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Better parameterised tests for JUnit
package junitparams.internal;
import java.beans.PropertyEditor;
import java.beans.PropertyEditorManager;
import java.lang.annotation.Annotation;
import java.lang.reflect.Array;
import java.math.BigDecimal;
import org.junit.runner.Description;
import org.junit.runners.model.FrameworkMethod;
import org.junit.runners.model.Statement;
import junitparams.converters.ConversionFailedException;
import junitparams.converters.ConvertParam;
import junitparams.converters.ParamAnnotation;
import junitparams.converters.ParamConverter;
/**
* JUnit invoker for parameterised test methods
*
* @author Pawel Lipinski
*/
public class InvokeParameterisedMethod extends Statement {
private final Object[] params;
private final FrameworkMethod testMethod;
private final Object testClass;
private final String uniqueMethodId;
public InvokeParameterisedMethod(FrameworkMethod testMethod, Object testClass, Object params, int paramSetIdx) {
this.testMethod = testMethod;
this.testClass = testClass;
this.uniqueMethodId = Utils.uniqueMethodId(paramSetIdx - 1, params, testMethod.getName());
try {
if (params instanceof String)
this.params = castParamsFromString((String) params);
else {
this.params = castParamsFromObjects(params);
}
} catch (ConversionFailedException e) {
throw new RuntimeException(e);
}
}
private Object[] castParamsFromString(String params) throws ConversionFailedException {
Object[] columns = null;
try {
columns = Utils.splitAtCommaOrPipe(params);
columns = castParamsUsingConverters(columns);
} catch (RuntimeException e) {
new IllegalArgumentException("Cannot parse parameters. Did you use ',' or '|' as column separator? "
+ params, e).printStackTrace();
}
return columns;
}
private Object[] castParamsFromObjects(Object params) throws ConversionFailedException {
Object[] paramset = Utils.safelyCastParamsToArray(params);
try {
return castParamsUsingConverters(paramset);
} catch (ConversionFailedException e) {
throw e;
} catch (Exception e) {
Class[] typesOfParameters = createArrayOfTypesOf(paramset);
Object resultParam = createObjectOfExpectedTypeBasedOnParams(paramset, typesOfParameters);
return new Object[]{resultParam};
}
}
private Object createObjectOfExpectedTypeBasedOnParams(Object[] paramset, Class[] typesOfParameters) {
Object resultParam;
try {
if (testMethod.getMethod().getParameterTypes()[0].isArray()) {
resultParam = Array.newInstance(typesOfParameters[0], paramset.length);
for (int i = 0; i < paramset.length; i++) {
((Object[]) resultParam)[i] = paramset[i];
}
} else {
resultParam = testMethod.getMethod().getParameterTypes()[0].getConstructor(typesOfParameters).newInstance(paramset);
}
} catch (Exception e) {
throw new IllegalStateException("While trying to create object of class " + testMethod.getMethod().getParameterTypes()[0]
+ " could not find constructor with arguments matching (type-wise) the ones given in parameters.", e);
}
return resultParam;
}
private Class[] createArrayOfTypesOf(Object[] paramset) {
Class[] parametersBasedOnValues = new Class[paramset.length];
for (int i = 0; i < paramset.length; i++) {
parametersBasedOnValues[i] = paramset[i].getClass();
}
return parametersBasedOnValues;
}
private Object[] castParamsUsingConverters(Object[] columns) throws ConversionFailedException {
Class[] expectedParameterTypes = testMethod.getMethod().getParameterTypes();
if (testMethodParamsHasVarargs(columns, expectedParameterTypes)) {
columns = columnsWithVarargs(columns, expectedParameterTypes);
}
Annotation[][] parameterAnnotations = testMethod.getMethod().getParameterAnnotations();
verifySameSizeOfArrays(columns, expectedParameterTypes);
columns = castAllParametersToProperTypes(columns, expectedParameterTypes, parameterAnnotations);
return columns;
}
private Object[] columnsWithVarargs(Object[] columns, Class[] expectedParameterTypes) {
Object[] allParameters = standardParameters(columns, expectedParameterTypes);
allParameters[allParameters.length - 1] = varargsParameters(columns, expectedParameterTypes);
return allParameters;
}
private Object[] varargsParameters(Object[] columns, Class[] expectedParameterTypes) {
Class varArgType = expectedParameterTypes[expectedParameterTypes.length - 1].getComponentType();
Object[] varArgsParameters = (Object[]) Array.newInstance(varArgType, columns.length - expectedParameterTypes.length + 1);
for (int i = 0; i < varArgsParameters.length; i++) {
varArgsParameters[i] = columns[i + expectedParameterTypes.length - 1];
}
return varArgsParameters;
