Added tests for "input" and "output" class. Signed-off-by: Maciej Kurc <mkurc@antmicro.com>

diff --git a/tests/io/input/golden.model.xml b/tests/io/input/golden.model.xml
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+++ b/tests/io/input/golden.model.xml

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+<models xmlns:xi="http://www.w3.org/2001/XInclude">
+  <!--this file is intentionally left blank-->
+</models>

diff --git a/tests/io/input/golden.pb_type.xml b/tests/io/input/golden.pb_type.xml
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+++ b/tests/io/input/golden.pb_type.xml

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+<?xml version='1.0' encoding='utf-8'?>
+<pb_type xmlns:xi="http://www.w3.org/2001/XInclude" name="IPAD" num_pb="1">
+  <blif_model>.input</blif_model>
+  <output name="inpad" num_pins="1"/>
+</pb_type>

diff --git a/tests/io/input/ipad.sim.v b/tests/io/input/ipad.sim.v
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+++ b/tests/io/input/ipad.sim.v

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+(* CLASS="input" *)
+module IPAD(inpad);
+    output wire inpad;
+
+endmodule

diff --git a/tests/io/output/golden.model.xml b/tests/io/output/golden.model.xml
new file mode 100644
index 0000000..07a7652
--- /dev/null
+++ b/tests/io/output/golden.model.xml

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+<models xmlns:xi="http://www.w3.org/2001/XInclude">
+  <!--this file is intentionally left blank-->
+</models>

diff --git a/tests/io/output/golden.pb_type.xml b/tests/io/output/golden.pb_type.xml
new file mode 100644
index 0000000..437e760
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+++ b/tests/io/output/golden.pb_type.xml

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+<?xml version='1.0' encoding='utf-8'?>
+<pb_type xmlns:xi="http://www.w3.org/2001/XInclude" name="OPAD" num_pb="1">
+  <blif_model>.output</blif_model>
+  <input name="outpad" num_pins="1"/>
+</pb_type>

diff --git a/tests/io/output/opad.sim.v b/tests/io/output/opad.sim.v
new file mode 100644
index 0000000..9ce27e1
--- /dev/null
+++ b/tests/io/output/opad.sim.v

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+(* CLASS="output" *)
+module OPAD(outpad);
+    input  wire outpad;
+
+endmodule