GoogleAuthUtilsTest.java

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package com.google.auth.oauth2;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.UncheckedIOException;
import org.junit.jupiter.api.Test;

class GoogleAuthUtilsTest {

  @Test
  void getWellKnownCredentialsFile_windows_nullAppData_throwsUncheckedIOException() {
    DefaultCredentialsProviderTest.TestDefaultCredentialsProvider provider =
        new DefaultCredentialsProviderTest.TestDefaultCredentialsProvider();
    provider.setProperty("os.name", "windows");
    // APPDATA is intentionally not set, so getEnv("APPDATA") returns null

    UncheckedIOException thrown =
        assertThrows(
            UncheckedIOException.class,
            () -> GoogleAuthUtils.getWellKnownCredentialsFile(provider));
    assertTrue(thrown.getCause() instanceof FileNotFoundException);
    assertTrue(thrown.getCause().getMessage().contains("APPDATA"));
  }

  @Test
  void getWellKnownCredentialsPath_correct() {
    DefaultCredentialsProvider provider =
        new DefaultCredentialsProviderTest.TestDefaultCredentialsProvider();
    // since the TestDefaultCredentialsProvider properties and envs are not set,
    // the base folder will be an empty string using.
    File homeDir = new File("");
    File configDir = new File(homeDir, ".config");
    File cloudConfigDir = new File(configDir, DefaultCredentialsProvider.CLOUDSDK_CONFIG_DIRECTORY);
    File wellKnownFile =
        new File(cloudConfigDir, DefaultCredentialsProvider.WELL_KNOWN_CREDENTIALS_FILE);

    String obtainedPath = GoogleAuthUtils.getWellKnownCredentialsPath(provider);

    assertNotNull(obtainedPath);
    assertEquals(obtainedPath, wellKnownFile.getAbsolutePath());
  }
}