- Changed Native.get() to cache integration instances.

- Extracted DefaultSystemInfo out of a couple of separate places.

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

@@ -8,6 +8,11 @@ class FileSystemsTest extends Specification {
     @Rule TemporaryFolder tmpDir
     final FileSystems fileSystems = Native.get(FileSystems.class)
 
+    def "caches file systems instance"() {
+        expect:
+        Native.get(FileSystems.class) == fileSystems
+    }
+
     def "can query filesystem details"() {
         expect:
         fileSystems.fileSystems.collect() { it.mountPoint }.containsAll(File.listRoots())

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

@@ -11,6 +11,11 @@ class PosixFileTest extends Specification {
     @Rule TemporaryFolder tmpDir
     final PosixFile file = Native.get(PosixFile.class)
 
+    def "caches file instance"() {
+        expect:
+        Native.get(PosixFile.class) == file
+    }
+
     def "can set mode on a file"() {
         def testFile = tmpDir.newFile("test.txt")
 

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

@@ -8,6 +8,11 @@ class ProcessTest extends Specification {
     @Rule TemporaryFolder tmpDir
     final Process process = Native.get(Process.class)
 
+    def "caches process instance"() {
+        expect:
+        Native.get(Process.class) == process
+    }
+
     def "can get PID"() {
         expect:
         process.getProcessId() != 0

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

@@ -8,6 +8,11 @@ class SystemInfoTest extends Specification {
     @Rule TemporaryFolder tmpDir
     final SystemInfo systemInfo = Native.get(SystemInfo.class)
 
+    def "caches system info instance"() {
+        expect:
+        Native.get(SystemInfo.class) == systemInfo
+    }
+
     def "can query OS details"() {
         expect:
         systemInfo.kernelName

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

@@ -8,18 +8,23 @@ import spock.lang.IgnoreIf
 
 class TerminalsTest extends Specification {
     @Rule TemporaryFolder tmpDir
-    final Terminals terminal = Native.get(Terminals.class)
+    final Terminals terminals = Native.get(Terminals.class)
+
+    def "caches terminals instance"() {
+        expect:
+        Native.get(Terminals.class) == terminals
+    }
 
     def "can check if attached to terminal"() {
         expect:
-        !terminal.isTerminal(Terminals.Output.Stdout);
-        !terminal.isTerminal(Terminals.Output.Stderr);
+        !terminals.isTerminal(Terminals.Output.Stdout);
+        !terminals.isTerminal(Terminals.Output.Stderr);
     }
 
     @IgnoreIf({Platform.current().windows})
     def "cannot access posix terminal from a test"() {
         when:
-        terminal.getTerminal(Terminals.Output.Stdout)
+        terminals.getTerminal(Terminals.Output.Stdout)
 
         then:
         NativeException e = thrown()
@@ -29,7 +34,7 @@ class TerminalsTest extends Specification {
     @IgnoreIf({!Platform.current().windows})
     def "cannot access windows console from a test"() {
         when:
-        terminal.getTerminal(Terminals.Output.Stdout)
+        terminals.getTerminal(Terminals.Output.Stdout)
 
         then:
         NativeException e = thrown()