Remember Path when switching to commits or file search

The path gets remembered by a query parameter.
Using React state to remember the current path has two downsides.
First you would need to wrap the components in a context and store the current state there.
Second the remembered state gets lost by refreshing the state.
By using a query parameter those two downside get avoided.

Committed-by: Thomas Zerr<thomas.zerr@cloudogu.com>
Co-authored-by: Thomas Zerr<thomas.zerr@cloudogu.com>
Pushed-by: Thomas Zerr<thomas.zerr@cloudogu.com>

scm-ui/ui-api/src/urls.test.ts

@@ -24,7 +24,9 @@
 
 import {
   concat,
+  createPrevSourcePathQuery,
   getNamespaceAndPageFromMatch,
+  getPrevSourcePathFromLocation,
   getQueryStringFromLocation,
   getValueStringFromLocationByKey,
   withEndingSlash,
@@ -143,3 +145,32 @@ describe("tests for getValueStringFromLocationByKey", () => {
     expect(getValueStringFromLocationByKey(location, "namespace")).toBeUndefined();
   });
 });
+
+describe("tests for getPrevSourcePathFromLocation", () => {
+  it("should return the value string", () => {
+    const location = { search: "?prevSourcePath=src%2Fsub%25%2Ffile%26%252F.abc" };
+    expect(getPrevSourcePathFromLocation(location)).toBe("src/sub%/file&%2F.abc");
+  });
+
+  it("should return undefined, because query parameter is missing", () => {
+    const location = { search: "?q=abc" };
+    expect(getPrevSourcePathFromLocation(location)).toBeUndefined();
+  });
+
+  it("should return undefined, because query parameter is missing", () => {
+    const location = { search: "?q=abc" };
+    expect(getPrevSourcePathFromLocation(location)).toBeUndefined();
+  });
+});
+
+describe("tests for createPrevSourcePathQuery", () => {
+  it("should return empty string if file path is empty", () => {
+    const encodedPath = createPrevSourcePathQuery("");
+    expect(encodedPath).toBe("");
+  });
+
+  it("should return the encoded path as query parameter", () => {
+    const encodedPath = createPrevSourcePathQuery("src/sub%/file&%2F.abc");
+    expect(encodedPath).toBe("prevSourcePath=src%2Fsub%25%2Ffile%26%252F.abc");
+  });
+});