In this post, I am going to explain how to mock Static methods inside a class partially.
PowerMock class provides 'mockStaticPartial' method to mock the Static Methods partially.
Suppose if your class has 10 static methods, but you want to mock only 2 of the static methods, then by using 'mockStaticPartial' method, you can mock only those two static methods.
Suppose if your class has 10 static methods, but you want to mock only 2 of the static methods, then by using 'mockStaticPartial' method, you can mock only those two static methods.
public static synchronized void mockStaticPartial(Class> clazz, String... methodNames)
'clazz' represent the class that contains the static methods that should be mocked and 'methodNames' specifies the names of the methods that should be mocked.
Following step-by-step procedure explain, how to mock some static methods of a class.
Step 1: Prepare the class for testing
@RunWith(PowerMockRunner.class)
@PrepareForTest({ ProductInfo.class })
public class ProductInfoTest {
....
....
}
Step 2: By using ‘mockStaticPartial’ method of PowerMock class specify the methods to mock.
PowerMock.mockStaticPartial(ProductInfo.class, "getVersion");
Step 3: Set the expectation for mocked methods.
Version version = EasyMock.createMock(Version.class);
EasyMock.expect(version.getReleaseDate()).andReturn("DumyReleaseDate");
EasyMock.expect(version.getVersionNumber()).andReturn("001");
EasyMock.expect(ProductInfo.getVersion()).andReturn(version);
Step 4: Replay the expectations.
EasyMock.replay(version);
PowerMock.replayAll();
Following is the complete working application.
ProductInfo.java
package com.sample.tests;
public class ProductInfo {
private static String versionNumber = "17.1";
private static String releaseDate = "04-25-2017";
private static Version version = new Version(versionNumber, releaseDate);
public static String getProductName() {
return "Java Tutorial";
}
public static Version getVersion() {
return version;
}
public static String getSoftwareRequirements() {
StringBuilder builder = new StringBuilder();
return builder.append("Operating System").append(" : ").append("Windows").append("\n").append("RAM")
.append(" : ").append("4GB").toString();
}
}
Version.java
package com.sample.tests;
public class Version {
private String versionNumber;
private String releaseDate;
public Version(String versionNumber, String releaseDate) {
super();
this.versionNumber = versionNumber;
this.releaseDate = releaseDate;
}
public String getVersionNumber() {
return versionNumber;
}
public String getReleaseDate() {
return releaseDate;
}
public void setVersionNumber(String versionNumber) {
this.versionNumber = versionNumber;
}
public void setReleaseDate(String releaseDate) {
this.releaseDate = releaseDate;
}
}
ProductInfoTest.java
package com.sample.tests;
import static org.junit.Assert.*;
import org.easymock.EasyMock;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
import org.powermock.api.easymock.PowerMock;
@RunWith(PowerMockRunner.class)
@PrepareForTest({ ProductInfo.class })
public class ProductInfoTest {
@Test
public void testProductInfo() {
PowerMock.mockStaticPartial(ProductInfo.class, "getVersion");
Version version = EasyMock.createMock(Version.class);
EasyMock.expect(version.getReleaseDate()).andReturn("DumyReleaseDate");
EasyMock.expect(version.getVersionNumber()).andReturn("001");
EasyMock.expect(ProductInfo.getVersion()).andReturn(version);
EasyMock.replay(version);
PowerMock.replayAll();
String productName = ProductInfo.getProductName();
Version versionReturned = ProductInfo.getVersion();
assertEquals(versionReturned.getReleaseDate(), "DumyReleaseDate");
assertEquals(versionReturned.getVersionNumber(), "001");
assertEquals(productName, "Java Tutorial");
}
}
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This post first appeared on Java Tutorial : Blog To Learn Java Programming, please read the originial post: here
