test: project-scan — ClickHouse env var detection and DATABASE_URL scheme parsing

Add 4 tests for the ClickHouse env var detection added in PR #574 but never tested.
Update clearWarehouseEnvVars() helper to also clear CLICKHOUSE_* vars for test isolation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

https://claude.ai/code/session_014pS7RRkb53MH36pc6qhSBT

Author: claude

packages/opencode/test/tool/project-scan.test.ts

@@ -312,6 +312,8 @@ describe("detectEnvVars", () => {
       "PGHOST", "PGPORT", "PGDATABASE", "PGUSER", "PGPASSWORD", "DATABASE_URL",
       "MYSQL_HOST", "MYSQL_TCP_PORT", "MYSQL_DATABASE", "MYSQL_USER", "MYSQL_PASSWORD",
       "REDSHIFT_HOST", "REDSHIFT_PORT", "REDSHIFT_DATABASE", "REDSHIFT_USER", "REDSHIFT_PASSWORD",
+      "CLICKHOUSE_HOST", "CLICKHOUSE_URL", "CLICKHOUSE_PORT", "CLICKHOUSE_DB",
+      "CLICKHOUSE_DATABASE", "CLICKHOUSE_USER", "CLICKHOUSE_USERNAME", "CLICKHOUSE_PASSWORD",
     ]
     for (const v of vars) {
       delete process.env[v]
@@ -502,6 +504,62 @@ describe("detectEnvVars", () => {
     expect(rs!.config.user).toBe("admin")
   })
 
+  test("detects ClickHouse via CLICKHOUSE_HOST", async () => {
+    clearWarehouseEnvVars()
+    process.env.CLICKHOUSE_HOST = "clickhouse.example.com"
+    process.env.CLICKHOUSE_PORT = "8443"
+    process.env.CLICKHOUSE_DATABASE = "analytics"
+    process.env.CLICKHOUSE_USER = "default"
+    process.env.CLICKHOUSE_PASSWORD = "secret"
+
+    const result = await detectEnvVars()
+    const ch = result.find((r) => r.type === "clickhouse")
+    expect(ch).toBeDefined()
+    expect(ch!.name).toBe("env_clickhouse")
+    expect(ch!.source).toBe("env-var")
+    expect(ch!.signal).toBe("CLICKHOUSE_HOST")
+    expect(ch!.config.host).toBe("clickhouse.example.com")
+    expect(ch!.config.port).toBe("8443")
+    expect(ch!.config.database).toBe("analytics")
+    expect(ch!.config.user).toBe("default")
+    expect(ch!.config.password).toBe("***")
+  })
+
+  test("detects ClickHouse via CLICKHOUSE_URL", async () => {
+    clearWarehouseEnvVars()
+    process.env.CLICKHOUSE_URL = "https://clickhouse.example.com:8443"
+
+    const result = await detectEnvVars()
+    const ch = result.find((r) => r.type === "clickhouse")
+    expect(ch).toBeDefined()
+    expect(ch!.signal).toBe("CLICKHOUSE_URL")
+    expect(ch!.config.connection_string).toBe("***")
+  })
+
+  test("detects ClickHouse via DATABASE_URL with clickhouse scheme", async () => {
+    clearWarehouseEnvVars()
+    process.env.DATABASE_URL = "clickhouse://default:pass@clickhouse.example.com:8443/analytics"
+
+    const result = await detectEnvVars()
+    const ch = result.find((r) => r.type === "clickhouse")
+    expect(ch).toBeDefined()
+    expect(ch!.signal).toBe("DATABASE_URL")
+    expect(ch!.config.connection_string).toBe("***")
+  })
+
+  test("detects ClickHouse via DATABASE_URL with clickhouse+http and clickhouse+https schemes", async () => {
+    for (const scheme of ["clickhouse+http", "clickhouse+https"]) {
+      clearWarehouseEnvVars()
+      process.env.DATABASE_URL = `${scheme}://default:pass@clickhouse.example.com:8443/analytics`
+
+      const result = await detectEnvVars()
+      const ch = result.find((r) => r.type === "clickhouse")
+      expect(ch).toBeDefined()
+      expect(ch!.signal).toBe("DATABASE_URL")
+      expect(ch!.type).toBe("clickhouse")
+    }
+  })
+
   test("detects multiple warehouses simultaneously", async () => {
     clearWarehouseEnvVars()
     process.env.SNOWFLAKE_ACCOUNT = "sf_account"