diff --git a/src/test/java/com/google/devtools/build/lib/analysis/mock/BazelAnalysisMock.java b/src/test/java/com/google/devtools/build/lib/analysis/mock/BazelAnalysisMock.java
index 022066a..de5643e 100644
--- a/src/test/java/com/google/devtools/build/lib/analysis/mock/BazelAnalysisMock.java
+++ b/src/test/java/com/google/devtools/build/lib/analysis/mock/BazelAnalysisMock.java
@@ -67,18 +67,20 @@
 
   @Override
   public List<String> getWorkspaceContents(MockToolsConfig config) {
-    String bazelToolWorkspace = config.getPath("/bazel_tools_workspace").getPathString();
-    String bazelPlatformsWorkspace = config.getPath("/platforms").getPathString();
-    String rulesJavaWorkspace = config.getPath("/rules_java_workspace").getPathString();
+    String xcodeWorkspace = config.getPath("local_config_xcode_workspace").getPathString();
+    String protobufWorkspace = config.getPath("protobuf_workspace").getPathString();
+    String bazelToolWorkspace = config.getPath("bazel_tools_workspace").getPathString();
+    String bazelPlatformsWorkspace = config.getPath("platforms_workspace").getPathString();
+    String rulesJavaWorkspace = config.getPath("rules_java_workspace").getPathString();
     String localConfigPlatformWorkspace =
-        config.getPath("/local_config_platform_workspace").getPathString();
+        config.getPath("local_config_platform_workspace").getPathString();
 
     return new ArrayList<>(
         ImmutableList.of(
             "local_repository(name = 'bazel_tools', path = '" + bazelToolWorkspace + "')",
             "local_repository(name = 'platforms', path = '" + bazelPlatformsWorkspace + "')",
-            "local_repository(name = 'local_config_xcode', path = '/local_config_xcode')",
-            "local_repository(name = 'com_google_protobuf', path = '/protobuf')",
+            "local_repository(name = 'local_config_xcode', path = '" + xcodeWorkspace + "')",
+            "local_repository(name = 'com_google_protobuf', path = '" + protobufWorkspace + "')",
             "local_repository(name = 'rules_java', path = '" + rulesJavaWorkspace + "')",
             "register_toolchains('@rules_java//java/toolchains/runtime:all')",
             "register_toolchains('@rules_java//java/toolchains/javac:all')",
@@ -100,15 +102,17 @@
   @Override
   public void setupMockClient(MockToolsConfig config, List<String> workspaceContents)
       throws IOException {
-    config.create("/local_config_xcode/BUILD", "xcode_config(name = 'host_xcodes')");
+    config.create("local_config_xcode_workspace/BUILD", "xcode_config(name = 'host_xcodes')");
     config.create(
-        "/protobuf/BUILD", "licenses(['notice'])", "exports_files(['protoc', 'cc_toolchain'])");
-    config.create("/local_config_xcode/WORKSPACE");
-    config.create("/protobuf/WORKSPACE");
-    config.overwrite("WORKSPACE", workspaceContents.toArray(new String[workspaceContents.size()]));
+        "protobuf_workspace/BUILD",
+        "licenses(['notice'])",
+        "exports_files(['protoc', 'cc_toolchain'])");
+    config.create("local_config_xcode_workspace/WORKSPACE");
+    config.create("protobuf_workspace/WORKSPACE");
+    config.overwrite("WORKSPACE", workspaceContents.toArray(new String[0]));
     /** The rest of platforms is initialized in {@link MockPlatformSupport}. */
-    config.create("/platforms/WORKSPACE", "workspace(name = 'platforms')");
-    config.create("/bazel_tools_workspace/WORKSPACE", "workspace(name = 'bazel_tools')");
+    config.create("platforms_workspace/WORKSPACE", "workspace(name = 'platforms')");
+    config.create("bazel_tools_workspace/WORKSPACE", "workspace(name = 'bazel_tools')");
     Runfiles runfiles = Runfiles.create();
     for (String filename : Arrays.asList("tools/jdk/java_toolchain_alias.bzl")) {
       java.nio.file.Path path = Paths.get(runfiles.rlocation("io_bazel/" + filename));
@@ -116,10 +120,10 @@
         continue; // the io_bazel workspace root only exists for Bazel
       }
       config.create(
-          "/bazel_tools_workspace/" + filename, MoreFiles.asCharSource(path, UTF_8).read());
+          "bazel_tools_workspace/" + filename, MoreFiles.asCharSource(path, UTF_8).read());
     }
     config.create(
-        "/bazel_tools_workspace/tools/jdk/BUILD",
+        "bazel_tools_workspace/tools/jdk/BUILD",
         "load(",
         "    ':java_toolchain_alias.bzl',",
         "    'java_toolchain_alias',",
@@ -208,17 +212,16 @@
 
