Express rules: test case for instance comparison

src/ifcopenshell-python/test/fixtures/rules/fail-font-IfcDescriptiveMeasure-large.ifc

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+ISO-10303-21;
+HEADER;
+FILE_DESCRIPTION(('ViewDefinition [CoordinationView]'),'2;1');
+FILE_NAME('','2023-02-05T12:05:57',(),(),'IfcOpenShell v0.7.0-07ee62eb9','IfcOpenShell v0.7.0-07ee62eb9','');
+FILE_SCHEMA(('IFC4'));
+ENDSEC;
+DATA;
+#1=IFCTEXTSTYLEFONTMODEL('Comic Sans',('Comic Sans'),$,$,$,IFCDESCRIPTIVEMEASURE('large'));
+ENDSEC;
+END-ISO-10303-21;

src/ifcopenshell-python/test/fixtures/rules/fail-font-IfcLengthMeasure--1.0.ifc

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+ISO-10303-21;
+HEADER;
+FILE_DESCRIPTION(('ViewDefinition [CoordinationView]'),'2;1');
+FILE_NAME('','2023-02-05T12:05:57',(),(),'IfcOpenShell v0.7.0-07ee62eb9','IfcOpenShell v0.7.0-07ee62eb9','');
+FILE_SCHEMA(('IFC4'));
+ENDSEC;
+DATA;
+#1=IFCTEXTSTYLEFONTMODEL('Comic Sans',('Comic Sans'),$,$,$,IFCLENGTHMEASURE(-1.));
+ENDSEC;
+END-ISO-10303-21;

src/ifcopenshell-python/test/fixtures/rules/generate_23.py

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+import ifcopenshell
+
+fns = [
+    (False, lambda f: f.createIfcLengthMeasure(-1.)),
+    (True, lambda f: f.createIfcLengthMeasure(1.)),
+    (True, lambda f: f.createIfcPositiveLengthMeasure(1.)),
+    (False, lambda f: f.createIfcDescriptiveMeasure('large'))
+]
+
+for valid, fn in fns:
+    f = ifcopenshell.file(schema="IFC4")
+    fs = fn(f)
+    f.createIfcTextStyleFontModel('Comic Sans', ('Comic Sans',), FontSize=fs)
+    f.write(f"{'pass' if valid else 'fail'}-font-{fs.is_a()}-{fs[0]}.ifc")

src/ifcopenshell-python/test/fixtures/rules/pass-font-IfcLengthMeasure-1.0.ifc

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+ISO-10303-21;
+HEADER;
+FILE_DESCRIPTION(('ViewDefinition [CoordinationView]'),'2;1');
+FILE_NAME('','2023-02-05T12:05:57',(),(),'IfcOpenShell v0.7.0-07ee62eb9','IfcOpenShell v0.7.0-07ee62eb9','');
+FILE_SCHEMA(('IFC4'));
+ENDSEC;
+DATA;
+#1=IFCTEXTSTYLEFONTMODEL('Comic Sans',('Comic Sans'),$,$,$,IFCLENGTHMEASURE(1.));
+ENDSEC;
+END-ISO-10303-21;

src/ifcopenshell-python/test/fixtures/rules/pass-font-IfcPositiveLengthMeasure-1.0.ifc

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+ISO-10303-21;
+HEADER;
+FILE_DESCRIPTION(('ViewDefinition [CoordinationView]'),'2;1');
+FILE_NAME('','2023-02-05T12:05:57',(),(),'IfcOpenShell v0.7.0-07ee62eb9','IfcOpenShell v0.7.0-07ee62eb9','');
+FILE_SCHEMA(('IFC4'));
+ENDSEC;
+DATA;
+#1=IFCTEXTSTYLEFONTMODEL('Comic Sans',('Comic Sans'),$,$,$,IFCPOSITIVELENGTHMEASURE(1.));
+ENDSEC;
+END-ISO-10303-21;