Add extensions data tests

tests/cases/extensions.yaml

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+tests:
+  # https://www.hl7.org/fhir/fhirpath.html#types
+  - 'group: Extension and id for primitive types':
+
+    - desc: '** id for primitive type'
+      expression: Functions.attrtrue.id = 'someid'
+      result:
+        - true
+
+    - desc: '** expression with extension for primitive type 1'
+      inputfile: patient-example.json
+      expression: Patient.birthDate.extension.where(url = '').empty()
+      result:
+        - true
+
+    - desc: '** expression with extension for primitive type 2'
+      inputfile: patient-example.json
+      expression: >-
+        Patient.birthDate.extension
+        .where(url = 'http://hl7.org/fhir/StructureDefinition/patient-birthTime')
+        .valueDateTime.toDateTime() = @1974-12-25T14:35:45-05:00
+      result:
+        - true
+
+    - desc: '** expression with extension for primitive type 3'
+      inputfile: patient-example.json
+      model: r4
+      expression: >-
+        Patient.birthDate.extension
+        .where(url = 'http://hl7.org/fhir/StructureDefinition/patient-birthTime')
+        .value = @1974-12-25T14:35:45-05:00
+      result:
+        - true
+
+    # https://www.hl7.org/fhir/fhirpath.html#functions
+  - 'group: Additional functions':
+    - desc: 'extension(url : string) : collection'
+
+    # If the url is empty ({ }), the result is empty.
+    - desc: '** empty url'
+      inputfile: patient-example.json
+      expression: Patient.birthDate.extension('').empty()
+      result:
+        - true
+
+    # If the input collection is empty ({ }), the result is empty.
+    - desc: '** empty input collection'
+      inputfile: patient-example.json
+      expression: >-
+        Patient.birthDate1
+        .extension('http://hl7.org/fhir/StructureDefinition/patient-birthTime').empty()
+      result:
+        - true
+
+    - desc: '** expression with extension() for primitive type (without using FHIR model data)'
+      inputfile: patient-example.json
+      expression: >-
+        Patient.birthDate.extension('http://hl7.org/fhir/StructureDefinition/patient-birthTime')
+        .valueDateTime.toDateTime() = @1974-12-25T14:35:45-05:00
+      result:
+        - true
+
+    - desc: '** expression with extension() for primitive type (without using FHIR model data) when only extension is present'
+      inputfile: patient-example-2.json
+      expression: >-
+        Patient.communication.preferred.extension('test').exists()
+      result:
+        - true
+
+    - desc: '** expression with extension() for primitive type (using FHIR model data) when only extension is present'
+      inputfile: patient-example-2.json
+      model: r4
+      expression: >-
+        Patient.communication.preferred.extension('test').value.id
+      result:
+        - testing
+
+    - desc: '** expression with extension() for primitive type (using FHIR model data)'
+      inputfile: patient-example.json
+      model: r4
+      expression: >-
+        Patient.birthDate.extension('http://hl7.org/fhir/StructureDefinition/patient-birthTime')
+        .value = @1974-12-25T14:35:45-05:00
+      result:
+        - true
+
+    - desc: '** value of extension of extension (using FHIR model data)'
+      model: r4
+      expression: Functions.attrtrue.extension('url1').extension('url2').value = 'someuri'
+      result:
+        - true
+
+    - desc: '** id of extension of extension'
+      expression: Functions.attrtrue.extension('url1').extension('url2').id = 'someid2'
+      result:
+        - true
+
+subject:
+  resourceType: Functions
+  attrtrue: true
+  _attrtrue:
+    id: someid
+    extension:
+      - url: url1
+        extension:
+          - url: url2
+            id: someid2
+            valueUri: someuri

tests/resources/patient-example-2.json

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+{
+  "resourceType": "Patient",
+  "communication": [
+    {
+      "language": {
+        "coding": [
+          {
+            "system": "urn:ietf:bcp:47",
+            "code": "nl",
+            "display": "Dutch"
+          }
+        ]
+      },
+      "_preferred": {
+        "extension": [
+          {
+            "url": "test",
+            "_valueString": {
+              "id": "testing"
+            }
+          }
+        ]
+      }
+    }
+  ]
+}