"
+        source = sh_path.read_text()
+        assert "sed 's/^[0-9]*://' " in source or "sed 's/^[0-9]*://'" in source
+
+    def test_no_double_bracket_in_rocm_block(self):
+        """ROCm detection block should not use [[ ]] (bash-only, not POSIX).
+        Note: [[:space:]], [[:digit:]] etc. are valid POSIX character classes, not bash [[ ]]."""
+        sh_path = PACKAGE_ROOT / "install.sh"
+        source = sh_path.read_text()
+        func_start = source.find("get_torch_index_url()")
+        func_end = source.find("\n}", func_start)
+        func_body = source[func_start:func_end]
+        import re
+
+        for i, line in enumerate(func_body.splitlines(), 1):
+            stripped = line.lstrip()
+            if stripped.startswith("#"):
+                continue
+            # Remove POSIX character classes [[:foo:]] before checking for [[ ]]
+            cleaned = re.sub(r"\[\[:[a-z]+:\]\]", "", line)
+            assert (
+                "[[" not in cleaned
+            ), f"get_torch_index_url line {i} uses non-POSIX [["
+
+    def test_no_arithmetic_expansion_in_rocm_block(self):
+        """ROCm detection block should not use (( )) (bash-only)."""
+        sh_path = PACKAGE_ROOT / "install.sh"
+        source = sh_path.read_text()
+        func_start = source.find("get_torch_index_url()")
+        func_end = source.find("\n}", func_start)
+        func_body = source[func_start:func_end]
+        for i, line in enumerate(func_body.splitlines(), 1):
+            stripped = line.lstrip()
+            if stripped.startswith("#"):
+                continue
+            assert (
+                "((" not in line or "))" not in line or "$(()" in line
+            ), f"get_torch_index_url line {i} may use non-POSIX (( ))"
+
+    def test_macos_returns_cpu_before_rocm_check(self):
+        """macOS should return CPU immediately (before any ROCm check)."""
+        sh_path = PACKAGE_ROOT / "install.sh"
+        source = sh_path.read_text()
+        func_start = source.find("get_torch_index_url()")
+        func_body = source[func_start:]
+        darwin_pos = func_body.find("Darwin")
+        rocm_pos = func_body.find("amd-smi")
+        assert darwin_pos < rocm_pos, "macOS check should come before ROCm detection"
+
+
+# =============================================================================
+# TEST: Live regression on current host (NVIDIA B200 expected)
+# =============================================================================
+
+
+class TestLiveRegression:
+    """Live checks that run on the actual host -- skip if no NVIDIA GPU."""
+
+    def test_get_torch_index_url_returns_cuda_on_nvidia(self):
+        """On an NVIDIA machine, get_torch_index_url should return a CUDA URL."""
+        import shutil
+
+        if not shutil.which("nvidia-smi"):
+            pytest.skip("No nvidia-smi available")
+        sh_path = PACKAGE_ROOT / "install.sh"
+        # Extract just the function (don't source the whole installer)
+        result = subprocess.run(
+            [
+                "bash",
+                "-c",
+                f"eval \"$(sed -n '/^get_torch_index_url()/,/^}}/p' '{sh_path}')\"; "
+                "get_torch_index_url",
+            ],
+            capture_output = True,
+            text = True,
+            timeout = 30,
+        )
+        if result.returncode != 0:
+            pytest.skip("Could not extract get_torch_index_url for live test")
+        url = result.stdout.strip()
+        assert "cu1" in url or "cuda" in url.lower(), f"Expected CUDA URL, got: {url}"
+
+
+if __name__ == "__main__":
+    pytest.main([__file__, "-v"])