I think I have the exact same issue as the one in this post. I have a test class with 2 existing methods, and when I added a third, it doesn't show up when running tests for the whole class. The class contains two other non-test helper methods. If I run just the test method itself, it shows up as terminated. Here is the log I got:
2020-02-14 09:56:35,255 [ 602814] DEBUG - ij.coverage.ApexCoverageEngine - Creating a new coverage suite for name = '********************** Coverage Results' and connection name = '**********************'.
2020-02-14 09:56:35,256 [ 602815] DEBUG - lij.coverage.ApexCoverageSuite - Created an Apex coverage suite with project name = Procom and connection name = **********************(MDAPI).
2020-02-14 09:56:35,301 [ 602860] DEBUG - .ApexUnitTestRunProcessHandler - Starting test run.
2020-02-14 09:56:35,301 [ 602860] DEBUG - .ApexUnitTestRunProcessHandler - Finding class declaration for TestLeadTrigger.
2020-02-14 09:56:35,302 [ 602861] DEBUG - .ApexUnitTestRunProcessHandler - Finding test methods in TestLeadTrigger.
2020-02-14 09:56:35,302 [ 602861] DEBUG - .ApexUnitTestRunProcessHandler - testConnectAccountInsert is a test method.
2020-02-14 09:56:35,302 [ 602861] DEBUG - .ApexUnitTestRunProcessHandler - testConnectAccountUpdate is a test method.
2020-02-14 09:56:35,302 [ 602861] DEBUG - .ApexUnitTestRunProcessHandler - getTestAccount is not a test method.
2020-02-14 09:56:35,302 [ 602861] DEBUG - .ApexUnitTestRunProcessHandler - getTestLead is not a test method.
2020-02-14 09:56:35,302 [ 602861] DEBUG - .ApexUnitTestRunProcessHandler - Found the following test methods for TestLeadTrigger: { TestLeadTrigger.testConnectAccountInsert()v, TestLeadTrigger.testConnectAccountUpdate()v }.
2020-02-14 09:56:35,302 [ 602861] DEBUG - .ApexUnitTestRunProcessHandler - Filtering by the configured test methods based on simple class name TestLeadTrigger: { testOpportunityRecordTypeSet }.
2020-02-14 09:56:35,302 [ 602861] DEBUG - .ApexUnitTestRunProcessHandler - testConnectAccountInsert is not a configured test method in test class TestLeadTrigger.
2020-02-14 09:56:35,302 [ 602861] DEBUG - .ApexUnitTestRunProcessHandler - testConnectAccountUpdate is not a configured test method in test class TestLeadTrigger.
2020-02-14 09:56:35,302 [ 602861] WARN - .ApexUnitTestRunProcessHandler - All test methods for TestLeadTrigger were filtered. No tests will be run.
2020-02-14 09:56:35,303 [ 602862] DEBUG - .ApexUnitTestRunProcessHandler - Creating a trace flag.
2020-02-14 09:56:35,995 [ 603554] INFO - .ApexUnitTestRunProcessHandler - Running unit tests synchronously.
2020-02-14 09:56:35,995 [ 603554] DEBUG - .ApexUnitTestRunProcessHandler - Starting the test run skipping coverage.
2020-02-14 09:56:35,995 [ 603554] DEBUG - .ApexUnitTestRunProcessHandler - Posting the following to runTestsSynchronous:
2020-02-14 09:56:35,995 [ 603554] DEBUG - .ApexUnitTestRunProcessHandler - {"tests":[],"skipCodeCoverage":true}
2020-02-14 09:56:36,141 [ 603700] WARN - .ApexUnitTestRunProcessHandler - Unexpected status code 403 returned.
2020-02-14 09:56:36,141 [ 603700] DEBUG - .ApexUnitTestRunProcessHandler - Finishing test run.
2020-02-14 09:56:48,040 [ 615599] INFO - rationStore.ComponentStoreImpl - Saving Module: 'dev'FacetManager took 17 ms
2020-02-14 09:57:09,630 [ 637189] INFO - j.ide.actions.RevealFileAction -
Exit code 1
Thank you in advance for your help.