Setting the Range of Values

You can constrain the range of automatically generated values using the @Min and @Max annotations. These let you define minimum and maximum bounds for numeric parameters, ensuring that generated values fall within a specified range.

To apply a range, annotate the parameter with @Min and/or @Max as needed.

Here's an example:

Java

@Test
@AutoParams
void testMethod(@Min(1) @Max(10) int value) {
    assertTrue(value >= 1);
    assertTrue(value <= 10);
}

Kotlin

@Test
@AutoKotlinParams
fun testMethod(@Min(1) @Max(10) value: Int) {
    assertTrue(value >= 1)
    assertTrue(value <= 10)
}

In this test, the value parameter will always be an integer between 1 and 10, inclusive.

The @Min and @Max annotations are compatible with the following types:

• byte
• java.lang.Byte
• short
• java.lang.Short
• int
• java.lang.Integer
• long
• java.lang.Long
• float
• java.lang.Float
• double
• java.lang.Double

By combining @Min and @Max with @AutoParams(or @AutoKotlinParams), you can strike a balance between randomness and control, making your parameterized tests more robust and predictable.