Hi folks,
I developed a trigger for my production environment in the Eclipse IDE. When I go to save it to my environment, it shows an error that code coverage is 0%. I've developed a test class for this trigger, and when I run the test from the IDE, it shows test coverage for my trigger at 100% (0 lines not tested).

What gives? Is there another way to get my trigger to save onto my environment? I tried using the Development Console but that didn't work due to the 'Metadata can't be changed on an active environment' bug.

Any help is appreciated.

Trigger:

trigger Account_UpdateAccountInterestsList on Interest__c (after delete, after insert, after undelete, 
after update) {
	Interest__c[] interests;
    if (Trigger.isDelete) 
        interests = Trigger.old;
    else
        interests = Trigger.new;
	Set<ID> affected_accounts = new Set<ID>();
	Map<ID, List<String>> account_interests = new Map<ID, List<String>>();
	for(Interest__c interest: interests){
		affected_accounts.add(interest.Account__c);
		account_interests.put(interest.Account__c, new List<String>());
	}

	List<Interest__c> all_interests = [
		SELECT Id, Account__c, Interest__r.Name
		FROM Interest__c
		WHERE Account__c IN :affected_accounts
		ORDER BY Interest__r.Name
	];
	List<Account> accounts_to_update = [
		SELECT Id, Account_Interests_List__c
		FROM Account
		WHERE Id IN :affected_accounts
	];
	
	for(Interest__c interest: all_interests){
		account_interests.get(interest.Account__c).add(interest.Interest__r.Name + '\n');
	}
	for(Account account: accounts_to_update){
		account.Account_Interests_List__c = Util_TMCR.combineList(account_interests.get(account.Id));
	}
	
	update accounts_to_update;
}

Test class:

@isTest
private class TMCR_testAccountInterestList {
  /*
    Testing Account_UpdateAccountInterestsList trigger
  */
  static Account getAccount(){
    Util_TMCR_DataFactory.accounts account = new Util_TMCR_DataFactory.accounts();
    Account acc = [
      SELECT Id, Account_Interests_List__c
      FROM Account WHERE Name = :account.get('name')
    ];
    return acc;
  }
  static Interests__c addInterest(String name){
    Interests__c new_interest = new Interests__c(Name = name);
    insert new_interest;
    return new_interest;
  }
  static Interest__c addToAccount(Account acc, Interests__c interest){
    Interest__c acc_interest = new Interest__c(Interest__c = interest.Id, Account__c = acc.Id);
    insert acc_interest;
    return acc_interest;
  }
  
  @testSetup
  static void setup(){
    List<Interests__c> interests = new List<Interests__c>();
    List<Interest__c> account_interests = new List<Interest__c>();
    for(Integer i=0; i<3;i++){
      interests.add(addInterest('Interest' + i));
    }
    Util_TMCR_DataFactory.accounts account = new Util_TMCR_DataFactory.accounts();
    Account acc = account.generate();
    for(Interests__c interest: interests){
      account_interests.add(addToAccount(acc, interest));
    }
  }
  
    static testMethod void test_addInterest() {
    test.startTest();
    Account account = getAccount();
    Interests__c interest = addInterest('foo');
    Interest__c acc_interest = addToAccount(account, interest);
    test.stopTest();
    
    String concat = Util_TMCR.combineList(new List<String>{'foo', 'Interest0', 'Interest1', 'Interest2'});
    Account acc = getAccount();
    System.assertEquals(acc.Account_Interests_List__c, concat);
    }
    static testMethod void test_changeInterest() {
      test.startTest();
    Interests__c interest = addInterest('foo');
    Interest__c acc_interest = [SELECT Id, Interest__c from Interest__c WHERE Interest__r.Name = 'Interest0' LIMIT 1];
    acc_interest.Interest__c = interest.Id;
    update acc_interest;
      test.stopTest();
      List<String> mylist = new List<String>{'foo', 'Interest1', 'Interest2'};
      String concat = Util_TMCR.combineList(mylist);
      Account acc = getAccount();
      System.assertEquals(acc.Account_Interests_List__c, concat);
    }
    static testMethod void test_deleteInterest(){
      test.startTest();
    Interests__c interest = [SELECT Id, Name FROM Interests__c WHERE Name = 'Interest0' LIMIT 1];
    delete interest;
      test.stopTest();
      List<String> mylist = new List<String>{'Interest1', 'Interest2'};
      String concat = Util_TMCR.combineList(mylist);
      Account acc = getAccount();
      System.assertEquals(acc.Account_Interests_List__c, concat);
    }
    static testMethod void test_undeleteInterest(){
      test.startTest();
    Interests__c interest = [SELECT Id, Name FROM Interests__c WHERE Name = 'Interest0' LIMIT 1];
    delete interest;
    undelete interest;
      test.stopTest();
      List<String> mylist = new List<String>{'Interest0', 'Interest1', 'Interest2'};
      String concat = Util_TMCR.combineList(mylist);
      Account acc = getAccount();
      System.assertEquals(acc.Account_Interests_List__c, concat);
    }
}