add bunTask unit test

src/test/groovy/com/github/gradle/node/bun/task/BunTaskTest.groovy

@@ -0,0 +1,69 @@
+package com.github.gradle.node.bun.task
+
+import com.github.gradle.node.pnpm.task.PnpmTask
+import com.github.gradle.node.task.AbstractTaskTest
+import com.github.gradle.node.util.PlatformHelperKt
+
+class BunTaskTest extends AbstractTaskTest {
+    def "exec bun task"() {
+        given:
+        nodeExtension.resolvedPlatform.set(PlatformHelperKt.parsePlatform("Linux", "x86_64", {}))
+
+        def task = project.tasks.create('simple', BunTask)
+        mockProjectApiHelperExec(task)
+        task.args.set(['a', 'b'])
+        task.environment.set(['a': '1'])
+        task.ignoreExitValue.set(true)
+        task.workingDir.set(projectDir)
+
+        when:
+        project.evaluate()
+        task.exec()
+
+        then:
+        task.args.set(['a', 'b'])
+        1 * execSpec.setIgnoreExitValue(true)
+        1 * execSpec.setEnvironment({ it['a'] == '1' && containsPath(it) })
+        1 * execSpec.setExecutable('bun')
+        1 * execSpec.setArgs(['a', 'b'])
+    }
+
+    def "exec bun task (windows)"() {
+        given:
+        nodeExtension.resolvedPlatform.set(PlatformHelperKt.parsePlatform("Windows", "x86_64", {}))
+
+        def task = project.tasks.create('simple', BunTask)
+        mockProjectApiHelperExec(task)
+        task.args.set(['a', 'b'])
+        task.environment.set(['a': '1'])
+        task.ignoreExitValue.set(true)
+        task.workingDir.set(projectDir)
+
+        when:
+        project.evaluate()
+        task.exec()
+
+        then:
+        task.args.get() == ['a', 'b']
+        1 * execSpec.setIgnoreExitValue(true)
+        1 * execSpec.setEnvironment({ it['a'] == '1' && containsPath(it) })
+        1 * execSpec.setExecutable('bun.cmd')
+        1 * execSpec.setArgs(['a', 'b'])
+    }
+
+    def "exec bun task (download)"() {
+        given:
+        nodeExtension.resolvedPlatform.set(PlatformHelperKt.parsePlatform("Linux", "x86_64", {}))
+        nodeExtension.download.set(true)
+
+        def task = project.tasks.create('simple', PnpmTask)
+        mockProjectApiHelperExec(task)
+
+        when:
+        project.evaluate()
+        task.exec()
+
+        then:
+        1 * execSpec.setIgnoreExitValue(false)
+    }
+}