}
private Object[] standardParameters(Object[] columns, Class[] expectedParameterTypes) {
Object[] standardParameters = new Object[expectedParameterTypes.length];
for (int i = 0; i < standardParameters.length - 1; i++) {
standardParameters[i] = columns[i];
}
return standardParameters;
}
private boolean testMethodParamsHasVarargs(Object[] columns, Class[] expectedParameterTypes) {
int last = expectedParameterTypes.length - 1;
if (columns[last] == null) {
return false;
}
return expectedParameterTypes.length <= columns.length
&& expectedParameterTypes[last].isArray()
&& expectedParameterTypes[last].getComponentType().equals(columns[last].getClass());
}
private Object[] castAllParametersToProperTypes(Object[] columns, Class[] expectedParameterTypes,
Annotation[][] parameterAnnotations) throws ConversionFailedException {
Object[] result = new Object[columns.length];
for (int i = 0; i < columns.length; i++) {
if (parameterAnnotations[i].length == 0)
result[i] = castParameterDirectly(columns[i], expectedParameterTypes[i]);
else
result[i] = castParameterUsingConverter(columns[i], parameterAnnotations[i]);
}
return result;
}
private Object castParameterUsingConverter(Object param, Annotation[] annotations) throws ConversionFailedException {
for (Annotation annotation : annotations) {
if (ParamAnnotation.matches(annotation)) {
return ParamAnnotation.convert(annotation, param);
}
if (annotation.annotationType().isAssignableFrom(ConvertParam.class)) {
Class> converterClass = ((ConvertParam) annotation).value();
String options = ((ConvertParam) annotation).options();
try {
return converterClass.newInstance().convert(param, options);
} catch (ConversionFailedException e) {
throw e;
} catch (Exception e) {
throw new RuntimeException("Your ParamConverter class must have a public no-arg constructor!", e);
}
}
}
return param;
}
@SuppressWarnings("unchecked")
private Object castParameterDirectly(Object object, Class clazz) {
if (object == null || clazz.isInstance(object) || (!(object instanceof String) && clazz.isPrimitive()))
return object;
if (clazz.isEnum())
return (Enum.valueOf(clazz, (String) object));
if (clazz.isAssignableFrom(String.class))
return object.toString();
if (clazz.isAssignableFrom(Class.class))
try {
return Class.forName((String) object);
} catch (ClassNotFoundException e) {
throw new IllegalArgumentException("Parameter class (" + object + ") not found", e);
}
if (clazz.isAssignableFrom(Integer.TYPE) || clazz.isAssignableFrom(Integer.class))
return Integer.parseInt((String) object);
if (clazz.isAssignableFrom(Short.TYPE) || clazz.isAssignableFrom(Short.class))
return Short.parseShort((String) object);
if (clazz.isAssignableFrom(Long.TYPE) || clazz.isAssignableFrom(Long.class))
return Long.parseLong((String) object);
if (clazz.isAssignableFrom(Float.TYPE) || clazz.isAssignableFrom(Float.class))
return Float.parseFloat((String) object);
if (clazz.isAssignableFrom(Double.TYPE) || clazz.isAssignableFrom(Double.class))
return Double.parseDouble((String) object);
if (clazz.isAssignableFrom(Boolean.TYPE) || clazz.isAssignableFrom(Boolean.class))
return Boolean.parseBoolean((String) object);
if (clazz.isAssignableFrom(Character.TYPE) || clazz.isAssignableFrom(Character.class))
return object.toString().charAt(0);
if (clazz.isAssignableFrom(Byte.TYPE) || clazz.isAssignableFrom(Byte.class))
return Byte.parseByte((String) object);
if (clazz.isAssignableFrom(BigDecimal.class))
return new BigDecimal((String) object);
PropertyEditor editor = PropertyEditorManager.findEditor(clazz);
if (editor != null) {
editor.setAsText((String) object);
return editor.getValue();
}
throw new IllegalArgumentException("Parameter type (" + clazz.getName() + ") cannot be handled!" +
" Only primitive types, BigDecimals and Strings can be used.");
}
private void verifySameSizeOfArrays(Object[] columns, Class[] parameterTypes) {
if (parameterTypes.length != columns.length)
throw new IllegalArgumentException(
"Number of parameters inside @Parameters annotation doesn't match the number of test method parameters.\nThere are "
+ columns.length + " parameters in annotation, while there's " + parameterTypes.length + " parameters in the "
+ testMethod.getName() + " method.");
}
boolean matchesDescription(Description description) {
return description.hashCode() == uniqueMethodId.hashCode();
}
@Override
public void evaluate() throws Throwable {
testMethod.invokeExplosively(testClass, params == null ? new Object[]{params} : params);
}
}
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