Added SystemInfo and FileSystems to query system and file system information, respectively.

src/test/groovy/net/rubygrapefruit/platform/FileSystemsTest.groovy

@@ -0,0 +1,15 @@
+package net.rubygrapefruit.platform
+
+import org.junit.Rule
+import org.junit.rules.TemporaryFolder
+import spock.lang.Specification
+
+class FileSystemsTest extends Specification {
+    @Rule TemporaryFolder tmpDir
+    final FileSystems fileSystems = Native.get(FileSystems.class)
+
+    def "can query filesystem details"() {
+        expect:
+        fileSystems.fileSystems.collect() { it.mountPoint }.containsAll(File.listRoots())
+    }
+}

src/test/groovy/net/rubygrapefruit/platform/SystemInfoTest.groovy

@@ -0,0 +1,17 @@
+package net.rubygrapefruit.platform
+
+import org.junit.Rule
+import org.junit.rules.TemporaryFolder
+import spock.lang.Specification
+
+class SystemInfoTest extends Specification {
+    @Rule TemporaryFolder tmpDir
+    final SystemInfo systemInfo = Native.get(SystemInfo.class)
+
+    def "can query OS details"() {
+        expect:
+        systemInfo.kernelName
+        systemInfo.kernelVersion
+        systemInfo.machineArchitecture
+    }
+}