     ImmutableList<String> androidBuildContents = createAndroidBuildContents();
     config.create(
-        "/bazel_tools_workspace/tools/android/BUILD",
-        androidBuildContents.toArray(new String[androidBuildContents.size()]));
+        "bazel_tools_workspace/tools/android/BUILD", androidBuildContents.toArray(new String[0]));
     config.create(
-        "/bazel_tools_workspace/tools/android/emulator/BUILD",
+        "bazel_tools_workspace/tools/android/emulator/BUILD",
         Iterables.toArray(createToolsAndroidEmulatorContents(), String.class));
 
     config.create(
-        "/bazel_tools_workspace/tools/genrule/BUILD", "exports_files(['genrule-setup.sh'])");
+        "bazel_tools_workspace/tools/genrule/BUILD", "exports_files(['genrule-setup.sh'])");
 
     config.create(
-        "/bazel_tools_workspace/tools/test/BUILD",
+        "bazel_tools_workspace/tools/test/BUILD",
         "filegroup(name = 'runtime', srcs = ['test-setup.sh', 'test-xml-generator.sh'])",
         "filegroup(name = 'test_wrapper', srcs = ['test_wrapper_bin'])",
         "filegroup(name = 'xml_writer', srcs = ['xml_writer_bin'])",
@@ -232,7 +235,7 @@
 
     // Use an alias package group to allow for modification at the simpler path
     config.create(
-        "/bazel_tools_workspace/tools/whitelists/config_feature_flag/BUILD",
+        "bazel_tools_workspace/tools/whitelists/config_feature_flag/BUILD",
         "package_group(",
         "    name='config_feature_flag',",
         "    includes=['@//tools/whitelists/config_feature_flag'],",
@@ -247,24 +250,24 @@
         "package_group(name='config_feature_flag', packages=['//...'])");
 
     config.create(
-        "/bazel_tools_workspace/tools/zip/BUILD",
+        "bazel_tools_workspace/tools/zip/BUILD",
         "package(default_visibility=['//visibility:public'])",
         "exports_files(['precompile.py'])",
         "cc_binary(name='zipper', srcs=['zip_main.cc'])");
 
     config.create(
-        "/bazel_tools_workspace/tools/launcher/BUILD",
+        "bazel_tools_workspace/tools/launcher/BUILD",
         "package(default_visibility=['//visibility:public'])",
         "load('@bazel_tools//third_party/cc_rules/macros:defs.bzl', 'cc_binary')",
         "cc_binary(name='launcher', srcs=['launcher_main.cc'])");
 
     config.create(
-        "/bazel_tools_workspace/tools/def_parser/BUILD",
+        "bazel_tools_workspace/tools/def_parser/BUILD",
         "package(default_visibility=['//visibility:public'])",
         "filegroup(name='def_parser', srcs=['def_parser.exe'])");
 
     config.create(
-        "/bazel_tools_workspace/objcproto/BUILD",
+        "bazel_tools_workspace/objcproto/BUILD",
         "package(default_visibility=['//visibility:public'])",
         "objc_library(",
         "  name = 'protobuf_lib',",
@@ -277,14 +280,14 @@
         "  name = 'well_known_type_proto',",
         "  srcs = ['well_known_type.proto'],",
         ")");
-    config.create("/bazel_tools_workspace/objcproto/empty.m");
-    config.create("/bazel_tools_workspace/objcproto/empty.cc");
-    config.create("/bazel_tools_workspace/objcproto/well_known_type.proto");
+    config.create("bazel_tools_workspace/objcproto/empty.m");
+    config.create("bazel_tools_workspace/objcproto/empty.cc");
+    config.create("bazel_tools_workspace/objcproto/well_known_type.proto");
 
