有抽取后的代码实例吗?
时间: 2024-03-18 21:41:48 浏览: 13
这里提供一个简单的例子来说明如何进行 case 抽取并生成相应的测试用例代码。
假设我们要对一个简单的模块进行测试,这个模块包含一个加法器,输入两个数,输出它们的和。我们需要对这个模块进行功能测试、时序测试和容错测试。
1. 功能测试:我们需要对加法器进行各种组合的测试,以测试加法器的计算能力。这些测试可以通过生成随机数,并将其输入到加法器中进行计算,然后比对加法器的输出结果和预期结果是否一致。测试用例代码示例如下:
```
task test_adder;
int a, b, c, expected;
initial begin
// test case 1: a=0, b=0
a = 0;
b = 0;
expected = 0;
c = adder(a, b);
if (c !== expected) $error("Test case 1 failed");
// test case 2: a=1, b=2
a = 1;
b = 2;
expected = 3;
c = adder(a, b);
if (c !== expected) $error("Test case 2 failed");
// test case 3: a=-2, b=3
a = -2;
b = 3;
expected = 1;
c = adder(a, b);
if (c !== expected) $error("Test case 3 failed");
// more test cases ...
end
endtask
```
2. 时序测试:我们需要测试加法器在不同的时序条件下的计算能力。这些测试可以通过设置不同的时钟频率和时序延迟,并对加法器进行计算和比对输出结果。测试用例代码示例如下:
```
task test_adder_timing;
int a, b, c, expected;
initial begin
// test case 1: 100 MHz clock, 2 ns delay
$timescale(1ns/100ps);
@(posedge clk);
a = 0;
b = 0;
expected = 0;
c = adder(a, b);
if (c !== expected) $error("Test case 1 failed");
// test case 2: 200 MHz clock, 1 ns delay
$timescale(1ns/100ps);
@(posedge clk);
a = 1;
b = 2;
expected = 3;
c = adder(a, b);
if (c !== expected) $error("Test case 2 failed");
// test case 3: 300 MHz clock, 0.5 ns delay
$timescale(1ns/100ps);
@(posedge clk);
a = -2;
b = 3;
expected = 1;
c = adder(a, b);
if (c !== expected) $error("Test case 3 failed");
// more test cases ...
end
endtask
```
3. 容错测试:我们需要测试加法器在不同的异常情况下的容错能力。这些测试可以通过模拟不同的异常情况,如电压波动、温度变化和信号干扰等,对加法器进行计算和比对输出结果。测试用例代码示例如下:
```
task test_adder_fault;
int a, b, c, expected;
initial begin
// test case 1: voltage fluctuation
a = 0;
b = 0;
expected = 0;
// simulate voltage fluctuation
vdd = 1.0;
@(posedge clk);
vdd = 0.9;
@(posedge clk);
vdd = 1.1;
@(posedge clk);
c = adder(a, b);
if (c !== expected) $error("Test case 1 failed");
// test case 2: temperature change
a = 1;
b = 2;
expected = 3;
// simulate temperature change
temp = 25;
@(posedge clk);
temp = 30;
@(posedge clk);
temp = 20;
@(posedge clk);
c = adder(a, b);
if (c !== expected) $error("Test case 2 failed");
// test case 3: signal interference
a = -2;
b = 3;
expected = 1;
// simulate signal interference
@(posedge clk);
@(posedge clk);
@(posedge clk);
@(posedge clk);
@(posedge clk);
@(posedge clk);
@(posedge clk);
@(posedge clk);
c = adder(a, b);
if (c !== expected) $error("Test case 3 failed");
// more test cases ...
end
endtask
```
以上是一个简单的 case 抽取和测试用例代码生成的示例。实际的 case 抽取和测试用例设计需要根据具体的验证需求和测试目标进行细化和优化。