Fix display of unfeasibility explanation

We were missing a check to make sure valuation had finished before
displaying the unfeasibility explanation

spec/models/budget/investment_spec.rb

@@ -263,7 +263,52 @@ describe Budget::Investment do
     end
   end
 
-  describe "by_admin" do
+  describe "#should_show_unfeasibility_explanation?" do
+    let(:budget) { create(:budget) }
+    let(:investment) do
+      create(:budget_investment, budget: budget,
+             unfeasibility_explanation: "because of reasons",
+             valuation_finished: true,
+             feasibility: "unfeasible")
+    end
+
+    it "returns true for unfeasible investments with unfeasibility explanation and valuation finished" do
+      Budget::Phase::PUBLISHED_PRICES_PHASES.each do |phase|
+        budget.update(phase: phase)
+
+        expect(investment.should_show_unfeasibility_explanation?).to eq(true)
+      end
+    end
+
+    it "returns false in valuation has not finished" do
+      investment.update(valuation_finished: false)
+      Budget::Phase::PUBLISHED_PRICES_PHASES.each do |phase|
+        budget.update(phase: phase)
+
+        expect(investment.should_show_unfeasibility_explanation?).to eq(false)
+      end
+    end
+
+    it "returns false if not unfeasible" do
+      investment.update(feasibility: "undecided")
+      Budget::Phase::PUBLISHED_PRICES_PHASES.each do |phase|
+        budget.update(phase: phase)
+
+        expect(investment.should_show_unfeasibility_explanation?).to eq(false)
+      end
+    end
+
+    it "returns false if unfeasibility explanation blank" do
+      investment.update(unfeasibility_explanation: "")
+      Budget::Phase::PUBLISHED_PRICES_PHASES.each do |phase|
+        budget.update(phase: phase)
+
+        expect(investment.should_show_unfeasibility_explanation?).to eq(false)
+      end
+    end
+  end
+
+  describe "#by_admin" do
     it "returns investments assigned to specific administrator" do
       investment1 = create(:budget_investment, administrator_id: 33)
       create(:budget_investment)