-    config.create("/rules_java_workspace/WORKSPACE", "workspace(name = 'rules_java')");
-    config.create("/rules_java_workspace/java/BUILD");
+    config.create("rules_java_workspace/WORKSPACE", "workspace(name = 'rules_java')");
+    config.create("rules_java_workspace/java/BUILD");
     config.create(
-        "/rules_java_workspace/java/defs.bzl",
+        "rules_java_workspace/java/defs.bzl",
         "def java_binary(**attrs):",
         "    native.java_binary(**attrs)",
         "def java_library(**attrs):",
@@ -292,14 +295,14 @@
         "def java_import(**attrs):",
         "    native.java_import(**attrs)");
     config.create(
-        "/rules_java_workspace/java/repositories.bzl",
+        "rules_java_workspace/java/repositories.bzl",
         "def rules_java_dependencies():",
         "    pass",
         "def rules_java_toolchains():",
         "    pass");
 
     config.create(
-        "/rules_java_workspace/java/toolchains/runtime/BUILD",
+        "rules_java_workspace/java/toolchains/runtime/BUILD",
         "toolchain_type(name = 'toolchain_type')",
         "toolchain(",
         "    name = 'local_jdk',",
@@ -307,7 +310,7 @@
         "    toolchain_type = '@rules_java//java/toolchains/runtime:toolchain_type',",
         "    )");
     config.create(
-        "/rules_java_workspace/java/toolchains/javac/BUILD",
+        "rules_java_workspace/java/toolchains/javac/BUILD",
         "toolchain_type(name = 'toolchain_type')",
         "toolchain(",
         "    name = 'javac_toolchain',",
@@ -419,15 +422,15 @@
 
   @Override
   public void setupMockToolsRepository(MockToolsConfig config) throws IOException {
-    config.create("/bazel_tools_workspace/WORKSPACE", "workspace(name = 'bazel_tools')");
-    config.create("/bazel_tools_workspace/tools/build_defs/repo/BUILD");
+    config.create("bazel_tools_workspace/WORKSPACE", "workspace(name = 'bazel_tools')");
+    config.create("bazel_tools_workspace/tools/build_defs/repo/BUILD");
     config.create(
-        "/bazel_tools_workspace/tools/build_defs/repo/utils.bzl",
+        "bazel_tools_workspace/tools/build_defs/repo/utils.bzl",
         "def maybe(repo_rule, name, **kwargs):",
         "  if name not in native.existing_rules():",
         "    repo_rule(name = name, **kwargs)");
     config.create(
-        "/bazel_tools_workspace/tools/build_defs/repo/http.bzl",
+        "bazel_tools_workspace/tools/build_defs/repo/http.bzl",
         "def http_archive(**kwargs):",
         "  pass",
         "",
diff --git a/src/test/java/com/google/devtools/build/lib/analysis/util/BuildViewTestCase.java b/src/test/java/com/google/devtools/build/lib/analysis/util/BuildViewTestCase.java
index c8d503a..18fe94c 100644
--- a/src/test/java/com/google/devtools/build/lib/analysis/util/BuildViewTestCase.java
+++ b/src/test/java/com/google/devtools/build/lib/analysis/util/BuildViewTestCase.java
@@ -234,15 +234,15 @@
 
