Update.

test/sysinfo/cpu_count.wren

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+// retoor <retoor@molodetz.nl>
+
+import "sysinfo" for SysInfo
+
+var count = SysInfo.cpuCount
+System.print(count is Num) // expect: true
+System.print(count > 0) // expect: true

test/sysinfo/cpu_info.wren

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+// retoor <retoor@molodetz.nl>
+
+import "sysinfo" for SysInfo
+
+var cpus = SysInfo.cpuInfo
+System.print(cpus is List) // expect: true
+System.print(cpus.count > 0) // expect: true
+
+var cpu = cpus[0]
+System.print(cpu is Map) // expect: true
+System.print(cpu.containsKey("model")) // expect: true
+System.print(cpu.containsKey("speed")) // expect: true
+System.print(cpu.containsKey("times")) // expect: true
+
+var times = cpu["times"]
+System.print(times is Map) // expect: true
+System.print(times.containsKey("user")) // expect: true
+System.print(times.containsKey("sys")) // expect: true
+System.print(times.containsKey("idle")) // expect: true

test/sysinfo/hostname.wren

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+// retoor <retoor@molodetz.nl>
+
+import "sysinfo" for SysInfo
+
+var hostname = SysInfo.hostname
+System.print(hostname is String) // expect: true
+System.print(hostname.count > 0) // expect: true

test/sysinfo/hrtime.wren

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+// retoor <retoor@molodetz.nl>
+
+import "sysinfo" for SysInfo
+
+var t1 = SysInfo.hrtime
+var t2 = SysInfo.hrtime
+System.print(t1 is Num) // expect: true
+System.print(t2 is Num) // expect: true
+System.print(t2 >= t1) // expect: true

test/sysinfo/load_average.wren

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+// retoor <retoor@molodetz.nl>
+
+import "sysinfo" for SysInfo
+
+var load = SysInfo.loadAverage
+System.print(load is List) // expect: true
+System.print(load.count) // expect: 3
+System.print(load[0] is Num) // expect: true
+System.print(load[1] is Num) // expect: true
+System.print(load[2] is Num) // expect: true

test/sysinfo/memory.wren

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+// retoor <retoor@molodetz.nl>
+
+import "sysinfo" for SysInfo
+
+var total = SysInfo.totalMemory
+var free = SysInfo.freeMemory
+var resident = SysInfo.residentMemory
+
+System.print(total is Num) // expect: true
+System.print(free is Num) // expect: true
+System.print(resident is Num) // expect: true
+
+System.print(total > 0) // expect: true
+System.print(free > 0) // expect: true
+System.print(resident > 0) // expect: true
+System.print(total >= free) // expect: true

test/sysinfo/network_interfaces.wren

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+// retoor <retoor@molodetz.nl>
+
+import "sysinfo" for SysInfo
+
+var interfaces = SysInfo.networkInterfaces
+System.print(interfaces is Map) // expect: true
+System.print(interfaces.count > 0) // expect: true
+
+for (name in interfaces.keys) {
+    var addrs = interfaces[name]
+    System.print(addrs is List) // expect: true
+
+    for (addr in addrs) {
+        System.print(addr is Map) // expect: true
+        System.print(addr.containsKey("family")) // expect: true
+        System.print(addr.containsKey("address")) // expect: true
+        System.print(addr.containsKey("internal")) // expect: true
+        System.print(addr.containsKey("netmask")) // expect: true
+        System.print(addr.containsKey("mac")) // expect: true
+        break
+    }
+    break
+}

test/sysinfo/uptime.wren

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+// retoor <retoor@molodetz.nl>
+
+import "sysinfo" for SysInfo
+
+var uptime = SysInfo.uptime
+System.print(uptime is Num) // expect: true
+System.print(uptime > 0) // expect: true