Fix parallel test execution

Author: gesellix

api-client/src/main/java/de/gesellix/docker/authentication/AuthConfig.java

@@ -90,4 +90,17 @@ public boolean equals(Object o) {
   public int hashCode() {
     return Objects.hash(username, password, auth, email, serveraddress, identitytoken, registrytoken);
   }
+
+  @Override
+  public String toString() {
+    return "AuthConfig{" +
+        "username='" + username + '\'' +
+        ", password=_redacted_'" + '\'' +
+        ", auth=_redacted_'" + '\'' +
+        ", email='" + email + '\'' +
+        ", serveraddress='" + serveraddress + '\'' +
+        ", identitytoken=_redacted_'" + '\'' +
+        ", registrytoken=_redacted_'" + '\'' +
+        '}';
+  }
 }

api-client/src/main/java/de/gesellix/docker/engine/DockerConfigReader.java

@@ -1,7 +1,9 @@
 package de.gesellix.docker.engine;
 
 import com.squareup.moshi.Moshi;
+
 import okio.Okio;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 

api-client/src/test/groovy/de/gesellix/docker/authentication/AuthConfigReaderTest.groovy

@@ -38,6 +38,8 @@ class AuthConfigReaderTest extends Specification {
     cleanup:
     if (oldDockerConfig) {
       System.setProperty("docker.config", oldDockerConfig)
+    } else {
+      System.clearProperty("docker.config")
     }
   }
 
@@ -59,6 +61,8 @@ class AuthConfigReaderTest extends Specification {
     cleanup:
     if (oldDockerConfig) {
       System.setProperty("docker.config", oldDockerConfig)
+    } else {
+      System.clearProperty("docker.config")
     }
   }
 
@@ -141,6 +145,8 @@ class AuthConfigReaderTest extends Specification {
     cleanup:
     if (oldDockerConfig) {
       System.setProperty("docker.config", oldDockerConfig)
+    } else {
+      System.clearProperty("docker.config")
     }
   }
 
@@ -165,6 +171,8 @@ class AuthConfigReaderTest extends Specification {
     cleanup:
     if (oldDockerConfig) {
       System.setProperty("docker.config", oldDockerConfig)
+    } else {
+      System.clearProperty("docker.config")
     }
   }
 }

api-client/src/test/groovy/de/gesellix/docker/engine/DockerEnvTest.groovy

@@ -40,6 +40,8 @@ class DockerEnvTest extends Specification {
     cleanup:
     if (oldDockerConfigDir) {
       System.setProperty("docker.config", oldDockerConfigDir)
+    } else {
+      System.clearProperty("docker.config")
     }
   }
 
@@ -66,6 +68,8 @@ class DockerEnvTest extends Specification {
     cleanup:
     if (oldDockerConfig) {
       System.setProperty("docker.config", oldDockerConfig)
+    } else {
+      System.clearProperty("docker.config")
     }
   }
 }