     actionKeyContext = new ActionKeyContext();
     mockToolsConfig = new MockToolsConfig(rootDirectory, false);
-    mockToolsConfig.create("/bazel_tools_workspace/WORKSPACE", "workspace(name = 'bazel_tools')");
-    mockToolsConfig.create("/bazel_tools_workspace/tools/build_defs/repo/BUILD");
+    mockToolsConfig.create("bazel_tools_workspace/WORKSPACE", "workspace(name = 'bazel_tools')");
+    mockToolsConfig.create("bazel_tools_workspace/tools/build_defs/repo/BUILD");
     mockToolsConfig.create(
-        "/bazel_tools_workspace/tools/build_defs/repo/utils.bzl",
+        "bazel_tools_workspace/tools/build_defs/repo/utils.bzl",
         "def maybe(repo_rule, name, **kwargs):",
         "  if name not in native.existing_rules():",
         "    repo_rule(name = name, **kwargs)");
     mockToolsConfig.create(
-        "/bazel_tools_workspace/tools/build_defs/repo/http.bzl",
+        "bazel_tools_workspace/tools/build_defs/repo/http.bzl",
         "def http_archive(**kwargs):",
         "  pass",
         "",
diff --git a/src/test/java/com/google/devtools/build/lib/analysis/util/ConfigurationTestCase.java b/src/test/java/com/google/devtools/build/lib/analysis/util/ConfigurationTestCase.java
index 3ed7d1a..1956036 100644
--- a/src/test/java/com/google/devtools/build/lib/analysis/util/ConfigurationTestCase.java
+++ b/src/test/java/com/google/devtools/build/lib/analysis/util/ConfigurationTestCase.java
@@ -111,15 +111,15 @@
             analysisMock.getProductName());
 
     mockToolsConfig = new MockToolsConfig(rootDirectory);
-    mockToolsConfig.create("/bazel_tools_workspace/WORKSPACE", "workspace(name = 'bazel_tools')");
-    mockToolsConfig.create("/bazel_tools_workspace/tools/build_defs/repo/BUILD");
+    mockToolsConfig.create("bazel_tools_workspace/WORKSPACE", "workspace(name = 'bazel_tools')");
+    mockToolsConfig.create("bazel_tools_workspace/tools/build_defs/repo/BUILD");
     mockToolsConfig.create(
-        "/bazel_tools_workspace/tools/build_defs/repo/utils.bzl",
+        "bazel_tools_workspace/tools/build_defs/repo/utils.bzl",
         "def maybe(repo_rule, name, **kwargs):",
         "  if name not in native.existing_rules():",
         "    repo_rule(name = name, **kwargs)");
     mockToolsConfig.create(
-        "/bazel_tools_workspace/tools/build_defs/repo/http.bzl",
+        "bazel_tools_workspace/tools/build_defs/repo/http.bzl",
         "def http_archive(**kwargs):",
         "  pass",
         "",
diff --git a/src/test/java/com/google/devtools/build/lib/bazel/rules/android/AndroidNdkRepositoryTest.java b/src/test/java/com/google/devtools/build/lib/bazel/rules/android/AndroidNdkRepositoryTest.java
index c07889f..1884484 100644
--- a/src/test/java/com/google/devtools/build/lib/bazel/rules/android/AndroidNdkRepositoryTest.java
+++ b/src/test/java/com/google/devtools/build/lib/bazel/rules/android/AndroidNdkRepositoryTest.java
@@ -48,14 +48,14 @@
   @Before
   public void setup() throws Exception {
     BazelMockCcSupport.INSTANCE.setup(mockToolsConfig);
-    scratch.overwriteFile("/bazel_tools_workspace/tools/build_defs/cc/BUILD");
+    scratch.overwriteFile("bazel_tools_workspace/tools/build_defs/cc/BUILD");
     scratch.overwriteFile(
-        "/bazel_tools_workspace/tools/build_defs/cc/action_names.bzl",
+        "bazel_tools_workspace/tools/build_defs/cc/action_names.bzl",
         ResourceLoader.readFromResources(
             TestConstants.RULES_CC_REPOSITORY_EXECROOT + "cc/action_names.bzl"));
 
