test: project-scan — ClickHouse env var detection coverage

detectEnvVars() gained ClickHouse support (CLICKHOUSE_HOST, CLICKHOUSE_URL,
DATABASE_URL clickhouse:// schemes) in #574 but had zero test coverage,
risking silent regressions for ClickHouse users relying on auto-detection.

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

https://claude.ai/code/session_01VG1sv78kEKb4PGTmhDwNkN

Author: claude

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

@@ -312,6 +312,9 @@ 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]
@@ -542,6 +545,71 @@ describe("detectEnvVars", () => {
     }
   })
 
+  test("detects ClickHouse via CLICKHOUSE_HOST", async () => {
+    clearWarehouseEnvVars()
+    process.env.CLICKHOUSE_HOST = "clickhouse.example.com"
+    process.env.CLICKHOUSE_PORT = "8123"
+    process.env.CLICKHOUSE_DB = "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("8123")
+    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://user:pass@host:8123/db"
+
+    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+https scheme", async () => {
+    clearWarehouseEnvVars()
+    process.env.DATABASE_URL = "clickhouse+https://user:pass@host:8443/db"
+
+    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("CLICKHOUSE_HOST takes precedence over DATABASE_URL clickhouse scheme", async () => {
+    clearWarehouseEnvVars()
+    process.env.CLICKHOUSE_HOST = "ch-primary.local"
+    process.env.DATABASE_URL = "clickhouse://user:pass@ch-secondary.local:8123/db"
+
+    const result = await detectEnvVars()
+    const chConns = result.filter((r) => r.type === "clickhouse")
+    expect(chConns.length).toBe(1)
+    expect(chConns[0].signal).toBe("CLICKHOUSE_HOST")
+  })
+
   test("connection names follow env_ prefix convention", async () => {
     clearWarehouseEnvVars()
     process.env.SNOWFLAKE_ACCOUNT = "acct"