David is king

^2-3 So David moved to Hebron, along with his two wives, Ahinoam of Jezreel and Abigail the widow of Nabal of Carmel. David’s men, along with their families, also went with him and made their home in and around Hebron.
^4-7 The citizens of Judah came to Hebron, and then and there made David king over the clans of Judah.

A report was brought to David that the men of Jabesh Gilead had given Saul a decent burial. David sent messengers to the men of Jabesh Gilead: “God bless you for this—for honoring your master, Saul, with a funeral. God honor you and be true to you—and I’ll do the same, matching your generous act of goodness. Strengthen your resolve and do what must be done. Your master, Saul, is dead. The citizens of Judah have made me their king.”

^8-11 In the meantime, Abner son of Ner, commander of Saul’s army, had taken Saul’s son Ish-Bosheth to Mahanaim and made him king over Gilead, over Asher, over Jezreel, over Ephraim, over Benjamin—king, as it turns out, over all Israel. Ish-Bosheth Saul’s son, was forty years old when he was made king over Israel. He lasted only two years. But the people of Judah stuck with David. David ruled the people of Judah from Hebron for seven and a half years.

The citizens made David king over Judah, just like that without any battle, without any "test". David then ruled Judah for 7.5 years. We see that after Saul died, the army commander declared kingship to be upon one of Saul's sons. This is where i am reminded of the verse: "man makes plans but God has the final say." indeed it is true. We can plan to have our careers, university and everything but if we do seek God's decision on anything, everything would be fruitless in the end because God has the final say. His word is final. If He says no to the course you are going means no, you wont get that course in the END. It is clear. Just like this: the commander made one of the sons king, but he did not seek God and in the end... The king failed and did not last. Only David who is made king over Judah lasted. He is the true heir to the kingship of Israel because God chose Him. How much have we seeked God in our decisions?