     scratch.overwriteFile(
-        "/bazel_tools_workspace/tools/cpp/cc_toolchain_config_lib.bzl",
+        "bazel_tools_workspace/tools/cpp/cc_toolchain_config_lib.bzl",
         ResourceLoader.readFromResources(
             TestConstants.RULES_CC_REPOSITORY_EXECROOT + "cc/cc_toolchain_config_lib.bzl"));
     scratch.file("/ndk/source.properties", "Pkg.Desc = Android NDK", "Pkg.Revision = 13.1.3345770");
@@ -72,9 +72,10 @@
   @Test
   public void testApiLevelHighestVersionDetection() throws Exception {
     scratchPlatformsDirectories("arch-x86", 19, 20, 22, 24);
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
     FileSystemUtils.appendIsoLatin1(
         scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_ndk_repository(",
         "    name = 'androidndk',",
         "    path = '/ndk',",
@@ -96,9 +97,10 @@
   @Test
   public void testInvalidNdkReleaseTxt() throws Exception {
     scratchPlatformsDirectories("arch-x86", 24);
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
     FileSystemUtils.appendIsoLatin1(
         scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_ndk_repository(",
         "    name = 'androidndk',",
         "    path = '/ndk',",
@@ -121,9 +123,10 @@
   @Test
   public void testInvalidNdkSourceProperties() throws Exception {
     scratchPlatformsDirectories("arch-x86", 24);
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
     FileSystemUtils.appendIsoLatin1(
         scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_ndk_repository(",
         "    name = 'androidndk',",
         "    path = '/ndk',",
@@ -148,9 +151,10 @@
   @Test
   public void testUnsupportedNdkVersion() throws Exception {
     scratchPlatformsDirectories("arch-x86", 24);
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
     FileSystemUtils.appendIsoLatin1(
         scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_ndk_repository(",
         "    name = 'androidndk',",
         "    path = '/ndk',",
@@ -175,9 +179,10 @@
     scratchPlatformsDirectories("arch-x86", 19, 20, 22, 24);
     scratch.file(String.format("/ndk/sources/android/cpufeatures/cpu-features.c"));
     scratch.file(String.format("/ndk/sources/android/cpufeatures/cpu-features.h"));
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
     FileSystemUtils.appendIsoLatin1(
         scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_ndk_repository(",
         "    name = 'androidndk',",
         "    path = '/ndk',",
@@ -198,9 +203,10 @@
 
   @Test
   public void testMissingPlatformsDirectory() throws Exception {
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
     FileSystemUtils.appendIsoLatin1(
         scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_ndk_repository(",
         "    name = 'androidndk',",
         "    path = '/ndk',",
diff --git a/src/test/java/com/google/devtools/build/lib/bazel/rules/android/AndroidSdkRepositoryTest.java b/src/test/java/com/google/devtools/build/lib/bazel/rules/android/AndroidSdkRepositoryTest.java
index cdce62a..f044336 100644
--- a/src/test/java/com/google/devtools/build/lib/bazel/rules/android/AndroidSdkRepositoryTest.java
+++ b/src/test/java/com/google/devtools/build/lib/bazel/rules/android/AndroidSdkRepositoryTest.java
@@ -36,7 +36,7 @@
   @Before
   public void setup() throws Exception {
     scratch.file(
-        "/bazel_tools_workspace/tools/android/android_sdk_repository_template.bzl",
+        "bazel_tools_workspace/tools/android/android_sdk_repository_template.bzl",
         ResourceLoader.readFromResources("tools/android/android_sdk_repository_template.bzl"));
   }
 
