Test Combat.

client/src/components/combat/Combat.test.tsx

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+import { renderWithProviders } from "../../testutils";
+import Combat from "./Combat";
+import { LatLng } from "leaflet";
+
+const mockPolyline = jest.fn();
+const mockPolygon = jest.fn();
+jest.mock("react-leaflet", () => ({
+  Polyline: (props: any) => {
+    mockPolyline(props);
+  },
+  Polygon: (props: any) => {
+    mockPolygon(props);
+  },
+}));
+
+describe("Combat", () => {
+  describe("footprint", () => {
+    it("is not interactive", () => {
+      renderWithProviders(
+        <Combat
+          combat={{
+            id: "foo",
+            flight_position: null,
+            target_positions: null,
+            footprint: [[new LatLng(0, 0), new LatLng(0, 1), new LatLng(1, 0)]],
+          }}
+        />
+      );
+      expect(mockPolygon).toBeCalledWith(
+        expect.objectContaining({ interactive: false })
+      );
+    });
+
+    // Fails because we don't handle multi-poly combat footprints correctly.
+    it.skip("renders single polygons", () => {
+      const boundary = [new LatLng(0, 0), new LatLng(0, 1), new LatLng(1, 0)];
+      renderWithProviders(
+        <Combat
+          combat={{
+            id: "foo",
+            flight_position: null,
+            target_positions: null,
+            footprint: [boundary],
+          }}
+        />
+      );
+      expect(mockPolygon).toBeCalledWith(
+        expect.objectContaining({ positions: boundary })
+      );
+    });
+
+    // Fails because we don't handle multi-poly combat footprints correctly.
+    it.skip("renders multiple polygons", () => {
+      const boundary = [new LatLng(0, 0), new LatLng(0, 1), new LatLng(1, 0)];
+      renderWithProviders(
+        <Combat
+          combat={{
+            id: "foo",
+            flight_position: null,
+            target_positions: null,
+            footprint: [boundary, boundary],
+          }}
+        />
+      );
+      expect(mockPolygon).toBeCalledTimes(2);
+    });
+  });
+
+  describe("lines", () => {
+    it("is not interactive", () => {
+      renderWithProviders(
+        <Combat
+          combat={{
+            id: "foo",
+            flight_position: new LatLng(0, 0),
+            target_positions: [new LatLng(1, 0)],
+            footprint: null,
+          }}
+        />
+      );
+      expect(mockPolyline).toBeCalledWith(
+        expect.objectContaining({ interactive: false })
+      );
+    });
+
+    it("renders single line", () => {
+      renderWithProviders(
+        <Combat
+          combat={{
+            id: "foo",
+            flight_position: new LatLng(0, 0),
+            target_positions: [new LatLng(0, 1)],
+            footprint: null,
+          }}
+        />
+      );
+      expect(mockPolyline).toBeCalledWith(
+        expect.objectContaining({
+          positions: [new LatLng(0, 0), new LatLng(0, 1)],
+        })
+      );
+    });
+
+    it("renders multiple lines", () => {
+      renderWithProviders(
+        <Combat
+          combat={{
+            id: "foo",
+            flight_position: new LatLng(0, 0),
+            target_positions: [new LatLng(0, 1), new LatLng(1, 0)],
+            footprint: null,
+          }}
+        />
+      );
+      expect(mockPolyline).toBeCalledTimes(2);
+    });
+  });
+
+  it("renders nothing if no footprint or targets", () => {
+    const { container } = renderWithProviders(
+      <Combat
+        combat={{
+          id: "foo",
+          flight_position: new LatLng(0, 0),
+          target_positions: null,
+          footprint: null,
+        }}
+      />
+    );
+    expect(container).toBeEmptyDOMElement();
+  });
+});