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本文介紹了如何通過Bazel從JUnit測試執(zhí)行中找到指向Java源代碼文件的路徑的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！

問題描述

我想通過JUnit測試檢查我們的monorepo代碼庫中的一個文本文件。JUnit測試通過bazel test命令執(zhí)行。如何將Bazel配置為將源代碼目錄路徑(而不是緩存的編譯JAR文件路徑)傳遞給單元測試？它可以是CLI參數(shù)、環(huán)境變量等。

推薦答案

要做到這一點，一種方法是使用data屬性，該屬性使文件在運行時可用于測試(和其他二進制文件)，而對于Java，Bazel提供了用于查找數(shù)據文件的運行文件庫。例如：

BUILD：

java_test(
  name = "TextFileTest",
  srcs = ["javatests/txtfile/TextFileTest.java"],
  data = ["text.txt"],
  deps = [
      "@bazel_tools//tools/java/runfiles:runfiles",
      "@maven//:junit_junit",
  ],
)

WORKSPACE：

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

RULES_JVM_EXTERNAL_TAG = "4.2"
RULES_JVM_EXTERNAL_SHA = "cd1a77b7b02e8e008439ca76fd34f5b07aecb8c752961f9640dea15e9e5ba1ca"

http_archive(
    name = "rules_jvm_external",
    strip_prefix = "rules_jvm_external-%s" % RULES_JVM_EXTERNAL_TAG,
    sha256 = RULES_JVM_EXTERNAL_SHA,
    url = "https://github.com/bazelbuild/rules_jvm_external/archive/%s.zip" % RULES_JVM_EXTERNAL_TAG,
)

load("@rules_jvm_external//:defs.bzl", "maven_install")

maven_install(
    artifacts = [
        "junit:junit:4.13.2",
    ],
    repositories = [
        "https://repo1.maven.org/maven2",
    ],
)

javatests/txtfile/TextFileTest.java：

package txtfile;

import com.google.devtools.build.runfiles.Runfiles;

import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.Path;

import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

@RunWith(JUnit4.class)
public class TextFileTest {

  @Test
  public void testTextFile() throws Exception {
    Runfiles runfiles = Runfiles.create();
    Path path = Paths.get(runfiles.rlocation("__main__/text.txt"));
    String line = Files.readAllLines(path).get(0);
    Assert.assertEquals(line, "this is text");
  }
}

text.txt：

this is text

$ bazel test TextFileTest
INFO: Build option --test_sharding_strategy has changed, discarding analysis cache.
INFO: Analyzed target //:TextFileTest (0 packages loaded, 547 targets configured).
INFO: Found 1 test target...
Target //:TextFileTest up-to-date:
  bazel-bin/TextFileTest.jar
  bazel-bin/TextFileTest
INFO: Elapsed time: 0.288s, Critical Path: 0.01s
INFO: 1 process: 1 internal.
INFO: Build completed successfully, 1 total action
//:TextFileTest                                                 (cached) PASSED in 0.3s

Executed 0 out of 1 test: 1 test passes.
INFO: Build completed successfully, 1 total action

請注意，在runfiles.rlocation("__main__/text.txt")中，__main__是工作區(qū)名稱，默認情況下為__main__。如果工作區(qū)文件中有workspace(name = "workspace name")，則工作區(qū)名稱將從中設置。

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