@@ -84,8 +84,10 @@
     scratchPlatformsDirectories(25);
     scratchBuildToolsDirectories("26.0.1");
     scratchExtrasLibrary("extras/google/m2repository", "com.google.android", "foo", "1.0.0", "aar");
-    FileSystemUtils.appendIsoLatin1(scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
+    FileSystemUtils.appendIsoLatin1(
+        scratch.resolve("WORKSPACE"),
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_sdk_repository(",
         "    name = 'androidsdk',",
         "    path = '/sdk',",
@@ -104,8 +106,10 @@
     scratchPlatformsDirectories(25);
     scratchBuildToolsDirectories("26.0.1");
     scratchExtrasLibrary("extras/google/m2repository", "com.google.android", "foo", "1.0.0", "aar");
-    FileSystemUtils.appendIsoLatin1(scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
+    FileSystemUtils.appendIsoLatin1(
+        scratch.resolve("WORKSPACE"),
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_sdk_repository(",
         "    name = 'androidsdk',",
         "    path = '/sdk',",
@@ -124,8 +128,10 @@
     scratchExtrasLibrary("extras/google/m2repository", "com.google.android", "a", "1.0.0", "jar");
     scratchExtrasLibrary("extras/android/m2repository", "com.android.support", "b", "1.0.0", "aar");
     scratchExtrasLibrary("extras/m2repository", "com.android.support", "c", "1.0.1", "aar");
-    FileSystemUtils.appendIsoLatin1(scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
+    FileSystemUtils.appendIsoLatin1(
+        scratch.resolve("WORKSPACE"),
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_sdk_repository(",
         "    name = 'androidsdk',",
         "    path = '/sdk',",
@@ -150,8 +156,10 @@
   public void testSystemImageDirectoriesAreFound() throws Exception {
     scratchPlatformsDirectories(25);
     scratchBuildToolsDirectories("26.0.1");
-    FileSystemUtils.appendIsoLatin1(scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
+    FileSystemUtils.appendIsoLatin1(
+        scratch.resolve("WORKSPACE"),
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_sdk_repository(",
         "    name = 'androidsdk',",
         "    path = '/sdk',",
@@ -184,8 +192,10 @@
     scratchPlatformsDirectories(25, 26);
     scratchBuildToolsDirectories("26.0.1");
     scratchSystemImagesDirectories("android-25/default/armeabi-v7a", "android-O/google_apis/x86");
-    FileSystemUtils.appendIsoLatin1(scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
+    FileSystemUtils.appendIsoLatin1(
+        scratch.resolve("WORKSPACE"),
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_sdk_repository(",
         "    name = 'androidsdk',",
         "    path = '/sdk',",
@@ -198,9 +208,10 @@
   public void testBuildToolsHighestVersionDetection() throws Exception {
     scratchPlatformsDirectories(25);
     scratchBuildToolsDirectories("26.0.1", "26.0.2");
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
     FileSystemUtils.appendIsoLatin1(
         scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_sdk_repository(",
         "    name = 'androidsdk',",
         "    path = '/sdk',",
@@ -218,9 +229,10 @@
   public void testApiLevelHighestVersionDetection() throws Exception {
     scratchPlatformsDirectories(24, 25, 23);
     scratchBuildToolsDirectories("26.0.1");
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
     FileSystemUtils.appendIsoLatin1(
         scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_sdk_repository(",
         "    name = 'androidsdk',",
         "    path = '/sdk',",
@@ -239,9 +251,10 @@
     int[] apiLevels = {23, 24, 25};
     scratchPlatformsDirectories(apiLevels);
     scratchBuildToolsDirectories("26.0.1");
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
     FileSystemUtils.appendIsoLatin1(
         scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_sdk_repository(",
         "    name = 'androidsdk',",
         "    path = '/sdk',",
@@ -263,9 +276,10 @@
   public void testMissingApiLevel() throws Exception {
     scratchPlatformsDirectories(24);
     scratchBuildToolsDirectories("26.0.1");
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
     FileSystemUtils.appendIsoLatin1(
         scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_sdk_repository(",
         "    name = 'androidsdk',",
         "    path = '/sdk',",
@@ -292,8 +306,10 @@
     scratchPlatformsDirectories(24);
     scratchBuildToolsDirectories("26.0.1");
     scratch.file("/sdk/system-images/.DS_Store");
-    FileSystemUtils.appendIsoLatin1(scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
+    FileSystemUtils.appendIsoLatin1(
+        scratch.resolve("WORKSPACE"),
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_sdk_repository(",
         "    name = 'androidsdk',",
         "    path = '/sdk',",
@@ -306,9 +322,10 @@
   @Test
   public void testMissingPlatformsDirectory() throws Exception {
     scratchBuildToolsDirectories("26.0.1");
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
     FileSystemUtils.appendIsoLatin1(
         scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_sdk_repository(",
         "    name = 'androidsdk',",
         "    path = '/sdk',",
@@ -328,9 +345,10 @@
   @Test
   public void testMissingBuildToolsDirectory() throws Exception {
     scratchPlatformsDirectories(24);
+    String bazelToolsWorkspace = scratch.dir("bazel_tools_workspace").getPathString();
     FileSystemUtils.appendIsoLatin1(
         scratch.resolve("WORKSPACE"),
-        "local_repository(name = 'bazel_tools', path = '/bazel_tools_workspace')",
+        "local_repository(name = 'bazel_tools', path = '" + bazelToolsWorkspace + "')",
         "android_sdk_repository(",
         "    name = 'androidsdk',",
         "    path = '/sdk',",
diff --git a/src/test/java/com/google/devtools/build/lib/packages/util/BazelMockCcSupport.java b/src/test/java/com/google/devtools/build/lib/packages/util/BazelMockCcSupport.java
index f02c256..033ef7c 100644
--- a/src/test/java/com/google/devtools/build/lib/packages/util/BazelMockCcSupport.java
+++ b/src/test/java/com/google/devtools/build/lib/packages/util/BazelMockCcSupport.java
@@ -82,7 +82,7 @@
 
