1 files changed, 168 insertions, 0 deletions
diff --git a/test/console/completion/reducer.test.ts b/test/console/completion/reducer.test.ts
new file mode 100644
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+++ b/test/console/completion/reducer.test.ts
@@ -0,0 +1,168 @@
+import reducer, {
+  defaultState,
+  State,
+} from "../../../src/console/completion/reducer";
+import { expect } from "chai";
+import {
+  initCompletion,
+  selectNext,
+  selectPrev,
+  setCompletions,
+  setCompletionSource,
+} from "../../../src/console/completion/actions";
+import CompletionType from "../../../src/shared/CompletionType";
+
+describe("completion reducer", () => {
+  describe("initCompletion", () => {
+    it("initializes completions", () => {
+      const nextState = reducer(
+        defaultState,
+        initCompletion([CompletionType.Bookmarks, CompletionType.History])
+      );
+
+      expect(nextState.completionTypes).deep.equals([
+        CompletionType.Bookmarks,
+        CompletionType.History,
+      ]);
+    });
+  });
+
+  describe("setCompletionSource", () => {
+    it("sets a completion source", () => {
+      const nextState = reducer(defaultState, setCompletionSource("open "));
+
+      expect(nextState.completionSource).equals("open ");
+    });
+  });
+
+  describe("setCompletions", () => {
+    it("sets completions", () => {
+      const nextState = reducer(
+        defaultState,
+        setCompletions([
+          {
+            name: "Apple",
+            items: [{}, {}],
+          },
+          {
+            name: "Banana",
+            items: [{}],
+          },
+        ])
+      );
+
+      expect(nextState.completions).deep.equals([
+        {
+          name: "Apple",
+          items: [{}, {}],
+        },
+        {
+          name: "Banana",
+          items: [{}],
+        },
+      ]);
+    });
+  });
+
+  describe("selectNext", () => {
+    context("when no completion groups", () => {
+      it("does nothing", () => {
+        const nextState = reducer(defaultState, selectNext());
+        expect(nextState.select).equals(-1);
+      });
+    });
+
+    context("when no completion items", () => {
+      it("does nothing", () => {
+        const state = {
+          ...defaultState,
+          completions: [{ name: "apple", items: [] }],
+        };
+        const nextState = reducer(state, selectNext());
+        expect(nextState.select).equals(-1);
+      });
+    });
+
+    context("when completions exist", () => {
+      it("selects next selection", () => {
+        let state: State = {
+          ...defaultState,
+          select: -1,
+          completions: [
+            {
+              name: "Apple",
+              items: [{}, {}],
+            },
+            {
+              name: "Banana",
+              items: [{}],
+            },
+          ],
+        };
+
+        state = reducer(state, selectNext());
+        expect(state.select).equals(0);
+
+        state = reducer(state, selectNext());
+        expect(state.select).equals(1);
+
+        state = reducer(state, selectNext());
+        expect(state.select).equals(2);
+
+        state = reducer(state, selectNext());
+        expect(state.select).equals(-1);
+      });
+    });
+  });
+
+  describe("selectPrev", () => {
+    context("when no completion groups", () => {
+      it("does nothing", () => {
+        const nextState = reducer(defaultState, selectPrev());
+        expect(nextState.select).equals(-1);
+      });
+
+      context("when no completion items", () => {
+        it("does nothing", () => {
+          const state = {
+            ...defaultState,
+            completions: [{ name: "apple", items: [] }],
+          };
+          const nextState = reducer(state, selectPrev());
+          expect(nextState.select).equals(-1);
+        });
+      });
+    });
+
+    context("when completions exist", () => {
+      it("selects a previous completion", () => {
+        let state: State = {
+          ...defaultState,
+          select: -1,
+          completions: [
+            {
+              name: "Apple",
+              items: [{}, {}],
+            },
+            {
+              name: "Banana",
+              items: [{}],
+            },
+          ],
+        };
+
+        state = reducer(state, selectPrev());
+        expect(state).to.have.property("select", 2);
+
+        state = reducer(state, selectPrev());
+        expect(state).to.have.property("select", 1);
+
+        state = reducer(state, selectPrev());
+        expect(state).to.have.property("select", 0);
+
+        state = reducer(state, selectPrev());
+        expect(state).to.have.property("select", -1);
+      });
+    });
+  });
+});