#3291

- added test cases

src/test/groovy/au/org/ala/merit/SearchServiceSpec.groovy

@@ -1,9 +1,9 @@
 package au.org.ala.merit
 
 import au.org.ala.merit.hub.HubSettings
-import grails.core.GrailsApplication
 import grails.testing.spring.AutowiredTest
 import org.apache.http.HttpStatus
+import org.joda.time.DateTimeZone
 import spock.lang.Specification
 
 class SearchServiceSpec extends Specification implements AutowiredTest{
@@ -80,6 +80,29 @@ class SearchServiceSpec extends Specification implements AutowiredTest{
         result == true
     }
 
+    def "getIsoDateFromClientDate with various timezones"() {
+        expect: "The correct ISO date is returned for each date and time zone"
+        service.getIsoDateFromClientDate(clientDate, timeZone) == expectedIsoDate
+
+        where:
+        clientDate                | timeZone                               | expectedIsoDate
+        "2024-09-10"     | DateTimeZone.forID("Australia/Sydney") | "2024-09-09T14:00:00Z"
+        "2024-09-10"     | DateTimeZone.forID("Australia/Perth") | "2024-09-09T16:00:00Z"
+        "2024-09-10"     | DateTimeZone.forID("Australia/Darwin")    | "2024-09-09T14:30:00Z"
+    }
+
+    def "getIsoDateFromClientDate throws exception for invalid input"() {
+        when: "Invalid input is passed to the method"
+        service.getIsoDateFromClientDate(clientDate, timeZone)
+
+        then: "An IllegalArgumentException is thrown"
+        thrown(IllegalArgumentException)
+
+        where: "Different invalid inputs are provided"
+        clientDate                | timeZone
+        "invalid-date-format"     | DateTimeZone.forID("Australia/Sydney")
+    }
+
     private List stubGeoReponseFromCoordinateList(List coords) {
         List results = new ArrayList(coords.size())
         coords.each { List coord ->