   @Override
   public String getMockCrosstoolPath() {
-    return "/bazel_tools_workspace/tools/cpp/";
+    return "bazel_tools_workspace/tools/cpp/";
   }
 
   @Override
diff --git a/src/test/java/com/google/devtools/build/lib/packages/util/MockToolsConfig.java b/src/test/java/com/google/devtools/build/lib/packages/util/MockToolsConfig.java
index 255a1b9..146fc86 100644
--- a/src/test/java/com/google/devtools/build/lib/packages/util/MockToolsConfig.java
+++ b/src/test/java/com/google/devtools/build/lib/packages/util/MockToolsConfig.java
@@ -51,6 +51,7 @@
     if (!realFileSystem) {
       this.runfilesDirectory = null;
     } else if (runfilesDirectoryOpt == null) {
+      // Turning the absolute path string from runfilesDir into a Path object.
       this.runfilesDirectory = rootDirectory.getRelative(BlazeTestUtils.runfilesDir());
     } else {
       this.runfilesDirectory = runfilesDirectoryOpt;
@@ -62,11 +63,12 @@
   }
 
   public Path getPath(String relativePath) {
+    Preconditions.checkState(!relativePath.startsWith("/"), relativePath);
     return rootDirectory.getRelative(relativePath);
   }
 
   public Path create(String relativePath, String... lines) throws IOException {
-    Path path = rootDirectory.getRelative(relativePath);
+    Path path = getPath(relativePath);
     if (!path.exists()) {
       FileSystemUtils.writeIsoLatin1(path, lines);
     } else if (lines.length > 0) {
@@ -93,7 +95,7 @@
   }
 
   public Path overwrite(String relativePath, String... lines) throws IOException {
-    Path path = rootDirectory.getRelative(relativePath);
+    Path path = getPath(relativePath);
     if (path.exists()) {
       path.deleteTree();
     }
@@ -101,7 +103,7 @@
   }
 
   public Path append(String relativePath, String... lines) throws IOException {
-    Path path = rootDirectory.getRelative(relativePath);
+    Path path = getPath(relativePath);
     if (!path.exists()) {
       return create(relativePath, lines);
     }
@@ -144,15 +146,14 @@
       // In some cases we run tests in a special client with a ../READONLY/ path where we may also
       // find the runfiles. Try that, too.
       Path readOnlyClientPath =
-          rootDirectory.getRelative(
-              "../READONLY/" + TestConstants.WORKSPACE_NAME + "/" + relativePath);
+          getPath("../READONLY/" + TestConstants.WORKSPACE_NAME + "/" + relativePath);
       if (!readOnlyClientPath.exists()) {
         throw new IOException("target does not exist " + target);
       } else {
         target = readOnlyClientPath;
       }
     }
-    Path path = rootDirectory.getRelative(dest);
+    Path path = getPath(dest);
     FileSystemUtils.createDirectoryAndParents(path.getParentDirectory());
     path.delete();
     path.createSymbolicLink(target);
diff --git a/src/test/java/com/google/devtools/build/lib/rules/cpp/CcSkylarkApiProviderTest.java b/src/test/java/com/google/devtools/build/lib/rules/cpp/CcSkylarkApiProviderTest.java
index 071fffb..7daf7f3 100644
--- a/src/test/java/com/google/devtools/build/lib/rules/cpp/CcSkylarkApiProviderTest.java
+++ b/src/test/java/com/google/devtools/build/lib/rules/cpp/CcSkylarkApiProviderTest.java
@@ -70,9 +70,9 @@
       return;
     }
 
