Remove bazel-diff and bazel-differ comparison tests (#106)

These were useful while we were bootstrapping the project, but we are
not updating these any more, and we are unlikely to change the
behaviour of Target Determinator if an update causes some of these
comparison tests to fail.

For both of these reasons, it makes sense to remove the tests.

Author: shs96c

WORKSPACE

@@ -29,14 +29,6 @@ load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies", "go_repository")
 
 gazelle_dependencies()
 
-# Pull in bazel_diff for testing.
-http_file(
-    name = "bazel_diff",
-    downloaded_file_path = "bazel-diff_deploy.jar",
-    sha256 = "5f36e74a8d6167e4d31f663526a63be3e3728456d8b5b4a84503315dd10e65e7",
-    url = "https://github.com/Tinder/bazel-diff/releases/download/9.0.0/bazel-diff_deploy.jar",
-)
-
 RULES_JVM_EXTERNAL_TAG = "6.7"
 
 RULES_JVM_EXTERNAL_SHA = "a1e351607f04fed296ba33c4977d3fe2a615ed50df7896676b67aac993c53c18"
@@ -109,35 +101,3 @@ load("//:third_party/go/deps.bzl", "go_dependencies")
 
 # gazelle:repository_macro third_party/go/deps.bzl%go_dependencies
 go_dependencies()
-
-##########################################################
-# bazel-differ: https://github.com/ewhauser/bazel-differ #
-##########################################################
-
-http_file(
-    name = "bazel_differ_linux_arm64",
-    executable = True,
-    integrity = "sha256-eFjQ2D6auwcnycoY67qOx6NJPsI2ZKSUv1cPdaBVtOo=",
-    url = "https://github.com/ewhauser/bazel-differ/releases/download/v0.0.7/bazel-differ-linux-arm64",
-)
-
-http_file(
-    name = "bazel_differ_linux_x86_64",
-    executable = True,
-    integrity = "sha256-quwSTcr6dHF0Jh7JyCR74zMsItHRcS7YD7YSAClp5CA=",
-    url = "https://github.com/ewhauser/bazel-differ/releases/download/v0.0.7/bazel-differ-linux-x86_64",
-)
-
-http_file(
-    name = "bazel_differ_darwin_arm64",
-    executable = True,
-    integrity = "sha256-0dbJKJXHzTr0/43nJxFO+xGbCPiGYEqVirve25SXss4=",
-    url = "https://github.com/ewhauser/bazel-differ/releases/download/v0.0.7/bazel-differ-darwin-arm64",
-)
-
-http_file(
-    name = "bazel_differ_darwin_x86_64",
-    executable = True,
-    integrity = "sha256-wS/sbX/XgsIaX51VUOGyv7wRzKkmOUgLHzx+wg2weVE=",
-    url = "https://github.com/ewhauser/bazel-differ/releases/download/v0.0.7/bazel-differ-darwin-x86_64",
-)

tests/integration/java/com/github/bazel_contrib/target_determinator/integration/BUILD.bazel

@@ -1,64 +1,6 @@
 load("@bazel_skylib//rules:copy_file.bzl", "copy_file")
 load("@rules_jvm_external//:defs.bzl", "artifact")
 
-java_test(
-    name = "BazelDiffIntegrationTest",
-    timeout = "long",
-    srcs = [
-        "BazelDiffIntegrationTest.java",
-    ],
-    data = [":bazel-diff"],
-    env_inherit = ["CC"],
-    tags = ["no-sandbox"],
-    deps = [
-        ":tests",
-        ":util",
-        artifact("com.google.guava:guava"),
-        artifact("com.google.code.findbugs:jsr305"),
-        artifact("junit:junit"),
-        "//tests/integration/java/com/github/bazel_contrib/target_determinator/label",
-        "@bazel_tools//tools/java/runfiles",
-    ],
-)
-
-java_import(
-    name = "raw-bazel-diff-deploy-jar",
-    jars = [
-        "@bazel_diff//file",
-    ],
-)
-
-java_binary(
-    name = "bazel-diff",
-    main_class = "com.bazel_diff.Main",
-    runtime_deps = [":raw-bazel-diff-deploy-jar"],
-)
-
-java_test(
-    name = "BazelDifferIntegrationTest",
-    timeout = "long",
-    srcs = [
-        "BazelDifferIntegrationTest.java",
-    ],
-    data = [":bazel-differ-binary"],
-    env_inherit = [
-        "CC",
-        "PATH",
-    ],
-    jvm_flags = [
-        "-Dbazel_differ=$(rootpath :bazel-differ-binary)",
-    ],
-    tags = ["no-sandbox"],
-    deps = [
-        ":tests",
-        ":util",
-        artifact("com.google.guava:guava"),
-        artifact("com.google.code.findbugs:jsr305"),
-        artifact("junit:junit"),
-        "//tests/integration/java/com/github/bazel_contrib/target_determinator/label",
-    ],
-)
-
 java_test(
     name = "TargetDeterminatorIntegrationTest",
     timeout = "long",
@@ -70,7 +12,7 @@ java_test(
     jvm_flags = [
         "-Dtarget_determinator=$(rootpath //target-determinator)",
     ],
-    shard_count = 3,
+    shard_count = 5,
     tags = ["no-sandbox"],
     deps = [
         ":tests",
@@ -135,19 +77,3 @@ java_library(
         artifact("org.hamcrest:hamcrest-all"),
     ],
 )
-
-copy_file(
-    name = "bazel-differ-binary",
-    src = ":original-bazel-differ",
-    out = "bazel-differ",
-)
-
-alias(
-    name = "original-bazel-differ",
-    actual = select({
-        "//:linux_arm64": "@bazel_differ_linux_arm64//file",
-        "//:linux_x86_64": "@bazel_differ_linux_x86_64//file",
-        "//:macos_arm64": "@bazel_differ_darwin_arm64//file",
-        "//:macos_x86_64": "@bazel_differ_darwin_x86_64//file",
-    }),
-)