-    mockToolsConfig.create("/protobuf/WORKSPACE");
+    mockToolsConfig.create("protobuf_workspace/WORKSPACE");
     mockToolsConfig.overwrite(
-        "/protobuf/BUILD",
+        "protobuf_workspace/BUILD",
         TestConstants.LOAD_PROTO_LANG_TOOLCHAIN,
         "package(default_visibility=['//visibility:public'])",
         "exports_files(['protoc'])",
@@ -86,7 +86,7 @@
         new String(FileSystemUtils.readContentAsLatin1(rootDirectory.getRelative("WORKSPACE")));
     mockToolsConfig.overwrite(
         "WORKSPACE",
-        "local_repository(name = 'com_google_protobuf', path = '/protobuf/')",
+        "local_repository(name = 'com_google_protobuf', path = 'protobuf_workspace/')",
         existingWorkspace);
     invalidatePackages(); // A dash of magic to re-evaluate the WORKSPACE file.
 
diff --git a/src/test/java/com/google/devtools/build/lib/testutil/TestConstants.java b/src/test/java/com/google/devtools/build/lib/testutil/TestConstants.java
index 6b64869..e972cad 100644
--- a/src/test/java/com/google/devtools/build/lib/testutil/TestConstants.java
+++ b/src/test/java/com/google/devtools/build/lib/testutil/TestConstants.java
@@ -104,7 +104,7 @@
   /** The workspace repository label under which built-in tools reside. */
   public static final String TOOLS_REPOSITORY = "@bazel_tools";
   /** The file path in which to create files so that they end up under {@link #TOOLS_REPOSITORY}. */
-  public static final String TOOLS_REPOSITORY_SCRATCH = "/bazel_tools_workspace/";
+  public static final String TOOLS_REPOSITORY_SCRATCH = "bazel_tools_workspace/";
 
   /** The output file path prefix for tool file dependencies. */
   public static final String TOOLS_REPOSITORY_PATH_PREFIX = "external/bazel_tools/";
@@ -114,7 +114,7 @@
   /**
    * The file path in which to create files so that they end up under {@link #RULES_CC_REPOSITORY}.
    */
-  public static final String RULES_CC_REPOSITORY_SCRATCH = "/rules_cc_workspace/";
+  public static final String RULES_CC_REPOSITORY_SCRATCH = "rules_cc_workspace/";
   /** The directory in which rules_cc repo resides in execroot. */
   public static final String RULES_CC_REPOSITORY_EXECROOT = "external/rules_cc/";
 
@@ -158,9 +158,9 @@
   public static final String PLATFORM_PACKAGE_ROOT = "@bazel_tools//platforms";
   public static final String CONSTRAINTS_PACKAGE_ROOT = "@platforms//";
 
-  public static final String PLATFORMS_PATH = "/bazel_tools_workspace/platforms";
-  public static final String CONSTRAINTS_PATH = "/platforms";
-  public static final String LOCAL_CONFIG_PLATFORM_PATH = "/local_config_platform_workspace";
+  public static final String PLATFORMS_PATH = "bazel_tools_workspace/platforms";
+  public static final String CONSTRAINTS_PATH = "platforms_workspace";
+  public static final String LOCAL_CONFIG_PLATFORM_PATH = "local_config_platform_workspace";
 
   public static final String PLATFORM_LABEL =
       PLATFORM_PACKAGE_ROOT + ":default_host + " + PLATFORM_PACKAGE_ROOT + ":default_target";